c# - HttpWebResponse GetResponseStream 卡在 Dispose 中

Question

我正在使用 HttpWebResponse.GetResponseStream 访问互联网广播流，并希望从响应流中读取一些数据，然后断开连接。但是，我总是无限期地卡在流的 Dispose 上。下面的单元测试将显示“Cleaning up networkStream...”，但永远不会显示“Finished”。为什么是这样？我是否应该通过不去处理我的 networkStream 来解决它？

[Test]
public void CanStreamMP3Radio()
{
    string url = @"http://radio.reaper.fm/stream/";
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

    int total = 0;
    byte[] buffer = new byte[1024];

    using(var networkStream = resp.GetResponseStream())
    {
        do
        {
            int bytesRead = networkStream.Read(buffer, 0, buffer.Length);
            Console.WriteLine("{0} bytesRead", bytesRead);
            total += bytesRead;
        } while (total < 16384);
        Console.WriteLine("Cleaning up networkStream...");
    }
    Console.WriteLine("Finished");
}

Answer 1

编辑:刚刚找到一个解决方案...在 using block 结束之前调用 req.Abort()。不是很优雅，但它可以工作......所以代码变成:

[Test]
public void CanStreamMP3Radio()
{
    string url = @"http://radio.reaper.fm/stream/";
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
    {
        int total = 0;
        byte[] buffer = new byte[1024];

        var networkStream = resp.GetResponseStream();
        do
        {
            int bytesRead = networkStream.Read(buffer, 0, buffer.Length);
            Console.WriteLine("{0} bytesRead", bytesRead);
            total += bytesRead;
        } while (total < 16384);
        Console.WriteLine("Cleaning up HttpWebResponse...");
        req.Abort();
    }
    Console.WriteLine("Finished");
}

---

尝试处理 HttpWebResponse:

[Test]
public void CanStreamMP3Radio()
{
    string url = @"http://radio.reaper.fm/stream/";
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
    {
        int total = 0;
        byte[] buffer = new byte[1024];

        var networkStream = resp.GetResponseStream();
        do
        {
            int bytesRead = networkStream.Read(buffer, 0, buffer.Length);
            Console.WriteLine("{0} bytesRead", bytesRead);
            total += bytesRead;
        } while (total < 16384);
        Console.WriteLine("Cleaning up HttpWebResponse...");
    }
    Console.WriteLine("Finished");
}

它也应该处理 NetworkStream。