如何在c#中从相同表单中的方法访问表单控制

本文关键字：表单 方法 访问 控制 访问表 | 更新日期: 2023-09-27 18:17:09

我的服务器表单接受来自客户端的连接请求，然后我需要在名为lstIP的列表框中添加连接客户端的ip地址。但是我无法从OnClientConnect方法访问lstp。我很感激你的帮助。下面是代码:

public partial class Form1 : Form
    {
        public int cpuLoad;
        private PerformanceCounter cpuCounter;
      static  public string curIP;
       public static string get_localip = GetLocalIP();
        public Form1()
        {
            InitializeComponent();
            InitialiseCPUCounter();
            timer1.Start();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            lblServerIP.Text += " "+get_localip;
        }
          private static TcpListener _listener;
           public static void StartServer() 
    {
         System.Net.IPAddress localIPAddress = System.Net.IPAddress.Parse(get_localip);
        IPEndPoint ipLocal = new IPEndPoint(localIPAddress, 8888);
        _listener = new TcpListener(ipLocal);
        _listener.Start();
        WaitForClientConnect();
    }
    private static void WaitForClientConnect()
    {
        object obj = new object();
        _listener.BeginAcceptTcpClient(new System.AsyncCallback(OnClientConnect), obj);
    }
    public static void OnClientConnect(IAsyncResult asyn)
    {
        try
        {
            TcpClient clientSocket = default(TcpClient);
           // Socket sck;

            clientSocket = _listener.EndAcceptTcpClient(asyn);
         IPAddress add= IPAddress.Parse(((IPEndPoint)clientSocket.Client.RemoteEndPoint).Address.ToString());
         curIP = add.ToString();
          Form1 myform=new Form1();
          myform.items.add("client connectes with ip:"+curIP);
          **// lstIP.items.add("client connected with ip"+curIP); 
        // MessageBox.Show("cleint connected with ip:"+ curIP);**
            HandleClientRequest clientReq = new HandleClientRequest(clientSocket);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        WaitForClientConnect();
    }
    public void btnStart_Click(object sender, EventArgs e)
    {
        StartServer();

    }
    private void InitialiseCPUCounter()
    {
        cpuCounter = new PerformanceCounter(
        "Processor",
        "% Processor Time",
        "_Total",
        true
        );
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
        cpuLoad = Convert.ToInt32(cpuCounter.NextValue());
        this.txtCPUusage.Text =
 cpuLoad.ToString() +
 "%";
    }
  static  public string GetLocalIP()
    {
        IPHostEntry host;
        host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (IPAddress ip in host.AddressList)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                return ip.ToString();
            }
        }
        return "127.0.0.1";
    }
}
    }

如何在c#中从相同表单中的方法访问表单控制

我明白了。你在一个static方法中。如果没有对象的引用，就不能访问静态成员中的实例字段。

我的意思是你需要像

这样的东西
myForm.lstIP.items.add("client connected with ip"+curIP);

但是，我建议你避免静态，并使所有的方法实例，然后一切都会很好。

还要注意OnClientConnect将在工作线程中被调用，所以你不能在那里更新UI。参考如何从c#中的另一个线程更新GUI ?查看更多信息。

注意:请张贴你得到的错误，并提及它是否是编译时错误或运行时异常。我无法访问XXX， 不能工作对我们理解问题没有帮助。堆栈溢出问题检查表<人力资源>

完整的代码如下:

public partial class Form1 : Form
{
    public int cpuLoad;
    private PerformanceCounter cpuCounter;
    static public string curIP;
    public static string get_localip = GetLocalIP();
    public Form1()
    {
        InitializeComponent();
        InitialiseCPUCounter();
        timer1.Start();
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        lblServerIP.Text += " " + get_localip;
    }
    private TcpListener _listener;
    public void StartServer()
    {
        System.Net.IPAddress localIPAddress = System.Net.IPAddress.Parse(get_localip);
        IPEndPoint ipLocal = new IPEndPoint(localIPAddress, 8888);
        _listener = new TcpListener(ipLocal);
        _listener.Start();
        WaitForClientConnect();
    }
    private void WaitForClientConnect()
    {
        object obj = new object();
        _listener.BeginAcceptTcpClient(new System.AsyncCallback(OnClientConnect), obj);
    }
    public void OnClientConnect(IAsyncResult asyn)
    {
        try
        {
            TcpClient clientSocket = default(TcpClient);
            // Socket sck;
            clientSocket = _listener.EndAcceptTcpClient(asyn);
            IPAddress add = IPAddress.Parse(((IPEndPoint)clientSocket.Client.RemoteEndPoint).Address.ToString());
            curIP = add.ToString();
            //Use this.Invoke or this.BeginInvoke
            this.Invoke(new Action(() =>
            {
                lstIP.items.add("client connected with ip" + curIP);
                MessageBox.Show("cleint connected with ip:" + curIP);
            }));
            HandleClientRequest clientReq = new HandleClientRequest(clientSocket);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        WaitForClientConnect();
    }
    public void btnStart_Click(object sender, EventArgs e)
    {
        StartServer();
    }
    private void InitialiseCPUCounter()
    {
        cpuCounter = new PerformanceCounter(
        "Processor",
        "% Processor Time",
        "_Total",
        true
        );
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
        cpuLoad = Convert.ToInt32(cpuCounter.NextValue());
        this.txtCPUusage.Text = cpuLoad.ToString() + "%";
    }
    static public string GetLocalIP()
    {
        IPHostEntry host;
        host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (IPAddress ip in host.AddressList)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                return ip.ToString();
            }
        }
        return "127.0.0.1";
    }
}
相关文章：