winform 以不规则图形背景显示窗体

一：创建一个winform窗体，把BackgroundImage引入一个不规则的图片，设置属性BackgroundImageLayout为Stretch

二：主要代码

using System;
using System.Drawing;
using System.Media;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Windows.Forms;

namespace TestDemo
{public partial class Form1 : Form
    {
        bool beginMove = false;
        int currentXPosition;
        int currentYPosition;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.TransparencyKey = Color.White;             //设置默认透明色
            this.BackColor = this.TransparencyKey;          //设置当前窗体的背景色为透明
            this.FormBorderStyle = FormBorderStyle.None;    //隐藏窗体边框
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            //窗体拖拽
            beginMove = true;
            currentXPosition = MousePosition.X;
            currentYPosition = MousePosition.Y;
            this.Refresh();
        }

        private void Form1_MouseLeave(object sender, EventArgs e)
        {
            //设置初始状态
            currentXPosition = 0;
            currentYPosition = 0;
            beginMove = false;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (beginMove)
            {
                //根据鼠标X坐标确定窗体X坐标
                this.Left += MousePosition.X - currentXPosition;
                //根据鼠标Y坐标确定窗体Y坐标
                this.Top += MousePosition.Y - currentYPosition;
                currentXPosition = MousePosition.X;
                currentYPosition = MousePosition.Y;
            }
           
        }
        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            beginMove = false;
        }
        private void Form1_Click(object sender, EventArgs e)
        {
            try
            {
                SoundPlayer player = new SoundPlayer();
                player.SoundLocation = Application.StartupPath + "\BIGBANG.wav";
                player.Load();
                player.Play();
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);
            }
        }
    }
}

三：下载地址   

点击下载 提取码：yd14