C# NetworkStream.ReadAsync的ReadTimeout

任务什么时候完成？一旦接收到指定长度的数据

如果是，它是否返回0？然后可以将用作属性，该属性仅可用于同步操作，对吗？

ReadAsync（）将自行“超时”。如果要取消，请使用CancellationToken。如果基础套接字关闭，ReadAsync（）将立即返回0

ReadAsync一有数据就会返回，可能是1字节。它不会等到缓冲区已满

    static async Task StartTcpClientAsync(TcpClient tcpClient)
    {
        Console.WriteLine($"Connection from: [{tcpClient.Client.RemoteEndPoint}]");

        var stream = tcpClient.GetStream();
        var buffer = new byte[1024];

        while (true)
        {
            int x = await stream.ReadAsync(buffer, 0, 1024);
            Console.WriteLine($"[{tcpClient.Client.RemoteEndPoint}] _ " +
                $"read {x} bytes {System.Text.Encoding.UTF8.GetString(buffer)}");
        }
    }
    static async Task StartTcpServerAsync()
    {
        var tcpListener = new TcpListener(new IPEndPoint(IPAddress.Any, 9999));
        tcpListener.Start();
        while (true)
        {
            var tcpClient = await tcpListener.AcceptTcpClientAsync();
            _ = StartTcpClientAsync(tcpClient);
        }
    }
    static async Task Main(string[] args)
    {
        _ = StartTcpServerAsync();
        await Task.Delay(2000);
        await RunSenderAsync();
    }
    static async Task RunSenderAsync()
    {
        var tcpClient = new TcpClient("127.0.0.1", 9999);
        var s = tcpClient.GetStream();
        tcpClient.NoDelay = true;
        for (var i = 65; i < 91; i++)
        {
            s.Write(BitConverter.GetBytes(i), 0, 1);
            await Task.Delay(1000);
        }
    }

---

我假设

ReadAsync

在达到时间限制时会像

Read

一样失败，并出现

IOException

。我认为

ReadTimeout

的文档不完整。但是我可能错了，很遗憾，我现在无法证实我的说法。你可以对Read（）或ReadAsync（）进行研究，但它们都不会自己超时。如果底层套接字被拆除，由对等设备或其他中间设备（如有状态防火墙）重置，您将得到IOException。

[127.0.0.1:65201] read 1 bytes A
[127.0.0.1:65201] read 1 bytes B
[127.0.0.1:65201] read 1 bytes C 
[127.0.0.1:65201] read 1 bytes D
[127.0.0.1:65201] read 1 bytes E
[127.0.0.1:65201] read 1 bytes F
...