Winform 的淡入淡出效果

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Text;  
using System.Windows.Forms;  
 
namespace WindowsFormsApplication2  
{  
    public partial class Form1 : Form  
    {  
        public Form1()  
        {  
            InitializeComponent();  
        }  
 
        private void Form1_Load(object sender, EventArgs e)  
        {  
            this.Opacity = 0;  
            Timer tStart = new Timer();  
            tStart.Interval = 10;  
            tStart.Tick += new EventHandler(tStart_Tick);  
            tStart.Start();  
        }  
 
        void tStart_Tick(object sender, EventArgs e)  
        {  
            this.Opacity += 0.01;  
            if (this.Opacity == 1)  
                ((Timer)sender).Stop();  
        }  
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)  
        {  
            if (this.Opacity > 0)  
                e.Cancel = true;  
            Timer tClose = new Timer();  
            tClose.Interval = 10;  
            tClose.Tick += new EventHandler(tClose_Tick);  
            tClose.Start();  
        }  
 
        void tClose_Tick(object sender, EventArgs e)  
        {  
            this.Opacity -= 0.01;  
            if (this.Opacity <= 0)  
            {  
                ((Timer)sender).Stop();  
                this.Close();  
            }  
        }  
 
        private Point mouse_offset;  
        private void Common_MouseUp(object sender, MouseEventArgs e)  
        {  
            //if (e.Button == MouseButtons.Left)  
            //{  
            //    Point mousePos = Control.MousePosition;  
            //    mousePos.Offset(mouse_offset.X, mouse_offset.Y);  
            //    ((Control)sender).Location = ((Control)sender).Parent.PointToClient(mousePos);  
 
            //}  
        }  
        private void Common_MouseDown(object sender, MouseEventArgs e)  
        {  
            mouse_offset = new Point(-e.X, -e.Y);  
        }  
        private void Common_MouseMove(object sender, MouseEventArgs e)  
        {  
            ((Control)sender).Cursor = Cursors.Arrow;  
            if (e.Button == MouseButtons.Left)  
            {  
                Point mousePos = Control.MousePosition;  
                mousePos.Offset(mouse_offset.X, mouse_offset.Y);  
                ((Control)sender).Location = ((Control)sender).Parent.PointToClient(mousePos);  
 
                mousepostion.Text = mousePos.ToString();  
            }  
 
            controlpostion.Text = Control.MousePosition.ToString();  
            mouseoffset.Text = mouse_offset.ToString();  
 
        }  
 
        private void button1_Click(object sender, EventArgs e)  
        {  
            MessageBox.Show("Click!!");  
        }  
 
    }  
}
本文来自: Csharp学习交流论坛 详细出处参考：http://csharp.5d6d.com/thread-155-1-1.html