private static Task <long?> GetPageLengthAsync()
{
Program.AsyncStateMachine stateMachine = new Program.AsyncStateMachine();
stateMachine.Builder = AsyncTaskMethodBuilder <long?> .Create();
stateMachine.State = -1;
stateMachine.Builder.Start <Program.AsyncStateMachine>(ref stateMachine);
return(stateMachine.Builder.Task);
}
void IAsyncStateMachine.MoveNext()
{
int num1 = this.State;
long?contentLength;
try
{
TaskAwaiter <HttpResponseMessage> awaiter;
int num2;
if (num1 != 0)
{
this._client = new HttpClient();
awaiter = this._client.GetAsync("http://apress.com").GetAwaiter();
if (!awaiter.IsCompleted)
{
this.State = num2 = 0;
this._awaiter = awaiter;
Program.AsyncStateMachine stateMachine = this;
this.Builder.AwaitUnsafeOnCompleted <TaskAwaiter <HttpResponseMessage>, Program.AsyncStateMachine> (ref awaiter, ref stateMachine);
return;
}
}
else
{
awaiter = this._awaiter;
this._awaiter = new TaskAwaiter <HttpResponseMessage>();
this.State = num2 = -1;
}
this._responce2 = awaiter.GetResult();
this._responce1 = this._responce2;
this._responce2 = (HttpResponseMessage)null;
contentLength = this._responce1.Content.Headers.ContentLength;
}
catch (Exception ex)
{
this.State = -2;
this.Builder.SetException(ex);
return;
}
this.State = -2;
this.Builder.SetResult(contentLength);
}