为了美观，去掉窗体的标题栏，给窗体的FormBorderStyle属性设置为None，这时，使用鼠标拖动和缩放窗口就会失效。下面几种简单方法来恢复所需效果。

鼠标的拖动

• 注册 窗体的MouseDown 和MouseMove事件，通过设置窗体的Location来实现移动。（较简单，不需要添加其他元素）

public partial class FmMain : Form {
        private Point formPoint = new Point();

        public FmMain() {
            InitializeComponent();
        }

        private void FmMain_MouseMove(object sender, MouseEventArgs e) {
            if (e.Button == MouseButtons.Left) {
                Point myPosittion = MousePosition;
                myPosittion.Offset(-formPoint.X, -formPoint.Y);
                Location = myPosittion;
            }
        }

        private void FmMain_MouseDown(object sender, MouseEventArgs e) {
            formPoint.X = e.X;
            formPoint.Y = e.Y;
        }
}

• 设置一个透明的 panel 置于底层，通过设置 panel 的MouseDown 和MouseMove事件，来实现窗体的拖动。（多添加了一个元素，实现方式和第一种差不多）

public partial class FmMain : Form {
        private Point mousePoint = new Point();

        public FmMain() {
            InitializeComponent();
        }

        private void panelMain_MouseDown(object sender, MouseEventArgs e) {
            base.OnMouseDown(e);
            this.mousePoint.X = e.X;
            this.mousePoint.Y = e.Y;
        }

        private void panelMain_MouseMove(object sender, MouseEventArgs e) {
            base.OnMouseMove(e);
            if (e.Button == MouseButtons.Left) {
                this.Top = Control.MousePosition.Y - mousePoint.Y;
                this.Left = Control.MousePosition.X - mousePoint.X;
            }
        }
 }

网上还有其他方法，相比较这两种稍微有点复杂。