C＃TcpClient“非连接套接字上不允许该操作。”

Question

我的目标是创建一个保持连接的TcpClient，允许将消息发送到服务器，以及使用定时监视器在特定空闲频率期间向服务器发送特殊消息。在被难倒之前没有做得太远。

使用当前代码，使用控制台测试程序应用程序发送的第一条消息收到罚款，但在发送另一条消息时会抛出异常，并显示消息“非连接套接字上不允许进行操作。”

我尝试删除stream.Dispose（）行，它会在第二次尝试期间挂起在stream.Read（...）上。我还尝试将NetworkStream流作为类的成员并在构造函数中将其设置为client.GetStream（），并在第二次尝试期间挂起在stream.Read（...）上。

public class TcpClientTest
{
    private TcpClient client = new TcpClient();
    private string hostName;
    private int port;

    public TcpClientTest(string hostName, int port)
    {
        this.hostName = hostName;
        this.port = port;
        client.Connect(hostName, port);
    }


    public byte[] SendMessage(string name, string message)
    {
        if (client == null) throw new Exception("Client connection has not been established");

        Person person = new Person();
        person.Name = name; person.Message = message;

        byte[] messageBytes = (System.Text.Encoding.Unicode.GetBytes(Newtonsoft.Json.JsonConvert.SerializeObject(person)));
        const int bytesize = 1024 * 1024;
        try 
        {
            NetworkStream stream = client.GetStream();

            if (stream != null)
            {
                stream.Write(messageBytes, 0, messageBytes.Length); // Write the bytes  

                messageBytes = new byte[bytesize]; // Clear the message   

                // Receive the stream of bytes  
                stream.Read(messageBytes, 0, messageBytes.Length);
            }


            // Clean up  
            stream.Flush();
            stream.Dispose();
        }
        catch (Exception e) 
        {
            Console.WriteLine(e.Message);

        }

        return messageBytes; // Return response  
    }
}

// In console tester app
    static void Main(string[] args)
    {
        TcpClientTest client = new TcpClientTest("127.0.0.1", 1234);

        string exit = "2";
        do
        {
            if (exit == "1") client.SendMessage("TEST", "TEST");              
            Console.WriteLine("1 Send Message 2 Exit");
            exit = Console.ReadLine();
        } while (exit != "2");


    }