当窗体处于屏幕边缘时隐藏窗口的方法

　　当把软件窗口拖动到屏幕边缘时，让软件窗体隐藏，鼠标再次悬浮时再把它显示出来，
　　根据下面的代码给窗体添加一系列事件
　　具体代码如下：using System.Runtime.InteropServices;  namespace 仿QQ侧边隐藏 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }          [DllImport(＂user32.dll＂)]         public static extern bool ReleaseCapture();         [DllImport(＂user32.dll＂)]         public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);         public const int WM_SYSCOMMAND = 0x0112;         public const int SC_MOVE = 0xF010;         public const int HTCAPTION = 0x0002;          //窗体的宽高         int formwidth;         int formheight;                  private void Form1_Move(object sender, EventArgs e)         {             formwidth = this.Width;             formheight = this.Height;             int x = this.Location.X;             int y = this.Location.Y;             if (x <= 0)             {                 this.Location = new System.Drawing.Point(0, y);                 this.Width = 0;             }             if (y <= 0)             {                 this.Location = new System.Drawing.Point(x, 0);                 this.Height = 0;             }         }          private void Form1_MouseEnter(object sender, EventArgs e)         {             this.Width = formwidth;             this.Height = formheight;         }          private void Form1_MouseDown(object sender, MouseEventArgs e)         {             ReleaseCapture();             SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);         }          private void Form1_MouseLeave(object sender, EventArgs e)         {             int nowx = Cursor.Position.X;             int nowy = Cursor.Position.Y;             if (nowx >= (this.Location.X + this.Width) | nowx <= this.Location.X | nowy <= this.Location.Y | nowy >= (this.Location.Y + this.Height))             {                 if (this.Location.X == 0)                 {                     this.Width = 0;                 }                 if (this.Location.Y == 0)                 {                     this.Height = 0;                 }             }         }          private void button1_Click(object sender, EventArgs e)         {             this.Close();         }     } }
　　运行起来会发现效果是这样的：
　　把标题栏去掉
　　再次运行，调试程序，这个图不太好截，有需要的自己试一下吧。