added Revit 2022 SDK minus except *rvt and *rfa

2026-08-29 08:12:56 +00:00 · 2021-04-20 11:36:21 +02:00
parent 1133a82dc5
commit 7e327986e8
3034 changed files with 1245318 additions and 0 deletions
@@ -0,0 +1,183 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc. 
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable. 
+//
+
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using Autodesk.Revit;
+using Autodesk.Revit.DB;
+using Autodesk.Revit.UI;
+
+namespace Revit.SDK.Samples.LevelsProperty.CS
+{
+    /// <summary>
+    /// Implements the Revit add-in interface IExternalCommand
+    /// </summary>
+    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
+    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
+    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
+    public class Command : IExternalCommand
+    {
+        #region GetDatum
+
+        /// <summary>
+        /// Implement this method as an external command for Revit.
+        /// </summary>
+        /// <param name="revit">An object that is passed to the external application 
+        /// which contains data related to the command, 
+        /// such as the application object and active view.</param>
+        /// <param name="message">A message that can be set by the external application 
+        /// which will be displayed if a failure or cancellation is returned by 
+        /// the external command.</param>
+        /// <param name="elements">A set of elements to which the external application 
+        /// can add elements that are to be highlighted in case of failure or cancellation.</param>
+        /// <returns>Return the status of the external command. 
+        /// A result of Succeeded means that the API external method functioned as expected. 
+        /// Cancelled can be used to signify that the user cancelled the external operation 
+        /// at some point. Failure should be returned if the application is unable to proceed with 
+        /// the operation.</returns>
+        public Autodesk.Revit.UI.Result Execute(ExternalCommandData revit, ref String message, Autodesk.Revit.DB.ElementSet elements)
+        {
+            m_revit = revit;
+            UnitTypeId = m_revit.Application.ActiveUIDocument.Document.GetUnits().GetFormatOptions(Autodesk.Revit.DB.SpecTypeId.Length).GetUnitTypeId();
+            Transaction documentTransaction = new Transaction(revit.Application.ActiveUIDocument.Document, "Document");
+            documentTransaction.Start();
+            try
+            {
+                //Get every level by iterating through all elements
+                systemLevelsDatum = new List<LevelsDataSource>();
+                FilteredElementCollector collector = new FilteredElementCollector(m_revit.Application.ActiveUIDocument.Document);
+                ICollection<Element> collection = collector.OfClass(typeof(Level)).ToElements();
+                foreach (Element element in collection)
+                {
+                     Level systemLevel = element as Level;
+                     LevelsDataSource levelsDataSourceRow = new LevelsDataSource();
+
+                     levelsDataSourceRow.LevelIDValue = systemLevel.Id.IntegerValue;
+                     levelsDataSourceRow.Name = systemLevel.Name;
+
+                     Parameter elevationPara = systemLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
+                     
+                     double temValue = Unit.CovertFromAPI(UnitTypeId, elevationPara.AsDouble());
+                     double temValue2 = double.Parse(temValue.ToString("#.0"));
+                     
+                     levelsDataSourceRow.Elevation = temValue2;
+
+                     systemLevelsDatum.Add(levelsDataSourceRow);
+                }
+
+                using (LevelsForm displayForm = new LevelsForm(this))
+                {
+                    displayForm.ShowDialog();
+                }
+            }
+            catch (Exception ex)
+            {
+                message = ex.Message;
+                documentTransaction.RollBack();
+                return Autodesk.Revit.UI.Result.Failed;
+            }
+            documentTransaction.Commit();
+            return Autodesk.Revit.UI.Result.Succeeded;
+        }
+
+        ExternalCommandData m_revit;
