added Revit 2020 SDK files

SDK/Samples/CustomExporter/Custom2DExporter/CS/Export2DView.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Revit.SDK.Samples.Custom2DExporter.CS
+{
+   public partial class Export2DView : System.Windows.Forms.Form
+   {
+      public Export2DView()
+      {
+         InitializeComponent();
+         m_exportOptions = new ExportOptions();
+         m_exportOptions.ExportAnnotationObjects = false;
+         m_exportOptions.ExportPatternLines = false;
+      }
+
+      ExportOptions m_exportOptions = null;
+
+      public ExportOptions ViewExportOptions
+      {
+         get
+         {
+            return m_exportOptions;
+         }
+      }
+
+      /// <summary>
+      /// The option for creating Path of Travel.
+      /// </summary>
+      public class ExportOptions
+      {
+         bool m_exportAnnotationObjects;
+         bool m_exportPatternLines;
+
+
+         public bool ExportAnnotationObjects
+         {
+            get
+            {
+               return m_exportAnnotationObjects;
+            }
+            set
+            {
+               m_exportAnnotationObjects = value;
+            }
+         }
+
+         public bool ExportPatternLines
+         {
+            get
+            {
+               return m_exportPatternLines;
+            }
+            set
+            {
+               m_exportPatternLines = value;
+            }
+         }
+      }
+
+      private void checkBox2_CheckedChanged(object sender, EventArgs e)
+      {
+         m_exportOptions.ExportAnnotationObjects = checkBox2.Checked;
+      }
+
+      private void checkBox3_CheckedChanged(object sender, EventArgs e)
+      {
+         m_exportOptions.ExportPatternLines = checkBox3.Checked;
+      }
+   }
+}