c#实现自动点击鼠标左键（例子）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

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

        [DllImport("User32")]
        public extern static void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo);

        [DllImport("User32")]
        public extern static void SetCursorPos(int x, int y);

        [DllImport("User32")]
        public extern static bool GetCursorPos(out POINT p);

        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int X;
            public int Y;
        }

        public enum MouseEventFlags
        {
            Move = 0x0001,
            LeftDown = 0x0002,
            LeftUp = 0x0004,
            RightDown = 0x0008,
            RightUp = 0x0010,
            MiddleDown = 0x0020,
            MiddleUp = 0x0040,
            Wheel = 0x0800,
            Absolute = 0x8000
        }

        private void AutoClick(int x, int y)
        {
            POINT p = new POINT();
            GetCursorPos(out p);
            try
            {
                SetCursorPos(x, y);
                mouse_event((int)(MouseEventFlags.LeftDown | MouseEventFlags.Absolute), 0, 0, 0, IntPtr.Zero);
                mouse_event((int)(MouseEventFlags.LeftUp | MouseEventFlags.Absolute), 0, 0, 0, IntPtr.Zero);
            }
            finally
            {
                SetCursorPos(p.X, p.Y);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            AutoClick(20, 40);
        }
    }
}