assets/samples/Samples/GeometryAPI/ComputedSymbolGeometry/CS/Command.cs

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using System;

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

namespace Revit.SDK.Samples.ComputedSymbolGeometry.CS
{
    /// <summary>
    /// A class inherits IExternalCommand interface.
    /// this class controls the class which subscribes handle events and the events' information UI.
    /// like a bridge between them.
    /// </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 Implement 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 Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,
            ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            try
            {
                Transaction trans = new Transaction(commandData.Application.ActiveUIDocument.Document, "Revit.SDK.Samples.ComputedSymbolGeometry");
                trans.Start();
                // create a ComputedSymbolGeometry object 
                ComputedSymbolGeometry computedSymGeo = new ComputedSymbolGeometry(commandData.Application.ActiveUIDocument.Document);
                // execute method to get and show geometry of all instances
                computedSymGeo.GetInstanceGeometry();
                trans.Commit();
                return Result.Succeeded;
            }
            catch (Exception e)
            {
                message = e.Message;
                message += e.StackTrace;
                return Result.Failed;
            }
        }
    }
        #endregion
}