Data error in SequenceDesigner

Question

Hi, all,

I created simple application to re-host a work designer. What I did is just setting a WorkflowDesigner's View as the content of my main window and a Sequence activity as the root element of the designer, but I got such a message in the output window:

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')

Is it a known issue of WF4 designer or I missed something?

Thanks

Answer 1

Please take a look at the thread below, I think your question is quite similiar to that one:

http://social.msdn.microsoft.com/Forums/en-US/wfprerelease/thread/15814860-ed65-4c1c-892c-cb7d0c4d2204

Answer 2

Hi Akira, could you post your code?

Answer 3

Hi, Kenny,

My case is very similar to Jeff's link: the code works, but I got an error info in the output window, and I'd like to resolve it if possible.

Thanks

Ming

Answer 4

Hi to everyone,
Just want to add that I see these output messages frequently and I don't know a good way to get rid of them but they usually seem to be ignorable.
Tim

Answer 5

hi,

i got the same issue as you describe here.

did you manage to overcome this issue?

for me, i fail to recover from this exception and the app shuts down.

thank you,

Yali

Answer 6

Hi

I faced the same problem and found out it was because of absence of calling this in rehosted designer

                new DesignerMetadata().Register();

<object data-extension-version="0.4.0.129" data-install-updates-user-configuration="true" id="__symantecPKIClientMessenger" style="display:none;"></object>