BuildingCoder.CmdCreateSharedParams.Execute C# (CSharp) Method

        public Result Execute(
            ExternalCommandData commandData,
            ref string message,
            ElementSet elements)
        {
            UIApplication app = commandData.Application;
              Document doc = app.ActiveUIDocument.Document;

              using ( Transaction t = new Transaction( doc ) )
              {
            t.Start( "Create Shared Parameter" );
            Category cat;
            int i = 0;

            // create instance parameters:

            foreach ( BuiltInCategory target in targets )
            {
              cat = GetCategory( doc, target );
              if ( null != cat )
              {
            CreateSharedParameter( doc, cat, ++i, false );
              }
            }

            // create a type parameter:

            cat = GetCategory( doc, BuiltInCategory.OST_Walls );
            CreateSharedParameter( doc, cat, ++i, true );
            t.Commit();
              }
              return Result.Succeeded;
        }