使用AsyncEnumerator

Question

我一直在使用AsyncEnumerator類來幫助清理我的異步代碼。問題在於yield return之後的代碼永遠不會觸發。用戶界面在單擊按鈕時調用一個調用HttpWorker對象的對象。無論點擊多少按鈕，代碼都不會超過收益回報。

public void ReadFromUrl(string Url) 
    { 
     AsyncEnumerator asyncEnum = new AsyncEnumerator(); 
     asyncEnum.BeginExecute(GetData(asyncEnum,Url), asyncEnum.EndExecute); 
    } 

    private IEnumerator<Int32> GetData(AsyncEnumerator AsyncEnum, String Url) 
    { 
     url = Url; 
     request = (HttpWebRequest)WebRequest.Create(url); 

     request.CookieContainer = new CookieContainer(); 
     request.AllowAutoRedirect = true; 
     request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6"; 

     request.BeginGetResponse(AsyncEnum.End(), null); 
     AsyncEnum.SyncContext = null; 
     yield return 1; 

     response = (HttpWebResponse)request.EndGetResponse(AsyncEnum.DequeueAsyncResult()); 


     if (response.StatusCode == HttpStatusCode.OK) 
     { 
      // Create the stream, encoder and reader. 
      Stream responseStream = response.GetResponseStream(); 
      Encoding streamEncoder = Encoding.UTF8; 
      StreamReader responseReader = new StreamReader(responseStream, streamEncoder); 
      responseAsString = responseReader.ReadToEnd(); 
     } 
     else 
     { 
      throw new Exception(String.Format("Response Not Valid {0}", response.StatusCode)); 
     } 

    } 

Answer 1

除了我的調試使用以外沒有任何問題！