How to know the RadDiagram change?

[Jonathan]

Hi, I want to save a RadDiagram to a file just when it changed. How to know the RadDiagram has changed? like isDirty property

[Dinko | Tech Support Engineer]

Hi Jonathan,

You can try subscribing to the CommandExecuted event of the RadDiagram. In Its handler e.Command will show you the type of the command for every change you perform on the diagram. In addition, you can take a look at the Diagram Events help article in our documentation.

Give this event a try and let us know if this works for you.

Regards,
Dinko
Telerik

[Antonio]

Dinko, thank you 
My code looks like this:

        private void Diagram_CommandExecuted(object sender, CommandRoutedEventArgs e)
        {
            if (e.ExecuteAction == ExecuteAction.Undo)
            {
                if (diagram.UndoRedoService.UndoStack.Count() == 0)
                {
                    DesignChanged = false;
                }
            }
            else
            {
                DesignChanged = true;
            }
        }

        public bool DesignChanged
        {
            get
            {
                return designChanged;
            }

            set
            {
                //diagram.IsChanged = value;
                if (designChanged != value)
                {
                    var title = mainWindow.Title.TrimEnd();
                    if (!value)
                    {
                        if (title.EndsWith("*"))
                        {
                            mainWindow.Title = title.TrimEnd('*');
                        }
                    }
                    else
                    {
                        if (!title.EndsWith("*"))
                        {
                            mainWindow.Title = title + " *";
                        }
                    }
                    designChanged = value;
                }
            }
        }