RevitSdkSamples/SDK/Samples/SampleCommandsSteelElements/CS/AddElementsToCustomConnection.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
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// object code form for any purpose and without fee is hereby granted,
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using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Structure;
using Autodesk.Revit.UI;
using System.Collections.Generic;
using System.Linq;




namespace Revit.SDK.Samples.SampleCommandsSteelElements.AddElementsToCustomConnection.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
   {
      /// <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)
      {
         // Get the document from external command data.
         UIDocument activeDoc = commandData.Application.ActiveUIDocument;
         Autodesk.Revit.DB.Document doc = activeDoc.Document;
         if (null == doc)
         {
            return Result.Failed;
         }

         // The transaction and its status. We use Revit's Transaction class for this purpose
         Autodesk.Revit.DB.Transaction trans = new Autodesk.Revit.DB.Transaction(doc, "Add element(s) to custom connection");
         TransactionStatus ts = TransactionStatus.Uninitialized;

         try
         {
            // Selecting the custom connection, using Revit's StructuralConnectionHandler class
            // for more details, please consult http://www.autodesk.com/adv-steel-api-walkthroughs-2019-enu
            StructuralConnectionHandler conn = Utilities.Functions.SelectConnection(activeDoc);

            if (null == conn)
            {
               return Result.Failed;
            }

            if (!(conn.IsCustom()))
            {
               return Result.Failed;
            }
            // Select elements to add to connection.
            IList<Reference> refs = Utilities.Functions.SelectConnectionElementsCustom(activeDoc);

            if (refs.Count() <= 0)
            {
               return Result.Failed;
            }

            // Start transaction
            trans.Start();
            // Adding the elements to the custom connection, using Revit's StructuralConnectionHandlerType class
            StructuralConnectionHandlerType.AddElementsToCustomConnection(conn, refs);
            // Commit the transaction
            ts = trans.Commit();

            if (ts != TransactionStatus.Committed)
            {
               message = "Failed to commit the current transaction !";
               trans.RollBack();
               return Result.Failed;
            }
         }
         
         catch (Autodesk.Revit.Exceptions.OperationCanceledException)
         {
            if (ts != TransactionStatus.Uninitialized)
            {
               trans.RollBack();
            }
            trans.Dispose();
            return Result.Cancelled;
         }
         catch (Autodesk.Revit.Exceptions.ArgumentException)
         {
            if (ts != TransactionStatus.Uninitialized)
            {
               trans.RollBack();
            }
            trans.Dispose();
            message = "Custom connection already contains the selected element(s)!";
            return Result.Failed;
         }
         return Result.Succeeded;
      }
   }
}