.NET线程 - HttpWebRequest BeginGetResponse + AutoResetEvent

Question

我想知道哪两种方法是更好的实现？ 我需要创建一个范围在200ms到5秒之间的Web请求。我需要html响应继续 - 所以需要在主线程上阻塞。

第一种方法

string GetResponse() 
{ 

    HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); 
    IAsyncResult result = request.BeginGetResponse(null, null);  

using (HttpWebResponse httpResponse = (HttpWebResponse)request.EndGetResponse(result)) 
{ 
    using (Stream dataStream = httpResponse.GetResponseStream()) 
    { 
     StreamReader reader = new StreamReader(dataStream); 
     response = reader.ReadToEnd(); 
    } 
} 

第二种方法

string response = string.Empty; 
AutoResetEvent waitHandle = null; 
void GetResponse(string url) 
{ 
    waitHandle = new AutoResetEvent(false); 
    try 
    { 
     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); 
     IAsyncResult asyncResult = request.BeginGetResponse(Callback, request); 

     waitHandle.WaitOne(); 
    } 
    catch { } 
    finally 
    { 
     waitHandle.Close(); 
    } 
} 

    void Callback(IAsyncResult asyncResult)  
    {   

HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState; 
      try 
      { 
       using (HttpWebResponse httpResponse = (HttpWebResponse)request.EndGetResponse(asyncResult)) 
       { 
        if (httpResponse.StatusCode == HttpStatusCode.OK) 
        { 
         using (Stream dataStream = httpResponse.GetResponseStream()) 
         { 
          StreamReader reader = new StreamReader(dataStream); 
          response = reader.ReadToEnd(); 
         } 
        } 
       } 
      } 
      catch { } 
      finally 
      { 
       waitHandle.Set(); 
      } 
     } 

Answer 1

为什么不执行主线程上的Web请求？如果你想让主线程阻塞，这是迄今为止最简单的方法。