RevitSdkSamples/SDK/Samples/ContextMenu/CS/ContextMenuCreator.cs

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using Autodesk.Revit.UI;


namespace Revit.SDK.Samples.ContextMenu.CS
{
   /// <summary>
   /// Implements the Revit add-in interface IContextMenuCreator,
   /// build context menu passed in.
   /// </summary>
   public class ContextMenuCreator : IContextMenuCreator
   {
      public void BuildContextMenu(Autodesk.Revit.UI.ContextMenu menu)
      {
         // Add a command menu item.
         var item1 = new CommandMenuItem("Show Selection", typeof(ShowSelection).FullName, typeof(ContextMenuApplication).Assembly.Location);
         item1.SetAvailabilityClassName(typeof(ShowSelection).FullName);
         menu.AddItem(item1);

         // Add a separator.
         menu.AddItem(new SeparatorItem());

         var subMenu = new Autodesk.Revit.UI.ContextMenu();
         var item2 = new CommandMenuItem("Show Selection", typeof(ShowSelection).FullName, typeof(ContextMenuApplication).Assembly.Location);
         item2.SetAvailabilityClassName(typeof(ShowSelection).FullName);
         subMenu.AddItem(item2);
         // Add a sub-menu item.
         menu.AddItem(new SubMenuItem("subMenu", subMenu));
      }
   }

}