winform 无边框窗体内toppanel midpanel bottompanel 填充，怎么拖动改变窗体大小

Question

无边框窗体还要用winform啊……赶紧换WPF吧

Answer 1

[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;
  
   private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
   {
    ReleaseCapture();
    SendMessage(this.Handle,WM_SYSCOMMAND,SC_MOVE+HTCAPTION, 0); 
   }