C#中實現拖動無邊框窗體Form

Point mouseOff;//鼠標移動位置變量
            bool leftFlag;//標簽是否為左鍵
            private void Form1_MouseDown(object sender, MouseEventArgs e)
            {
                if (e.Button == MouseButtons.Left)
                {
                    mouseOff = new Point(-e.X, -e.Y); //得到變量的值
                    leftFlag = true;                  //點擊左鍵按下時標注為true;
                }
            }

            private void Form1_MouseMove(object sender, MouseEventArgs e)
            {
                if (leftFlag)
                {
                    Point mouseSet = Control.MousePosition;
                    mouseSet.Offset(mouseOff.X, mouseOff.Y);  //設置移動後的位置
                    Location = mouseSet;
                }
            }

            private void Form1_MouseUp(object sender, MouseEventArgs e)
            {
                if (leftFlag)
                {
                    leftFlag = false;//釋放鼠標後標注為false;
                }
            }

第二種方法實現

[DllImport("user32.dll")]//*********************拖動無窗體的控件
 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;
 

下面再你要拖動觸發的控件裡面寫上這句話

private void gPanelTitleBack_MouseDown(object sender, MouseEventArgs e)
 {
 ReleaseCapture();
 SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);//*********************調用移動無窗體控件函數
 }