+        public Autodesk.Revit.DB.ForgeTypeId UnitTypeId;
+        System.Collections.Generic.List<LevelsDataSource> systemLevelsDatum;
+        /// <summary>
+        /// Store all levels' datum in system
+        /// </summary>
+        public System.Collections.Generic.List<LevelsDataSource> SystemLevelsDatum
+        {
+            get
+            {
+                return systemLevelsDatum;
+            }
+            set
+            {
+                systemLevelsDatum = value;
+            }
+        }
+        #endregion
+
+        #region SetData
+
+
+        /// <summary>
+        /// Set Level
+        /// </summary>
+        /// <param name="levelIDValue">Pass a Level's ID value</param>
+        /// <param name="levelName">Pass a Level's Name</param>
+        /// <param name="levelElevation">Pass a Level's Elevation</param>
+        /// <returns>True if succeed, else return false</returns>
+        public bool SetLevel(int levelIDValue, String levelName, double levelElevation)
+        {
+            try
+            {
+                Autodesk.Revit.DB.ElementId levelID = new Autodesk.Revit.DB.ElementId(levelIDValue);
+                Level systemLevel = m_revit.Application.ActiveUIDocument.Document.GetElement(levelID) as Level;
+
+                Parameter elevationPara = systemLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
+                elevationPara.SetValueString(levelElevation.ToString());
+                systemLevel.Name = levelName;
+
+                return true;
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
+        #endregion
+
+        #region CreateLevel
+        /// <summary>
+        /// Create a level
+        /// </summary>
+        /// <param name="levelName">Pass a Level's Name</param>
+        /// <param name="levelElevation">Pass a Level's Elevation</param>
+        public void CreateLevel(String levelName, double levelElevation)
+        {
+           Level newLevel = Level.Create(m_revit.Application.ActiveUIDocument.Document, levelElevation);
+            Parameter elevationPara = newLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
+            elevationPara.SetValueString(levelElevation.ToString());
+
+            newLevel.Name = levelName;
+        }
+        #endregion
+
+        #region DeleteLevel
+        /// <summary>
+        /// Delete a Level.
+        /// </summary>
+        /// <param name="IDValueOfLevel">A Level's ID value</param>
+        public void DeleteLevel(int IDValueOfLevel)
+        {
+            Autodesk.Revit.DB.ElementId IDOfLevel = new ElementId(IDValueOfLevel);
+
+            m_revit.Application.ActiveUIDocument.Document.Delete(IDOfLevel);
+        }
+        #endregion
+    }
+}
@@ -0,0 +1,86 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc. 
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable. 
+//
+
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Revit.SDK.Samples.LevelsProperty.CS
+{
+    /// <summary>
+    /// Data source used to store a Level
+    /// </summary>
+    public class LevelsDataSource
+    {
+        String m_levelName;
+        double m_levelElevation;
+        int m_levelIDValue;
+
+        /// <summary>
+        /// First column used to store Level's Name
+        /// </summary>
+        public String Name
+        {
+            get
+            {
+                return m_levelName;
+            }
+            set
+            {
+                m_levelName = value;
+            }
+        }
+
+
+        /// <summary>
+        /// Second column to store Level's Elevation
+        /// </summary>
+        public double Elevation
+        {
+            get
+            {
+                return m_levelElevation;
+            }
+            set
+            {
+                m_levelElevation = value;
+            }
+        }
+
+        /// <summary>
+        /// Record Level's ID
+        /// </summary>
+        public int LevelIDValue
+        {
+            get
+            {
+                return m_levelIDValue;
+            }
+            set
+            {
+                m_levelIDValue = value;
+            }
+        }
+
+    }
+}
@@ -0,0 +1,165 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc. 
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable. 
