public SynchronousCompletionAsyncResult <object> DoFindAsync(string name)
{
var src = new SynchronousCompletionAsyncResultSource <object>();
void ParentSearch()
{
var parentSearch = _parentScope.FindAsync(name);
if (parentSearch.IsCompleted)
{
src.SetResult(parentSearch.GetResult());
}
else
{
parentSearch.OnCompleted(() => src.SetResult(parentSearch.GetResult()));
}
}
if (!_inner.IsCompleted)
{
// Guaranteed to be incomplete at this point
var innerSearch = _inner.FindAsync(name);
innerSearch.OnCompleted(() =>
{
var value = innerSearch.GetResult();
if (value != null)
{
src.SetResult(value);
}
else
{
ParentSearch();
}
});
}
else
{
ParentSearch();
}
return(src.AsyncResult);
}
/// <summary>
/// Tracks a named control relative to another control.
/// </summary>
/// <param name="scope">The scope relative from which the object should be resolved.</param>
/// <param name="name">The name of the object to find.</param>
public static IObservable <object> Track(INameScope scope, string name)
{
return(new NeverEndingSynchronousCompletionAsyncResultObservable <object>(scope.FindAsync(name)));
}
async void FindAsync(INameScope scope, string name)
{
_found = await scope.FindAsync(name);
}