C# Winform 使用控件移动窗口

将窗口的FormBorderStyle属性设置为FixedSingle

为窗口添加一个Panel控件,并将Dock属性设置为Top

        private Point point;
        
        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            point = e.Location;
        }
        
        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point pt = Control.MousePosition;
                pt.Offset(-point.X, -point.Y);
                Location = pt;
            }
        }

            this.WindowState = FormWindowState.Minimized;
            this.Invalidate();

            this.WindowState = WindowState == FormWindowState.Maximized ? FormWindowState.Normal : FormWindowState.Maximized;
            this.Invalidate();

            this.Close();

        protected override void OnPaintBackground(PaintEventArgs e)
        {
            base.OnPaintBackground(e);
            Rectangle rect = new Rectangle(0, 0, Width, Height);
            ControlPaint.DrawBorder3D(e.Graphics, rect,Border3DStyle.Flat);
        }

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wparam, int lparam);

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)           
            {
                Capture = false;                
                SendMessage((sender as Control).Handle, 161, 2, 0);          
            }
        }