C#如何在单独的类和线程中从静态方法更改textbox.Text

时间:2017-11-29 23:25:48

标签: c# multithreading class sockets static-methods

所以我遇到的问题是我想在Form1上设置textbox.Text。我很快发现了线程安全,我认为代码我修复了这个问题。我面临的下一个问题是我的客户端编码的方式设置文本的方法必须是静态的,我不能想到如何做到这一点。当然,除非我的AsyncClient类中的客户端方法不必是静态的,如果是这种情况,并且由于我缺乏知识,那将是非常好的。

我正在为客户重新设计Microsoft的模板,因为您可能会知道。这主要是因为我是一名大学生,我现在只是用它来学习。

如果这个问题已经存在,我还想提前道歉,但是当我看起来我找不到任何具体到我的问题。

这是代码的顶部部分减去命名空间。我会稍微分开一下,只关注我所说的部分。

    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    Socket client;

    public delegate void setTextCallback(string text);

    public void setText(string text)
    {
        if (this.txtLog.InvokeRequired)
        {
            // Different thread, use Invoke.
            setTextCallback d = new setTextCallback(FinishSetText);
            this.Invoke(d, new object[] { text });
        }
        else
        {
            // Same thread, no Invoke.
            this.txtLog.Text = this.txtLog.Text + text;

        }
    }

    private void FinishSetText(string text)
    {
        this.txtLog.Text = this.txtLog.Text + text;
    }

以上是代码,只要错误得到修复我遇到的交叉问题。如果有更好的方法可以做到这一点,我就会尝试新事物。

    // State object for receiving data from remote device.  
    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(); 
    }

    public class AsyncClient
    {
        // The port number for the remote device.  
        private const int port = 8080;

        // ManualResetEvent instances signal completion.  
        private static ManualResetEvent connectDone =
            new ManualResetEvent(false);
        private static ManualResetEvent sendDone =
            new ManualResetEvent(false);
        private static ManualResetEvent receiveDone =
            new ManualResetEvent(false);

        public struct properties
        {
            public static String response { get; set; }
        }

        public static Socket StartClient()
        {
            IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
            // Create a TCP/IP socket.  
            Socket client = new Socket(ipAddress.AddressFamily,
                SocketType.Stream, ProtocolType.Tcp);

            // Connect to a remote device.  
            try
            {
                // Establish the remote endpoint for the socket.  

                IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);

                // Connect to the remote endpoint.  
                client.BeginConnect(remoteEP,
                    new AsyncCallback(ConnectCallback), client);
                connectDone.WaitOne();

                // Release the socket.  
                client.Shutdown(SocketShutdown.Both);
                client.Close();

                return client;
            }
            catch (Exception e)
            {

                setText(e.ToString()); 
                return client;
            }
        }

        private static void ConnectCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete the connection.  
                client.EndConnect(ar);

                setText(string.Format("Socket connected to {0}",
                    client.RemoteEndPoint.ToString()));

                // Signal that the connection has been made.  
                connectDone.Set();
            }
            catch (Exception e)
            {
                setText(e.ToString());
            }
          //Other AsyncClient methods below.
        }

在代码底部的上方,您可以看到我尝试使用Form1中的方法设置文本的位置,但您也可以看到方法是静态的,这意味着它需要该方法的静态版本,这意味着使用{{ 1}}不再起作用,或者至少这是我对正在发生的事情的理解。任何帮助将非常感激。

1 个答案:

答案 0 :(得分:1)

删除static个关键字并将此代码添加到AsyncClient课程的开头:

public class AsyncClient
{
    private Action<string> setText;

    public AsyncClient(Action<string> setText)
    {
        this.setText = setText;
    }

然后,当您从表单中创建实例时,请执行var ac = new AsyncClient(setText)并致电ac.StartClient()