Undo,Redo functionalities for Designer host not working

[anupam roy]

Hi All,

I want to perform basic Edit menu functionalities on my custom design surface.
While all the Cut/Copy/Paste/Deelete/Select functionalities working fine with code below,Undo/Redo standard commands are not working for me.

IMenuCommandService menusrv= HostControl.HostSurface.GetService(typeof(IMenuCommandService)) as IMenuCommandService;
             if (menusrv != null)
             {
                 switch (editstring)
                 {
////////////////////////////////////////////
//Undo/Redo not working    ////
//////////////////////////////////////////
                     case "Undo/Redo":
                       menusrv.GlobalInvoke(StandardCommands.undo/StandardCommands.Redo)
break;

                      case "Cut":
                         menusrv.GlobalInvoke(StandardCommands.Cut);
                         break;
                     case "Copy":
                         menusrv.GlobalInvoke(StandardCommands.Copy);
                         break;
                     case "Paste":
                         menusrv.GlobalInvoke(StandardCommands.Paste);
                         break;
                     case "Delete":
                         menusrv.GlobalInvoke(StandardCommands.Delete);
                         break;
                     case "SelectAll":
                         menusrv.GlobalInvoke(StandardCommands.SelectAll);
                         break;
}
}

It will be of great help if sumbody can share a piece of code to implement Undo/Redo functionalitis.

I am using .NET 2003,C#
Help will be much appreciated!

Thanks and Regards,
-Anupam Roy

[kenobewan]

This example may help:

Undo and redo commands in the constructor

AddCommand(new MenuCommand(new EventHandler(this.ExecuteUndo), StandardCommands.Undo));

AddCommand(new MenuCommand(new EventHandler(this.ExecuteRedo), StandardCommands.Redo));

void ExecuteUndo(object sender, EventArgs e)

{

UndoEngineImpl undoEngine = _host.GetService(typeof(UndoEngine)) as UndoEngineImpl;

if (undoEngine != null)

undoEngine.DoUndo();

}

void ExecuteRedo(object sender, EventArgs e)

{

UndoEngineImpl undoEngine = _host.GetService(typeof(UndoEngine)) as UndoEngineImpl;

if (undoEngine != null)

undoEngine.DoRedo();

}