Question

我显示错误：

'Timer' is an ambiguous reference between 'System.Windows.Forms.Timer' and 'System.Threading.Timer'

当我添加时钟

的代码时

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
using System.Security.Cryptography;


namespace SocketClient
{

    public partial class SocketClient : Form
    {
        System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
        NetworkStream serverStream = default(NetworkStream);
        string readData = null;


        public SocketClient()
        {
            InitializeComponent();
            Timer timer = new Timer();
            timer.Tick += new EventHandler(TimerOnTick);
            timer.Interval = 1000;
            timer.Start();
        }



        private void TimerOnTick(object sender, EventArgs ea)
        {
            Invalidate();
        }

        protected override void OnPaint(PaintEventArgs pea)
        {
            StringFormat strfmt = new StringFormat();
            strfmt.Alignment = StringAlignment.Far;
            strfmt.LineAlignment = StringAlignment.Far;

            pea.Graphics.DrawString(DateTime.Now.ToString("F"),
            Font, new SolidBrush(ForeColor),
            ClientRectangle, strfmt);

        }

        private void getMessage()
        {
            while (true)
            {
                serverStream = clientSocket.GetStream();
                int buffSize = 0;
                byte[] inStream = new byte[10025];
                buffSize = clientSocket.ReceiveBufferSize;
                serverStream.Read(inStream, 0, buffSize);
                string returndata = System.Text.Encoding.ASCII.GetString(inStream);
                readData = "" + returndata;
                msg();
            }
        }


        private void msg()
        {
            if (this.InvokeRequired)
                this.Invoke(new MethodInvoker(msg));
            else
                textDisplay.Text = textDisplay.Text + Environment.NewLine + " >> " + readData;
        }


        private void buttonConnect_Click(object sender, EventArgs e)
        {


            // show the message if no input is enter.
            if (string.IsNullOrEmpty(textName.Text) || string.IsNullOrEmpty(textPort.Text) || string.IsNullOrEmpty(textIP.Text))
            {
                MessageBox.Show("Please enter Name, IP Address & Port #");
            }
            else
            {
                //connect to the server if all 3 input is enter
                readData = "Conected to NYP Server ...";
                msg();

                clientSocket.Connect(textIP.Text, Convert.ToInt32(textPort.Text));
                serverStream = clientSocket.GetStream();

                byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textName.Text + "$");
                serverStream.Write(outStream, 0, outStream.Length);
                serverStream.Flush();

                Thread ctThread = new Thread(getMessage);
                ctThread.Start();


            }
        }

        private void buttonSend_Click(object sender, EventArgs e)
        {
            // Show msg box if no server is connected
            if (serverStream == null)
            {
                MessageBox.Show("Please connect to a server first!");
                return;
            }

            // Send text
            byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textSend.Text + "$");
            serverStream.Write(outStream, 0, outStream.Length);
            serverStream.Flush();

            // Clear text
            textSend.Text = "";

        }

        private void textDisplay_TextChanged(object sender, EventArgs e)
        {
            textDisplay.SelectionStart = textDisplay.Text.Length;
            textDisplay.ScrollToCaret();
            textDisplay.Refresh();
        }

        private void textSend_TextChanged(object sender, EventArgs e)
        {
            buttonSend.Enabled = !string.IsNullOrEmpty(textSend.Text);
        }
    }
}

Answer 1

这里有各种选择：

使用别名：

using UITimer = System.Windows.Forms.Timer;

...
UITimer timer = new UITimer();

使用完全限定名称：

System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();

使用命名空间别名：

using WinForms = System.Windows.Forms;
...
WinForms::Timer timer = new WinForms::Timer();

但是，我个人建议从网络代码中拆分用户界面代码 - 此时不太可能出现问题。

我还会注意到你正在从流中读取而不考虑返回值 - 这是一个坏主意，因为你不知道有多少缓冲区确实包含新数据。

Answer 2

问题是你是

using System.Windows.Forms;
using System.Threading;

这两个命名空间都有一个Timer类，编译器无法判断使用哪个。声明Timer时，请使用全名：

System.Windows.Forms.Timer

或

System.Threading.Timer

WinForms Timer Class

Threading Timer Class

根据您对课程的使用情况，我认为您需要System.Windows.Forms.Timer，如下所示：

    public SocketClient() 
    { 
        InitializeComponent(); 
        var timer = new System.Windows.Forms.Timer(); 
        timer.Tick += new EventHandler(TimerOnTick); 
        timer.Interval = 1000; 
        timer.Start(); 
    }

'Timer'错误是'System.Windows.Forms.Timer'和'System.Threading.Timer'之间的模糊引用

2 个答案: