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在异步处理程序中我从webrequest中创建一个IObservable，它返回一个重定向字符串。IHttpAsyncHandler和IObservable web请求
我订阅了那个observable并调用了AsyncResult.CompleteCall（），但我不得不使用Thread.Sleep（100）来获得它的执行。而且每次都不行。我很确定这是不正确的。你能否照亮一些光。谢谢！
public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object state)
{
_context = context;
_ar = new AsyncResult(cb, state);
_tweet = context.Request["tweet"];
string url = context.Request["url"];
if(String.IsNullOrEmpty(_tweet) || String.IsNullOrEmpty(url))
{
DisplayError("<h2>Tweet or url cannot be empty</h2>");
return _ar;
}
_oAuth = new oAuthTwitterRx();
using (_oAuth.AuthorizationLinkGet().Subscribe(p =>
{
_context.Response.Redirect(p);
_ar.CompleteCall();
},
exception => DisplayError("<h2>Unable to connect to twitter, please try again</h2>")
))
return _ar;
}
public class AsyncResult : IAsyncResult
{
private AsyncCallback _cb;
private object _state;
private ManualResetEvent _event;
private bool _completed = false;
private object _lock = new object();
public AsyncResult(AsyncCallback cb, object state)
{
_cb = cb;
_state = state;
}
public Object AsyncState
{
get { return _state; }
}
public bool CompletedSynchronously
{
get { return false; }
}
public bool IsCompleted
{
get { return _completed; }
}
public WaitHandle AsyncWaitHandle
{
get
{
lock (_lock)
{
if (_event == null)
_event = new ManualResetEvent(IsCompleted);
return _event;
}
}
}
public void CompleteCall()
{
lock (_lock)
{
_completed = true;
if (_event != null)
_event.Set();
}
if (_cb != null)
_cb(this);
}
}