+//
+
+
+namespace Revit.SDK.Samples.LevelsProperty.CS
+{
+    /// <summary>
+    /// new level form
+    /// </summary>
+    partial class LevelsForm
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.components = new System.ComponentModel.Container();
+            this.levelsDataGridView = new System.Windows.Forms.DataGridView();
+            this.okButton = new System.Windows.Forms.Button();
+            this.cancelButton = new System.Windows.Forms.Button();
+            this.deleteButton = new System.Windows.Forms.Button();
+            this.addButton = new System.Windows.Forms.Button();
+            this.bindingSource1 = new System.Windows.Forms.BindingSource(this.components);
+            ((System.ComponentModel.ISupportInitialize)(this.levelsDataGridView)).BeginInit();
+            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).BeginInit();
+            this.SuspendLayout();
+            // 
+            // levelsDataGridView
+            // 
+            this.levelsDataGridView.AllowUserToAddRows = false;
+            this.levelsDataGridView.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+            this.levelsDataGridView.Location = new System.Drawing.Point(16, 15);
+            this.levelsDataGridView.Margin = new System.Windows.Forms.Padding(4, 4, 4, 7);
+            this.levelsDataGridView.Name = "levelsDataGridView";
+            this.levelsDataGridView.RowTemplate.Height = 24;
+            this.levelsDataGridView.Size = new System.Drawing.Size(550, 445);
+            this.levelsDataGridView.TabIndex = 0;
+            this.levelsDataGridView.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.levelsDataGridView_CellValueChanged);
+            this.levelsDataGridView.CellValidating += new System.Windows.Forms.DataGridViewCellValidatingEventHandler(this.levelsDataGridView_CellValidating);
+            this.levelsDataGridView.DataError += new System.Windows.Forms.DataGridViewDataErrorEventHandler(this.levelsDataGridView_DataError);
+            // 
+            // okButton
+            // 
+            this.okButton.DialogResult = System.Windows.Forms.DialogResult.OK;
+            this.okButton.Location = new System.Drawing.Point(382, 512);
+            this.okButton.Margin = new System.Windows.Forms.Padding(4, 7, 4, 4);
+            this.okButton.Name = "okButton";
+            this.okButton.Size = new System.Drawing.Size(88, 28);
+            this.okButton.TabIndex = 1;
+            this.okButton.Text = "&OK";
+            this.okButton.UseVisualStyleBackColor = true;
+            this.okButton.Click += new System.EventHandler(this.okButton_Click);
+            // 
+            // cancelButton
+            // 
+            this.cancelButton.DialogResult = System.Windows.Forms.DialogResult.Cancel;
+            this.cancelButton.Location = new System.Drawing.Point(478, 512);
+            this.cancelButton.Margin = new System.Windows.Forms.Padding(4, 4, 7, 4);
+            this.cancelButton.Name = "cancelButton";
+            this.cancelButton.Size = new System.Drawing.Size(88, 28);
+            this.cancelButton.TabIndex = 2;
+            this.cancelButton.Text = "&Cancel";
+            this.cancelButton.UseVisualStyleBackColor = true;
+            // 
+            // deleteButton
+            // 
+            this.deleteButton.Image = global::Revit.SDK.Samples.LevelsProperty.CS.Properties.Resources.delete;
+            this.deleteButton.Location = new System.Drawing.Point(51, 473);
+            this.deleteButton.Margin = new System.Windows.Forms.Padding(4, 6, 4, 4);
+            this.deleteButton.Name = "deleteButton";
+            this.deleteButton.Size = new System.Drawing.Size(30, 28);
+            this.deleteButton.TabIndex = 4;
+            this.deleteButton.UseVisualStyleBackColor = true;
+            this.deleteButton.Click += new System.EventHandler(this.deleteButton_Click);
+            // 
+            // addButton
+            // 
+            this.addButton.Image = global::Revit.SDK.Samples.LevelsProperty.CS.Properties.Resources._new;
+            this.addButton.Location = new System.Drawing.Point(13, 473);
+            this.addButton.Margin = new System.Windows.Forms.Padding(4, 6, 4, 4);
+            this.addButton.Name = "addButton";
+            this.addButton.Size = new System.Drawing.Size(30, 28);
+            this.addButton.TabIndex = 3;
+            this.addButton.UseVisualStyleBackColor = true;
+            this.addButton.Click += new System.EventHandler(this.addButton_Click);
+            // 
+            // LevelsForm
+            // 
+            this.AcceptButton = this.okButton;
+            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.CancelButton = this.cancelButton;
+            this.ClientSize = new System.Drawing.Size(579, 553);
+            this.Controls.Add(this.deleteButton);
+            this.Controls.Add(this.addButton);
+            this.Controls.Add(this.cancelButton);
+            this.Controls.Add(this.okButton);
+            this.Controls.Add(this.levelsDataGridView);
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
+            this.Margin = new System.Windows.Forms.Padding(4);
+            this.MaximizeBox = false;
+            this.MinimizeBox = false;
+            this.Name = "LevelsForm";
+            this.ShowInTaskbar = false;
+            this.Text = "Levels Property";
+            ((System.ComponentModel.ISupportInitialize)(this.levelsDataGridView)).EndInit();
+            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).EndInit();
+            this.ResumeLayout(false);
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.DataGridView levelsDataGridView;
+        private System.Windows.Forms.BindingSource bindingSource1;
+        private System.Windows.Forms.Button okButton;
+        private System.Windows.Forms.Button cancelButton;
+        private System.Windows.Forms.Button addButton;
+        private System.Windows.Forms.Button deleteButton;
+
+        //The following code is added by programmer.
