thread.abort（）卡在NetworkStream.read上？

Question

我有一个文件传输应用程序（服务器 - 客户端）...发送文件时，我想启用取消。
Client取消它由BackgroundWorker工作的SendFile方法，然后它将命令发送到服务器以取消其接收线程。
当服务器接收此命令时，它调用停止方法但它卡在该行 network.read（数据，0，data.length）中粘贴在该行中;

如何中止这个线程并转到最终而不困扰着network.read（..）??
提前谢谢。

Thread thTransferFile = null;

void Start()
{
    thTransferFile = new Thread(unused => ft.Receive(destPath, Convert.ToInt64(fileSize);
    thTransferFile.Start();
}

void Stop()
{
    thTransferFile.Abort();
}


public void Receive(string destPath, long fileSize)
    {
        using (fs = new FileStream(destPath, FileMode.Create, FileAccess.Write))
        {
            try
            {
                int count = 0;
                long sum = 0;
                data = new byte[packetSize];
                while (sum < fileSize)
                {
                    count = network.Read(data, 0, data.Length);   //thread stucks in this line when i abort it
                    fs.Write(data, 0, count);
                    sum += count;
                }
            }
            finally
            {
                network.Write(new byte[1], 0, 1); //tell client that the file transfer ends
                network.Flush();
                fs.Dispose();
                if (Thread.CurrentThread.ThreadState == ThreadState.AbortRequested)
                {
                    File.Delete(destPath);
                }
            }
      }

.

Answer 1

i've found a solution when i cancel sending from client side .. the network.DataAvailable set to false .. so i added this line to my receive method in the server

in the while loop:

                while (sum < fileSize)
                {
                    if (network.DataAvailable)
                    {
                        count = network.Read(data, 0, data.Length);
                        fs.Write(data, 0, count);
                        sum += count;
                    }
                }

so it will never stuck at network.Read anymore. it totally worked

Answer 2

Instead of aborting the thread, Close() the network. It will throw the exception like you are expecting.

Killing threads is a big no-no, since there are resources that can be left uncleaned...

Answer 3

NetworkStream.Read is blocked until it receives data. Set a timeout on the read operation by using NetworkStream's ReadTimeoutRead the community comment. Also, you may want to reconsider using Abort() to kill your thread. Add a boolean flag in your while loop, and set that flag to false when Stop() is called. This stop flag, combined with a ReadTimeout will ensure that your program eventually exits.

The thread that calls Abort might block if the thread that is being aborted is in a protected region of code, such as a catch block, finally block, or constrained execution region. If the thread that calls Abort holds a lock that the aborted thread requires, a deadlock can occur.