Get object from DataContext

Question

I have a user control that I created which is a Navigation Bar used with Collections.

When I place the UserControl on a WPF form I connect its DataContext directly to a business object that is based on a Collection(of T).  From here I get the CollectionView and can use MoveCurrentToFirst, MoveCurrentToLast, etc.

If I instead set the DataContext to a binding object whose path is the same Collection(of T), then I cannot cast the UserControl.DataContext into a Collection(of T) and therefore have no access to MoveCurrentTo....

My question is: How can I get the object from the DataContext?

UserControl.DataContext.GetType.Name = Binding
TryCast(UserControl.DataContext, Collection(of Object)) = nothing

I don't know what else to try?

Rick

Answer 1

Hi Rick,

Could you tell me how you bind the DataContext property of the UserControl?

Suppose the business object is as follows:
Collection(of YourType) datasource = new Collection(of YourType);

You can bind the DataContent of the UserControl as follows:
Binding b = new Binding();
b.Source = datasource;
userControl1.SetBinding(UserControl1.DataContextProperty, b);

The value of the UserControl is of type Collection(of YourType), so you can cast it to the type of Collection(of YourType) as follows:
Collection(of YourType) ds = userControl1.DataContext as Collection(of YourType);

Sincerely,
Linda Liu

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Answer 2

Thank you for the response Linda,

I just had a hard drive crash in my development laptop an need to recover.

I'll come back in a day or two to this thread.

Rick