C# UWP HttpWebResponse 分块

Question

我在读取流响应时遇到问题，因为我无法读取结束响应。

这是来自服务器的响应：

 Server : "Apache-Coyote/1.1"
 Transfer-Encoding : "chunked"
 Content-Type: "multipart/mixed; boundary=F34D3847AEDEB14FF5967BF7426EECF6"

我尝试阅读此回复：

var response = (HttpWebResponse)await httpWebRequest.GetResponseAsync();
using(var read = new StreamReader(response.GetResponseStream())
 {
   var result = await read.ReadToEndAsync();
 }

还有这个方法：

StringBuilder sb = new StringBuilder();
Byte[] buf = new byte[8192];
Stream resStream = response.GetResponseStream();
string tmpString = null;
int count = 0;
do
{
count = resStream.Read(buf, 0, buf.Length);
if(count != 0)
{
      tmpString = Encoding.ASCII.GetString(buf, 0, count);
      sb.Append(tmpString);
}
}while (count > 0);

错误信息：

Exception from HRESULT: 0x80072EE4
I/O error occurred.
Exception thrown: 'System.IO.IOException' in mscorlib.ni.dll
Exception thrown: 'System.IO.IOException' in mscorlib.ni.dll

不幸的是，它不起作用，只得到响应的片段。谢谢你的帮助

Answer 1

我测试了您的代码，对于您采用的第一种方法，我运行良好，我只是在其中添加了一个 Dispose()。而对于第二种方法，我认为可能是你没有得到你的 var response 的ContentLength 的问题。

这是我的代码，代码中注释的部分是第一种方法，我拿了一个Button Click事件来处理这个：

  public async void HTTP(object sender, RoutedEventArgs e)
        {
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("URL");
            HttpWebResponse response = (HttpWebResponse)await httpWebRequest.GetResponseAsync();
            Stream resStream = response.GetResponseStream();            

            StringBuilder sb = new StringBuilder();

            StreamReader read = new StreamReader(resStream);
            string tmpString = null;
            int count = (int)response.ContentLength;
            int offset = 0;
            Byte[] buf = new byte[count];
            do
            {
                int n = resStream.Read(buf, offset, count);
                if (n == 0) break;
                count -= n;
                offset += n;
                tmpString = Encoding.ASCII.GetString(buf, 0, buf.Length);
                sb.Append(tmpString);
            } while (count > 0);

            text.Text = tmpString;


            read.Dispose();

            //using (StreamReader read = new StreamReader(resStream))
            //{
            //    var result = await read.ReadToEndAsync();
            //    text.Text = result;
            //    read.Dispose();
            //}

            response.Dispose();

        }

我已经测试过了，效果很好。