VisualStudio2015，能否在调试的时候模拟慢网速吗？

Question

我们在开发从服务器下载数据的程序，由于网络太快下载过程一下子就结束了，没法分析其过程。

而我用Chrome浏览器去开发网页的时候，他的F12工具自带了一个网速模拟功能，可以将网络模拟为2G/3G等速度，极大方便了开发者。

请问VS2015里面有没有类似的功能？

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da jia hao!

Answer 1

请问你具体是什么应用场景？

可以用线程阻塞的模式来模拟网速慢：

while(m.Read(buffer,0,1024)>0){

Thread.Sleep(1000); //阻塞一秒

}

Answer 2

你好，

同意Johan Shen 的回答，可以通过WebResponse, 来得到下载的数据。请参考下面的代码。

public static int DownloadFile(String remoteFilename, String localFilename)
    {
      // Function will return the number of bytes processed
      // to the caller. Initialize to 0 here.
      int bytesProcessed = 0;

      // Assign values to these objects here so that they can
      // be referenced in the finally block
      Stream remoteStream = null;
      Stream localStream = null;
      WebResponse response = null;

      // Use a try/catch/finally block as both the WebRequest and Stream
      // classes throw exceptions upon error
      try
      {
        // Create a request for the specified remote file name
        WebRequest request = WebRequest.Create(remoteFilename);
        if (request != null)
        {
          // Send the request to the server and retrieve the
          // WebResponse object 
          response = request.GetResponse();
          if (response != null)
          {
            // Once the WebResponse object has been retrieved,
            // get the stream object associated with the response's data
            remoteStream = response.GetResponseStream();

            // Create the local file
            localStream = File.Create(localFilename);

            // Allocate a 1k buffer
            byte[] buffer = new byte[1024];
            int bytesRead;

            // Simple do/while loop to read from stream until
            // no bytes are returned
            do
            {
              // Read data (up to 1k) from the stream
              bytesRead = remoteStream.Read(buffer, 0, buffer.Length);

              // Write the data to the local file
              localStream.Write(buffer, 0, bytesRead);

              // Increment total bytes processed
              bytesProcessed += bytesRead;
              Thread.Sleep(1000); //阻塞一秒
            } while (bytesRead > 0);
          }
        }
      }
      catch (Exception e)
      {
        Console.WriteLine(e.Message);
      }
      finally
      {
         if (response != null) response.Close();
        if (remoteStream != null) remoteStream.Close();
        if (localStream != null) localStream.Close();
      }

      // Return total bytes processed to caller.
      return bytesProcessed;
    }

Best regards,

Cole Wu

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Answer 3

这种方法我也会，也用过，但是很不好用。我很奇怪vs作为一个老牌开发工具，为何这个基本功能都没有。。。

用过chrome浏览器F12的开发人员就会知道如果开发工具本身提供这个功能，是一个多么美妙的事情。

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da jia hao!