Feature: ObservableListBind/Property - Add a user definable exception handling routine that is called if an exception occurs when synchronizing.

[gsonnenf]

In IObservableListBind{TItemA,TItemB}, IObservablePropertyBinder add a user definable exception handling routine that is called if an exception occurs when synchronizing and a dirty flag for when a synchronization did not complete successfully.

This would replace the need for the following if exceptions are expected during synchronization:

try { //need for every Add
listA.Add(item);
catch Exception() {
 if (listA.Count != listB.Count) listA.List.Remove(item);
}

with something like this:

obvListBind.SyncExceptionHandler += (sourceList, targetList, eventArgs) => { //Only defined once
if (!obvListBind.IsDirty) return;
if (eventArgs.Action == NotifyCollectionChangedAction.Add)  sourceList.List.RemoveAt(eventArgs.NewStartingIndex);
// ... other events