Rehosted Designer Binding Issues

Question

Hello,

I'm working with the latest Windows Workflow Foundation and I'm rehosting the designer. I've browsed around and looked into samples however I keep getting some binding errors that I have no idea how to solve. This is what I get in output:

System.Windows.Data Error: 40 : BindingExpression path error: 'ToolboxItem' property not found on 'object' ''ToolboxItemWrapper' (HashCode=16945151)'. BindingExpression:Path=ToolboxItem.DisplayName; DataItem='ToolboxItemWrapper' (HashCode=16945151); target element is 'TreeViewItem' (Name=''); target property is 'Name' (type 'String')

System.Windows.Data Error: 1 : Cannot create default converter to perform 'one-way' conversions between types 'System.Collections.ObjectModel.Collection`1[System.Activities.Activity]' and 'System.Activities.Presentation.Model.ModelItemCollection'. Consider using Converter property of Binding. BindingExpression:Path=ModelItem.Activities; DataItem='SequenceDesigner' (Name=''); target element is 'WorkflowItemsPresenter' (Name=''); target property is 'Items' (type 'ModelItemCollection')

To my understanding the 2nd error tells that I need to provide a convertor for a binding however I am not making any bindings. I just create the WorkflowDesigner and load a new Sequence instance. I do this in the constructor:

public U4SWorkflowDesignerUserControl()
  {
   InitializeComponent();

   (new DesignerMetadata()).Register();

   _workflowDesigner = new WorkflowDesigner();
   _workflowDesigner.Load(new Sequence());

   _toolboxControl = new ToolboxControl();
   ToolboxCategory toolboxCategory = new ToolboxCategory("Test");
   toolboxCategory.Add(new ToolboxItemWrapper(typeof(Sequence)));
   _toolboxControl.Categories.Add(toolboxCategory);

   Grid.SetColumn(_workflowDesigner.View, 2);

   grid1.Children.Add(_toolboxControl);
   grid1.Children.Add(_workflowDesigner.View);
  }

If I comment the line with (new DesignerMetadata()).Register(); I receive no binding errors however that makes the designer useless since I cannot edit anything.

Thanks in advance,

Andrei Fangli

Answer 1

Hi,

they usually seem to be ignorable.For more information, you can refer here

http://social.msdn.microsoft.com/Forums/vstudio/en-US/4134125f-1b99-478a-8f9d-6d1299dbe1d7/toolboxitem-binding-error?forum=wfprerelease

http://social.msdn.microsoft.com/Forums/vstudio/en-US/65ef5d65-1c51-4ea2-9d0e-d5b246527db7/data-error-in-sequencedesigner?forum=wfprerelease

#In Workflow Activity Icons in a rehosted Workflow Designer

http://blogs.msdn.com/b/asgisv/archive/2010/02/10/displaying-net-framework-4-built-in-workflow-activity-icons-in-a-rehosted-workflow-designer.aspx

Hope it can help you.

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Answer 2

Thanks for the links. Unfortunately I still can't get the errors to disappear, it seems to be something internal to WF as they show even when I'm not making any bindings.