private void DoWork()
{
while (!_shutdownToken.IsCancellationRequested)
{
try
{
_hasWork.Wait(_shutdownToken.Token);
}
catch (OperationCanceledException)
{
return;
}
catch (ObjectDisposedException)
{
return;
}
_hasWork.Reset();
lock (_lockObject)
{
_currentParseCancellationTokenSource = new CancellationTokenSource();
}
var snapshot = _textBuffer.CurrentSnapshot;
try
{
var cancellationToken = _currentParseCancellationTokenSource.Token;
CreateSyntaxTree(snapshot, cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
var args = new BackgroundParserEventArgs(snapshot, cancellationToken);
RaiseEvent(SyntaxTreeAvailable, args);
if (TryCreateSemanticModel(snapshot, cancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
RaiseEvent(SemanticModelAvailable, args);
}
}
catch (OperationCanceledException)
{
}
Thread.Yield();
}
}
private void RaiseEvent(EventHandler<BackgroundParserEventArgs> handler, BackgroundParserEventArgs args)
{
if (handler == null)
return;
foreach (EventHandler<BackgroundParserEventArgs> h in handler.GetInvocationList())
{
args.CancellationToken.ThrowIfCancellationRequested();
h(this, args);
}
}