註釋感覺已經很清楚了，有不懂的歡迎評論

 1 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Linq;

 using System.Runtime.InteropServices;

 using System.Text;

 using System.Threading;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace WindowsFormsApp1
 

 {

     public partial class Form1 : Form

     {

         public Form1()

         {

             InitializeComponent();

             this.Hide();

         }

         /// <summary>

         /// 引用user32.dll動態連結庫（windows api），

         /// 使用庫中定義 API：SetCursorPos

         /// </summary>

         [DllImport("user32.dll")]
 

         private static extern int SetCursorPos(int x, int y);

         /// <summary>

         /// 移動滑鼠到指定的座標點

         /// </summary>

         public void MoveMouseToPoint(Point p)

         {

             SetCursorPos(p.X, p.Y);

         }

         /// <summary>

         /// 設定滑鼠的移動範圍

         /// </summary>
 

         public void SetMouseRectangle(Rectangle rectangle)

         {

             System.Windows.Forms.Cursor.Clip = rectangle;

         }

         /// <summary>

         /// 設定滑鼠位於螢幕中心

         /// </summary>

         public void SetMouseAtCenterScreen()

         {

             //當前螢幕的寬高

             int winHeight = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Height;

             int winWidth = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Width;

             //設定滑鼠的x，y位置

             loginx = winWidth /  * ;

             loginy = winHeight /  + ;

             Point centerP = new Point(loginx, loginy);

             //移動滑鼠

             MoveMouseToPoint(centerP);

         }

         //點選事件

         [DllImport("User32")]

         //下面這一行對應著下面的點選事件

         //    public extern static void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo);

         public extern static void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

         public const int MOUSEEVENTF_LEFTDOWN = 0x2;

         public const int MOUSEEVENTF_LEFTUP = 0x4;

         public enum MouseEventFlags

         {

             Move = 0x0001, //移動滑鼠

             LeftDown = 0x0002,//模擬滑鼠左鍵按下

             LeftUp = 0x0004,//模擬滑鼠左鍵抬起

             RightDown = 0x0008,//滑鼠右鍵按下

             RightUp = 0x0010,//滑鼠右鍵抬起

             MiddleDown = 0x0020,//滑鼠中鍵按下

             MiddleUp = 0x0040,//中鍵抬起

             Wheel = 0x0800,

             Absolute = 0x8000//標示是否採用絕對座標

         }

         //滑鼠將要到的x，y位置

         public static int loginx, loginy;

         private void Form1_Load(object sender, EventArgs e)

         {

             //移動滑鼠

             SetMouseAtCenterScreen();

             //mouse_event((int)(MouseEventFlags.LeftDown | MouseEventFlags.Absolute), loginx, loginy, 0, IntPtr.Zero);

             //mouse_event((int)(MouseEventFlags.LeftUp | MouseEventFlags.Absolute), loginx, loginy, 0, IntPtr.Zero);

             //點選兩次

             mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, loginx, loginy, , );

             mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, loginx, loginy, , );

         }

     }

 }