using System; 
using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; 
using System.Windows.Forms; namespace TransForm { 
public partial class Form1 : Form 
{ public Form1() { InitializeComponent(); timer1.Enabled = false; inspeed = 10; outspeed = 10; 
} private System.Windows.Forms.Timer timer1; public System.Windows.Forms.Button button1; 
Windows 窗体设计器生成的代码 private int state;//淡入淡出状态 private double inspeed; private double outspeed; public double InSpeed //淡入速度属性（0---100） { get { return inspeed; } set { inspeed = value; } } public double OutSpeed //淡出速度属性（0---100） { get { return outspeed; } set { outspeed = value; } } private void Form1_Load(object sender, EventArgs e) { state = 0; timer1.Enabled = true; this.Opacity = 0; } private void timer1_Tick(object sender, EventArgs e) { if (state >= 0) { this.Opacity += inspeed/100 ; if (this.Opacity == 1) { timer1.Enabled = false; } } else if (state < 0) { this.Opacity -= outspeed/100 ; if (this.Opacity == 0) { this.Close(); timer1.Enabled = false; } } } public void FormClose()//窗体关闭时，调用此函数实现淡出效果 { state = -1; timer1.Enabled = true; } private void button1_Click(object sender, EventArgs e) { FormClose(); } } }工程类型：Windows用户控件。
工程名称：TransForm。
说明：下载TransForm.dll，令其他的新增窗体继承自此dll文件即可实现C#的可视化继承。
using