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windows桌面雪花下落效果，开启程序后，在windows桌面会有雪花从上往下落下的效果
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace Snow
{
public partial class Form1 : Form
{
private s
