C#重写窗体的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Mform
{
    public partial class Form1 : Form
    {
        [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 Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
        {
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;//设置窗体默认属性
            base.OnLoad(e);
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, 0x0112, 0xF010 + 0x0002, 0);//调用Api
            base.OnMouseDown(e);
        }
    }
}

此方法重写窗体的