如何检查连接是否打开

Question

当我试图避免使用Thread.sleep(400) 我的代码时遇到问题，如下所示：

System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
clientSocket = Connect(IP, Port);
Thread.Sleep(400);

NetworkStream networkStream = clientSocket.GetStream();
Send(networkStream, "My Data To send");
networkStream.Flush();

和我的 send() 方法：

public static void Send(NetworkStream networkStream, string Data)
{
    int range = 1000;
    int datalength = 0;
    foreach (string data in Enumerable.Range(0, Data.Length / range).Select(i => Data.Substring(i * range, range)))
    {
        byte[] outStream = System.Text.Encoding.ASCII.GetBytes(data);
        networkStream.Write(outStream, 0, outStream.Length);
        datalength = datalength + range;
        Thread.Sleep(50);
    }
    byte[] LastoutStream = System.Text.Encoding.ASCII.GetBytes(Data.Substring(datalength, Data.Length - datalength) + "$EOS$\r\n");
    networkStream.Write(LastoutStream, 0, LastoutStream.Length);
}

连接方法：

 protected static System.Net.Sockets.TcpClient Connect(string Ip, int Onport)
    {
        //start connection
        System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
        try
        {
            clientSocket.Connect(Ip, Onport);
        }
        catch
        {
            clientSocket.Connect("LocalHost", Onport);
        }
        return clientSocket;
    }

有没有办法检查流是否准备好使用？

Answer 1

尽管您的代码正在运行，但我想指出有关流的这些内容

GetStream()仅在两种情况下返回异常，这些异常是（来源）：

1. InvalidOperationException - TcpClient 未连接到远程主机。

2. ObjectDisposeException - TcpClient 已关闭。

因此，如果您满足这两个条件，您的流应该可用

出于与对方代码中存在错误相同的原因，在代码中编写异常逻辑总是好的。

在您自己的connect()方法中，您应该找出异常并通知被调用函数连接不成功，或者将异常抛出回调用方函数并使用 try catch 来处理它。因此，在成功的情况下，您将始终获得流媒体。

try{
System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
clientSocket = Connect(IP, Port);
//Thread.Sleep(400);

NetworkStream networkStream = clientSocket.GetStream();
Send(networkStream, "My Data To send");
networkStream.Flush();
}catch(Exception E)
{
 //Log
 //Its always best to catch the actual exception than general exception
 //Handle gracefully
}

Connect 方法，或者您可以忽略异常以回退到调用者

 protected static System.Net.Sockets.TcpClient Connect(string Ip, int Onport)
    {
        //start connection
        System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
        try
        {
            clientSocket.Connect(Ip, Onport);
        }
        catch
        {
            //clientSocket.Connect("LocalHost", Onport);
            throw;
        }
        return clientSocket;
    }