public IObservable <bool> MoveNext()
{
return(call.ReadMessageAsync().ContinueWith(result =>
{
this.current = result;
if (result == null)
{
return call.StreamingResponseCallFinishedTask.Select(_ => false);
}
return Observable.Return(true);
}));
}
public async Task <bool> MoveNext(CancellationToken token)
{
using (call.RegisterCancellationCallbackForToken(token))
{
var result = await call.ReadMessageAsync().ConfigureAwait(false);
this.current = result;
if (result == null)
{
await call.StreamingResponseCallFinishedTask.ConfigureAwait(false);
return(false);
}
return(true);
}
}
public async Task <bool> MoveNext(CancellationToken token)
{
if (token != CancellationToken.None)
{
throw new InvalidOperationException("Cancellation of individual reads is not supported.");
}
var result = await call.ReadMessageAsync().ConfigureAwait(false);
this.current = result;
if (result == null)
{
await call.StreamingCallFinishedTask.ConfigureAwait(false);
return(false);
}
return(true);
}
public async Task <bool> MoveNext(CancellationToken token)
{
var cancellationTokenRegistration = token.CanBeCanceled ? token.Register(() => call.Cancel()) : (IDisposable)null;
using (cancellationTokenRegistration)
{
var result = await call.ReadMessageAsync().ConfigureAwait(false);
this.current = result;
if (result == null)
{
await call.StreamingResponseCallFinishedTask.ConfigureAwait(false);
return(false);
}
return(true);
}
}