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

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// (C) Copyright 2003-2019 by Autodesk, Inc.
//
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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.AddElementsToConnection.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, "Update structural connection");
         TransactionStatus ts = TransactionStatus.Uninitialized;

         try
         {
            // Select the connection to add input elements to, 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;
            }

            // Select elements to add to connection
            IList<ElementId> ids = Utilities.Functions.SelectConnectionElements(activeDoc, "Select elements to add to connection :");

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

            // Start the transaction
            trans.Start();
            // Add the elements to the connection
            conn.AddElementIds(ids);
            // 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 = "No or already existing input elements selected!";
            return Result.Failed;
         }
         return Result.Succeeded;
      }
    }
}