+        private System.Windows.Forms.DataGridViewTextBoxColumn LevelName;
+        private System.Windows.Forms.DataGridViewTextBoxColumn LevelElevation;
+    }
+}
@@ -0,0 +1,323 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc. 
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable. 
+//
+
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Text;
+using System.Windows.Forms;
+
+using Autodesk.Revit.UI;
+
+namespace Revit.SDK.Samples.LevelsProperty.CS
+{
+    /// <summary>
+    /// form for new levels
+    /// </summary>  
+    public partial class LevelsForm : System.Windows.Forms.Form
+    {
+        /// <summary>
+        /// form for new levels
+        /// </summary>
+        public LevelsForm()
+        {
+            InitializeComponent();
+        }
+
+        #region Constructor
+        /// <summary>
+        /// The constructor is used to initialize some object.
+        /// </summary>
+        /// <param name="opt">Used to get the Command class's object.</param>
+        public LevelsForm(Command opt)
+        {
+            InitializeComponent();
+
+            m_objectReference = opt;
+
+            //Set control on UI
+            LevelName = new DataGridViewTextBoxColumn();
+            LevelName.HeaderText = "Name";
+            LevelName.Width = 142;
+
+            LevelElevation = new DataGridViewTextBoxColumn();
+            LevelElevation.HeaderText = "Elevation";
+            LevelElevation.Width = 142;
+
+            levelsDataGridView.Columns.AddRange(new DataGridViewColumn[] { LevelName, LevelElevation });
+
+            bindingSource1.DataSource = typeof(Revit.SDK.Samples.LevelsProperty.CS.LevelsDataSource);
+            //Must place below code on the code "dataGridView1.DataSource = bindingSource1"
+            levelsDataGridView.AutoGenerateColumns = false;
+            levelsDataGridView.DataSource = bindingSource1;
+            LevelName.DataPropertyName = "Name";
+            LevelElevation.DataPropertyName = "Elevation";
+
+            //pass datum to BindingSource
+            bindingSource1.DataSource = m_objectReference.SystemLevelsDatum;
+
+            //Record system levels' total
+            m_systemLevelsTotal = m_objectReference.SystemLevelsDatum.Count;
+
+            //Record changed items
+            m_changedItemsFlag = new int[m_systemLevelsTotal];
+
+            //Record deleted items
+            m_deleteExistLevelIDValue = new int[m_systemLevelsTotal];
+            m_deleteExistLevelTotal = 0;
+        }
+
+        //Class Command's object reference
+        Command m_objectReference;
+        #endregion
+
+        #region AddItem
+        /// <summary>
+        /// Used to a new item in the dataGridView control.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void addButton_Click(object sender, EventArgs e)
+        {
+            System.String newLevelName;
+            double newLevelElevation;
+
+            //If it exists some Levels on Revit, 
+            //the added item's Name and Elevation uses last a Level's Name and Elevation.
+            //Otherwise it uses a default data.
