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, );//调用Api
             base.OnMouseDown(e);
         }
     }
 }

此方法重写窗体的