RevitSdkSamples/SDK/Samples/ContextualAnalyticalModel/CS/CustomPointLoad.cs

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using System;
using System.Windows.Forms;
using System.Collections;
using System.Collections.Generic;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Structure;
using Autodesk.Revit.UI.Selection;

namespace ContextualAnalyticalModel
{
   /// <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)]
   public class CreateCustomPointLoad : IExternalCommand
   {
      /// <summary>
      /// Implement this method as an external command for Revit.
      /// </summary>
      /// <param name="commandData">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 virtual Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
      {
         try
         {
            Document document = commandData.Application.ActiveUIDocument.Document;
            UIDocument activeDoc = commandData.Application.ActiveUIDocument;

            //select object for adding a line load
            Reference eRef = activeDoc.Selection.PickObject(ObjectType.Element, "Please select the analytical element");
            ElementId selectedElementId = null;
            if (eRef != null && eRef.ElementId != ElementId.InvalidElementId)
               selectedElementId = eRef.ElementId;

            XYZ location = activeDoc.Selection.PickPoint("Point Load location");

            using (Transaction transaction = new Transaction(document, "Create custom PointLoad"))
            {
               transaction.Start();
               PointLoad pointLoad = null;

               if(PointLoad.IsPointInsideHostBoundaries(document, selectedElementId, location))
                  pointLoad = PointLoad.Create(document, selectedElementId, location, new XYZ(1,0,0), new XYZ(1, 0, 0), null);

               transaction.Commit();
            }

         }
         catch (Exception ex)
         {
            message = ex.Message;
            return Result.Failed;
         }

         return Result.Succeeded;
      }
   }
}