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   源码介绍

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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;
//Download by http://www.codefans.net
namespace jianbian
{
    public partial class Form1 : Form
    {
        //动画窗体调用，关闭时将向上移除屏幕
        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool AnimateWindow(IntPtr hwnd, int dwTime, int dwFlags);
        const int AW_HOR_POSITIVE = 0x0001;
        const int AW_HOR_NEGATIVE = 0x0002;
        const int AW_VER_POSITIVE = 0X0004;
        const int AW_VER_NEGATIVE = 0x0008;
        const int AW_CENTER = 0x0010;
        const int AW_HIDE = 0x10000;
        const int AW_ACTIVATE = 0x20000;
        const int AW_SLIDE = 0x40000;
        const int AW_BLEND = 0x80000;

        public Form1()
        {
            InitializeComponent();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            //让背景由0变到1
            if (this.Opacity < 1)
            {
                this.Opacity = this.Opacity   0.05;
            }
            else
            {
                this.timer.Enabled = false;
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            AnimateWindow(this.Handle, 1000, AW_SLIDE | AW_HIDE | AW_VER_NEGATIVE);
            Application.Exit();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //动画由小渐大
            AnimateWindow(this.Handle, 1000, AW_CENTER | AW_ACTIVATE);
            //主界面渐变设置
            this.timer.Enabled = true;
            this.Opacity = 0;
        }
    }
}