I have two WPF applications "UI", "Debugger" and one ClassLibrary "BL". UI references to Debugger and BL. Debugger references to BL. I have collection in BL called MyCollection. UI app starts the Debugger app and Debugger binds to a collection MyCollection in BL. When I try changing the MyCollection collection from UI app I am getting exception.
A first chance exception of type 'System.NotSupportedException' occurred in PresentationFramework.dll
Additional information: This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread.
I was googling around and found this: BindingOperations.EnableCollectionSynchronization I can't figure out how to use it. I don't want to reference to any UI dlls from my BL project. Can anybody assist me on that?
Thanks for the help!
All the examples I've seen on Stack Overflow for this get it wrong. You must lock the collection when modifying it from another thread.
On dispatcher (UI) thread:
_itemsLock = new object();
Items = new ObservableCollection<Item>();
BindingOperations.EnableCollectionSynchronization(Items, _itemsLock);
Then from another thread:
lock (_itemsLock)
{
// Once locked, you can manipulate the collection safely from another thread
Items.Add(new Item());
Items.RemoveAt(0);
}
More information in this article: http://10rem.net/blog/2012/01/20/wpf-45-cross-thread-collection-synchronization-redux