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);
}
public SynchronousCompletionAsyncResult <object> FindAsync(string name)
{
var found = Find(name);
if (found != null)
{
return(new SynchronousCompletionAsyncResult <object>(found));
}
if (IsCompleted)
{
return(new SynchronousCompletionAsyncResult <object>((object)null));
}
if (!_pendingSearches.TryGetValue(name, out var tcs))
{
// We are intentionally running continuations synchronously here
_pendingSearches[name] = tcs = new SynchronousCompletionAsyncResultSource <object>();
}
return(tcs.AsyncResult);
}