+            if (bindingSource1.Count > 0)
+            {
+                bindingSource1.MoveLast();
+                LevelsDataSource lastItem = bindingSource1.Current as LevelsDataSource;
+
+                System.String lastLevelName = lastItem.Name;
+                double lastLevelElevation = lastItem.Elevation;
+                newLevelName = lastLevelName + "'";
+                newLevelElevation = lastLevelElevation + Unit.CovertFromAPI(m_objectReference.UnitTypeId, 10);
+
+            }
+            else
+            {
+                newLevelName = "Level" + " " + "1";
+                newLevelElevation = 0;
+            }
+
+
+            LevelsDataSource newLevel = new LevelsDataSource();
+            newLevel.Name = newLevelName;
+            newLevel.Elevation = newLevelElevation;
+
+            bindingSource1.Add(newLevel);
+        }
+
+        //Record system levels' total
+        int m_systemLevelsTotal;
+        #endregion
+
+        #region RemoveItem
+        /// <summary>
+        /// Used to delete a item.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void deleteButton_Click(object sender, EventArgs e)
+        {
+            if (1 == levelsDataGridView.RowCount)
+            {
+                TaskDialog.Show("Revit", "Deleting the only open view in the project is not allowed.");
+                return;
+            }
+
+            if (bindingSource1.Position > m_systemLevelsTotal - 1)
+            {
+                bindingSource1.RemoveCurrent();
+                return;
+            }
+
+            if (bindingSource1.Position <= m_systemLevelsTotal - 1 && bindingSource1.Position >= 0)
+            {
+                LevelsDataSource aRow = bindingSource1.Current as LevelsDataSource;
+                m_deleteExistLevelIDValue[m_deleteExistLevelTotal] = aRow.LevelIDValue;
+                m_deleteExistLevelTotal++;
+
+                bindingSource1.RemoveCurrent();
+
+                m_systemLevelsTotal = m_systemLevelsTotal - 1;
+
+                int[] temChangedItemsFlag = new int[m_systemLevelsTotal];
+                for (int i = 0, j = 0; i < m_systemLevelsTotal; i++, j++)
+                {
+                    if (bindingSource1.Position == i)
+                    {
+                        j++;
+                    }
+                    temChangedItemsFlag[i] = m_changedItemsFlag[j];
+                }
+                m_changedItemsFlag = temChangedItemsFlag;
+
+                return;
+            }
+
+            if (bindingSource1.Position < 0)
+            {
+                Autodesk.Revit.UI.TaskDialog.Show("Revit", "No have Level.");
+            }
+        }
+
+        int[] m_deleteExistLevelIDValue;
+        int m_deleteExistLevelTotal;
+        #endregion
+
+        #region CheckAndRecord
+        /// <summary>
+        /// Judge if the inputted Name is unique.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void levelsDataGridView_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
+        {
+            if (0 == levelsDataGridView.CurrentCell.ColumnIndex)
+            {
+                System.String newName = e.FormattedValue as System.String;
+
+                char[] newNameArray = new char[newName.Length];
+                newNameArray = newName.ToCharArray();
+                for (int i = 0; i < newName.Length; ++i)
+                {
+                    if ('\\' == newNameArray[i] || ':' == newNameArray[i] || '{' == newNameArray[i] ||
+                        '}' == newNameArray[i] || '[' == newNameArray[i] || ']' == newNameArray[i] ||
+                        '|' == newNameArray[i] || ';' == newNameArray[i] || '<' == newNameArray[i] ||
+                        '>' == newNameArray[i] || '?' == newNameArray[i] || '`' == newNameArray[i] ||
+                        '~' == newNameArray[i])
+                    {
+                        TaskDialog.Show("Revit", "Name cannot contain any of the following characters:\r\n\\ "
+                        + ": { } [ ] | ; < > ? ` ~ \r\nor any of the non-printable characters.");
+
+                        e.Cancel = true;
+
+                        return;
+                    }
+                }
+
+                System.String oldName = levelsDataGridView.CurrentCell.FormattedValue as System.String;
+                if (newName != oldName)
+                {
+                    for (int i = 0; i < m_objectReference.SystemLevelsDatum.Count; i++)
+                    {
+                        if (m_objectReference.SystemLevelsDatum[i].Name == newName)
+                        {
+                            TaskDialog.Show("Revit", "The name entered is already in use. Enter a unique name.");
