C#中无边框窗体移动

拖动无边框窗体Form至桌面任何位置

首先建一个Windows应用程序
将Form1的 FormBorderStyle属性设置为Noe

  Point mouseOff;//鼠标移动位置变量
         bool leftFlag;//标记是否为左键
         private void Form1_MouseDown(object sender, MouseEventArgs e)
         {
             if (e.Button == MouseButtons.Left)
             {
                 mouseOff = new Point(-e.X, -e.Y); //得到变量的值
                 leftFlag = true;                  //点击左键按下时标注为true;
             }
         }

         private void Form1_MouseMove(object sender, MouseEventArgs e)
         {
             if (leftFlag)
             {
                 Point mouseSet = Control.MousePosition;
                 mouseSet.Offset(mouseOff.X, mouseOff.Y);  //设置移动后的位置
                 Location = mouseSet;
             }
         }

         private void Form1_MouseUp(object sender, MouseEventArgs e)
         {
             if (leftFlag)
             {
                 leftFlag = false;//释放鼠标后标注为false;
             }
         }