我也在做这个，我们可以讨论一下吧！
我的qq：149724938

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsApplication1
{
public class Form2 : System.Windows.Forms.Form
{
private System.Windows.Forms.Timer timer1;
private System.ComponentModel.IContainer components;

private int Seed  = 3;
const int OUTSIDE = 9; // 3 pixels
const int WHOLE   = 90; // whole height
private int STAY  = 1;
private System.Windows.Forms.Timer timer2;  


public Form2()
{
InitializeComponent();
}

protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.timer1 = new System.Windows.Forms.Timer(this.components);
this.timer2 = new System.Windows.Forms.Timer(this.components);
// 
// timer1
// 
this.timer1.Interval = 1;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
// 
// timer2
// 
this.timer2.Interval = 500;
this.timer2.Tick += new System.EventHandler(this.timer2_Tick);
// 
// Form2
// 
this.AutoScaleBaseSize = new System.Drawing.Size(5, 15);
this.BackColor = System.Drawing.Color.Brown;
this.ClientSize = new System.Drawing.Size(560, 10);
this.ControlBox = false;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "Form2";
this.TopMost = true;
this.Load += new System.EventHandler(this.Form2_Load);
this.MouseEnter += new System.EventHandler(this.Form2_MouseEnter);
this.MouseLeave += new System.EventHandler(this.Form2_MouseLeave);

}
#endregion

private void Form2_Load(object sender, System.EventArgs e)
{
this.Top = 0;
this.Left = 0;
this.Width = Screen.PrimaryScreen.WorkingArea.Width;
this.Height = OUTSIDE;
}

private void timer1_Tick(object sender, System.EventArgs e)
{
if(this.Height >= WHOLE && Seed > 0)
{
this.timer1.Enabled = false;
}

if(this.Height <= OUTSIDE && Seed < 0)
{
this.timer1.Enabled = false;
this.timer2.Enabled = false;
}

this.Height += Seed;
}

private void timer2_Tick(object sender, System.EventArgs e)
{
STAY ++;
if(this.STAY == 2)
{
timer1.Enabled = true;
STAY = 0;
}
}

private void Form2_MouseEnter(object sender, System.EventArgs e)
{
if(this.Height == WHOLE)
return;

Seed = 3;
timer1.Enabled = true;
}

private void Form2_MouseLeave(object sender, System.EventArgs e)
{
if(this.Height == OUTSIDE)
return;

Seed = -3;
timer2.Enabled = true;
}
}
}

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