c#可移动不规则窗体

关键代码：

 

设置窗体的FormBorderStyle为None，和TransparencyKey为Fuchsia(为图片背景色)必须和图片背景色一样。

是代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Point mouse_offset;

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                Point mousepos = Control.MousePosition;
                mousepos.Offset(mouse_offset.X,mouse_offset.Y);
                Location = mousepos;
            }
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            mouse_offset = new Point(-e.X,-e.Y);
        }
    }
}