Question

我只是想用一个小的内部套接字客户端/服务器做一个概念验证。我只是传递一个字符串，将收到一个特定的字符串。例如发送 - ＆GT; “UCME”接收 - ＆gt;“ICU”

我一直关注MSDN示例Async Example，并且Synchronous Client按预期工作。但是我实际上想要没有的异步客户端。它结束当前ReceiveCallback，然后无限期挂起。我没有得到错误，没有。唯一的线索是我在F10（ing）退出

后立即看到以下消息

Step into: Stepping over non-user code 'System.Net.LazyAsyncResult.Complete'
Step into: Stepping over non-user code 'System.Threading.ExecutionContext.Run'
Step into: Stepping over non-user code 'System.Threading._IOCompletionCallback.PerformIOCompletionCallback'

有什么想法吗？

private static void Receive(Socket client)
{
    try
    {
        // Create the state object.
        StateObject state = new StateObject();
        state.workSocket = client;

        // Begin receiving the data from the remote device.
        client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
            new AsyncCallback(ReceiveCallback), state);
    }
    catch (Exception e)
    {
        Console.WriteLine(e.ToString());
    }
}
private static void ReceiveCallback(IAsyncResult ar)
{
    try
    {
        // Retrieve the state object and the client socket 
        // from the asynchronous state object.
        StateObject state = (StateObject)ar.AsyncState;
        Socket client = state.workSocket;

        // Read data from the remote device.
        int bytesRead = client.EndReceive(ar);

        if (bytesRead > 0)
        {
            // There might be more data, so store the data received so far.
            state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

            // Get the rest of the data.
            client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReceiveCallback), state);
        }
        else
        {
            // All the data has arrived; put it in response.
            if (state.sb.Length > 1)
            {
                response = state.sb.ToString();
            }
            // Signal that all bytes have been received.
            receiveDone.Set();
        }
    }
    catch (Exception e)
    {
        Console.WriteLine(e.ToString());
    }
}

public class StateObject

{
    // Client socket.
    public Socket workSocket = null;
    // Size of receive buffer.
    public const int BufferSize = 256;
    // Receive buffer.
    public byte[] buffer = new byte[BufferSize];
    // Received data string.
    public StringBuilder sb = new StringBuilder();
}

套接字BeginReceive AsyncCallback问题

0 个答案: