C#接收异步错误

本文关键字：错误 异步 | 更新日期: 2023-09-27 17:58:51

我目前正在开发一个应用服务器。我想使用AcceptAsync方法。调用ReceiveAsync方法时，我收到错误"Object reference not set to instance of Object。"。如果有人想出这个问题并找到了解决方案？

public class AppServer
{
    public void Start()
    {
        Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        serverSocket.Bind(new IPEndPoint(IPAddress.Any, 12345));
        serverSocket.Listen(100);
        SocketAsyncEventArgs e = new SocketAsyncEventArgs();
        e.Completed += new EventHandler<SocketAsyncEventArgs>(e_Completed);
        bool raiseEvent = serverSocket.AcceptAsync(e);
        if (!raiseEvent)
            AcceptCallback(e);
    }
    void e_Completed(object sender, SocketAsyncEventArgs e)
    {
        AcceptCallback(e);
    }
    private void AcceptCallback(SocketAsyncEventArgs e)
    {
        SocketAsyncEventArgs readEventArgs = new SocketAsyncEventArgs();
        readEventArgs.Completed += new EventHandler<SocketAsyncEventArgs>(readEventArgs_Completed);
        Socket clientSocket = e.AcceptSocket;
        bool raiseEvent = clientSocket.ReceiveAsync(readEventArgs); // <-- Error goes here
        if (!raiseEvent)
            ReceiveCallback(readEventArgs);
    }
    void readEventArgs_Completed(object sender, SocketAsyncEventArgs e)
    {
        ReceiveCallback(e);
    }
    private void ReceiveCallback(SocketAsyncEventArgs e)
    {
    }
}

C#接收异步错误

我遇到了同样的问题，我设法解决了。在调用ReceiveAsync（e）之前，您需要向SocketAsyncEventArgs对象提供一个数据缓冲区（字节数组）来存储接收到的数据。

void e_Completed(object sender, SocketAsyncEventArgs e)
{
    byte[] buffer = new byte[1024];
    e.SetBuffer(buffer, 0, buffer.Length);
    AcceptCallback(e);
}

我不知道你为什么在两个地方接受套接字。如果删除

 AcceptCallback(e);

从e_Completed开始，一切正常。

它链接到示例异步服务器：

a链接

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