+                            e.Cancel = true;
+                        }
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Judge if the inputted Elevation is valid.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void levelsDataGridView_DataError(object sender, DataGridViewDataErrorEventArgs e)
+        {
+            Autodesk.Revit.UI.TaskDialog.Show("Revit", e.Exception.Message);
+        }
+
+        /// <summary>
+        /// Record the changed Item.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void levelsDataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e)
+        {
+            if (bindingSource1.Position < m_systemLevelsTotal)
+            {
+                m_systemLevelChangedFlag = 1;
+                m_changedItemsFlag[bindingSource1.Position] = 1;
+            }
+        }
+
+        //Record changed item
+        int[] m_changedItemsFlag;
+        int m_systemLevelChangedFlag = 0;
+        #endregion
+
+        #region okButton
+        /// <summary>
+        /// Used to make setting apply to the model.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void okButton_Click(object sender, EventArgs e)
+        {
+
+            //Delete existed Levels
+            for (int i = 0; i < m_deleteExistLevelTotal; i++)
+            {
+                m_objectReference.DeleteLevel(m_deleteExistLevelIDValue[i]);
+            }
+
+            List<LevelsDataSource> tempLevels = new List<LevelsDataSource>();
+
+            //Set all changed Levels' name and elevation
+            if (1 == m_systemLevelChangedFlag)
+            {
+                for (int i = 0; i < m_changedItemsFlag.LongLength; i++)
+                {
+                    if (1 == m_changedItemsFlag[i])
+                    {
+                        bindingSource1.Position = i;
+                        LevelsDataSource changeItem = bindingSource1.Current as LevelsDataSource;
+
+                        if (false == m_objectReference.SetLevel(changeItem.LevelIDValue, changeItem.Name, changeItem.Elevation))
+                        {
+                            changeItem.Name = "TempName" + changeItem.Name;
+                            tempLevels.Add(changeItem);
+                            m_objectReference.SetLevel(changeItem.LevelIDValue, changeItem.Name, changeItem.Elevation);
+                        }
+                    }
+                }
+            }
+
+            foreach (LevelsDataSource item in tempLevels)
+            {
+                item.Name = item.Name.Remove(0, 8); // Remove the "TempName" string
+                m_objectReference.SetLevel(item.LevelIDValue, item.Name, item.Elevation);
+            }
+
+            //Create new Levels
+            for (int i = m_systemLevelsTotal; i < bindingSource1.Count; i++)
+            {
+                bindingSource1.Position = i;
+                LevelsDataSource newItem = bindingSource1.Current as LevelsDataSource;
+                m_objectReference.CreateLevel(newItem.Name, newItem.Elevation);
+            }
+        }
+        #endregion
+
+
+    }
+}
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="bindingSource1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RevitAddIns>
+  <AddIn Type="Command">
+    <Assembly>LevelsProperty.dll</Assembly>
+    <ClientId>06f0a233-f472-4ca4-a271-d77b55fefe58</ClientId>
+    <FullClassName>Revit.SDK.Samples.LevelsProperty.CS.Command</FullClassName>
+    <Text>Create levels</Text>
+    <Description>Show how to get all the levels in a document and how to create and delete a level and set its properties.</Description>
+    <VisibilityMode>AlwaysVisible</VisibilityMode>
+    <VendorId>ADSK</VendorId>
+    <VendorDescription>Autodesk, www.autodesk.com</VendorDescription>
+  </AddIn>
+</RevitAddIns>
@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>9.0.30729</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{3BDA192E-06F3-43B2-8ADD-A1D8766935A0}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Revit.SDK.Samples.LevelsProperty.CS</RootNamespace>
+    <AssemblyName>LevelsProperty</AssemblyName>
+    <SccProjectName>
+    </SccProjectName>
+    <SccLocalPath>
+    </SccLocalPath>
+    <SccAuxPath>
+    </SccAuxPath>
+    <SccProvider>
+    </SccProvider>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x64\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x64</PlatformTarget>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
+    <OutputPath>bin\x64\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x64</PlatformTarget>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup>
+    <RunPostBuildEvent>OnOutputUpdated</RunPostBuildEvent>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Command.cs" />
+    <Compile Include="LevelsDataSource.cs" />
+    <Compile Include="LevelsForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="LevelsForm.Designer.cs">
+      <DependentUpon>LevelsForm.cs</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Unit.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="LevelsForm.resx">
+      <SubType>Designer</SubType>
+      <DependentUpon>LevelsForm.cs</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\add.ico" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\subtract.ico" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\delete.ico" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\new.ico" />
+  </ItemGroup>
+  <Import Project="$(SolutionDir)VSProps\SDKSamples.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+  <PropertyGroup>
+    <PostBuildEvent>set FILEFORSAMPLEREG="$(SolutionDir)..\..\..\..\Regression\API\SDKSamples\UpdateSampleDllForRegression.pl"
+if exist %25FILEFORSAMPLEREG%25 perl %25FILEFORSAMPLEREG%25 $(ProjectExt) "$(ProjectPath)" "$(TargetPath)" "$(SolutionDir)"</PostBuildEvent>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
+  </PropertyGroup>
+</Project>
@@ -0,0 +1,58 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc. 
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable. 
+//
+
+
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("LevelsProperty")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("LevelsProperty")]
+[assembly: AssemblyCopyright("Copyright © Autodesk, Inc. 2009")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("0447196f-4030-40f3-bceb-1fe73d0ecc06")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Revision and Build Numbers 
+// by using the '*' as shown below:
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
@@ -0,0 +1,103 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Revit.SDK.Samples.LevelsProperty.CS.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Revit.SDK.Samples.LevelsProperty.CS.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap _new {
+            get {
+                object obj = ResourceManager.GetObject("new", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap add {
+            get {
+                object obj = ResourceManager.GetObject("add", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap delete {
+            get {
+                object obj = ResourceManager.GetObject("delete", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap subtract {
+            get {
+                object obj = ResourceManager.GetObject("subtract", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+    }
+}
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="add" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\add.ico;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+  <data name="subtract" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\subtract.ico;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+  <data name="delete" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\delete.ico;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+  <data name="new" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\new.ico;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+</root>
@@ -0,0 +1,61 @@
+//
+// (C) Copyright 2003-2019 by Autodesk, Inc.
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable.
+//
+
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Autodesk.Revit;
+using Autodesk.Revit.DB;
+
+namespace Revit.SDK.Samples.LevelsProperty.CS
+{
+    /// <summary>
+    /// Provides static functions to convert unit
+    /// </summary>
+    static class Unit
+    {
+        #region Methods
+        /// <summary>
+        /// Convert the value get from RevitAPI to the value indicated by ForgeTypeId
+        /// </summary>
+        /// <param name="to">ForgeTypeId indicates unit of target value</param>
+        /// <param name="value">value get from RevitAPI</param>
+        /// <returns>Target value</returns>
+        public static double CovertFromAPI(ForgeTypeId to, double value)
+        {
+            return UnitUtils.ConvertFromInternalUnits(value, to);
+        }
+
+        /// <summary>
+        /// Convert a value indicated by ForgeTypeId to the value used by RevitAPI
+        /// </summary>
+        /// <param name="value">Value to be converted</param>
+        /// <param name="from">ForgeTypeId indicates the unit of the value to be converted</param>
+        /// <returns>Target value</returns>
+        public static double CovertToAPI(double value, ForgeTypeId from)
+        {
+            return UnitUtils.ConvertToInternalUnits(value, from);
+        }
+        #endregion
+    }
+}