Hi,

We have a scenario where we have to reload the shape nodes from our collection on some event.

so we are calling

diagram.ClearAll();
diagram.UpdateLayout();

before reloading the nodes.

But for some node if the adjustmentHandels were visible, they are not removed from the screen and we are able to see invalid squares (which were previously adjustment handles) after reloading.

it throws error on clicking these squares.

Message: Unhandled Error in Silverlight Application
Code: 4004
Category: ManagedRuntimeError
Message: System.NullReferenceException: Object reference not set to an instance of an object.
at MindFusion.Diagramming.Silverlight.InteractionState.Start()
at MindFusion.Diagramming.Silverlight.BehaviorBase.OnMouseMove(MouseEventArgs e)
at MindFusion.Diagramming.Silverlight.Diagram.x2c5d1da1234c3a6a(Object xe0292b9ed559da7d, MouseEventArgs xfbf34718e704c6bc)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

Please advice.

Thanks in advance
binuvc

Hi,

We tried the same and it is still not working.

The problem is that our design has a controller class which solely has the right to modify the object model representing the diagram. so when ever a modification is required we inform the same to the controller and which inturn modifies the object model and we just reloads the diagram based on the modified object model.

The following is what we are doing on clear all:

UnHookEvents(); // unhooks all the events attached on the diagram control
diagramLite.CancelDrag();
diagramLite.Selection.Clear();
diagramLite.ClearAll();
diagramLite.UpdateLayout();
HookEvents();

Thanks
binuvc

Hi,

We moved the code to link_Created event and still the issue is persisting.

  private void diagram_LinkCreated(object sender, LinkEventArgs e)
        {
            if (e.Link.Origin != e.Link.Destination)
            {

                 this.Dispatcher.BeginInvoke(LoadView);
            }
         }


Please advice.


Thanks
BinuVC