/// <summary>
/// Executes the specified action on a thread associated with object's dispatcher.
/// This invokes a InvokeAsync on the Dispatcher, does not wait for the action
/// to complete -- returns immediately.
/// </summary>
/// <param name="action">An action to execute.</param>
/// <returns>A task that completes when action has completed.</returns>
private async Task CheckAccessInvokeAsync(Action action)
{
ArgumentValidation.NotNull(action, "action");
if (this.dispatcher.CheckAccess())
{
action();
}
else
{
await this.dispatcher.InvokeAsync(action, DispatcherPriority.Normal);
}
}
/// <summary>
/// Creates a new transformed collection wrapping a source collection.
/// </summary>
/// <param name="sourceCollection">The source collection that this collection wraps.</param>
/// <param name="setup">The logic for creating a transformed element from a source element.</param>
/// <param name="teardown">The logic for destroying a transformed element when removed from the transformed collection.</param>
public TransformedDispatcherCollection(Dispatcher dispatcher, TSourceCollection sourceCollection, Func <TSourceElement, TTargetElement> setup, Action <TTargetElement> teardown = null) :
base(new List <TTargetElement>(sourceCollection.Select(setup)))
{
ArgumentValidation.NotNull(dispatcher, "dispatcher");
ArgumentValidation.NotNull(sourceCollection, "sourceCollection");
ArgumentValidation.NotNull(setup, "setup");
this.setup = setup;
this.teardown = teardown;
this.dispatcher = dispatcher;
this.sourceCollection = sourceCollection;
CollectionChangedEventManager.AddListener(this.sourceCollection, this);
}