[讨论]怎样改成一个自动的进展条？ - C# 论坛

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[讨论]怎样改成一个自动的进展条？

下面是一个进展条的代码：
public void UpdatePercentText()
{
int nPercent,nRange;
nRange=progressBar1.Maximum-progressBar1.Minimum;
nPercent=100*progressBar1.Value / nRange;
label1.Text=String.Concat(nPercent.ToString(),"%" );
}
private void Form1_Load(object sender, System.EventArgs e)
{
progressBar1.Maximum=100;
progressBar1.Minimum=0;
progressBar1.Value=0;
progressBar1.Step=1;
UpdatePercentText();
}

private void button1_Click(object sender, System.EventArgs e)
{

int nStep=-progressBar1.Step;
progressBar1.Increment(nStep);
UpdatePercentText();
}

private void button2_Click(object sender, System.EventArgs e)
{
progressBar1.PerformStep();
UpdatePercentText();
}
这是一个手动的，点击进展一个步长，我现在想让它能自动进展的，并进展到100%时弹出下载完毕对话框，这样能实现吗？又在那里怎样改呢？？请各位高手多多指点！

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

namespace progBarApp
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Timers.Timer timer1;
private System.Windows.Forms.ProgressBar progressBar1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
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.timer1 = new System.Timers.Timer();
this.progressBar1 = new System.Windows.Forms.ProgressBar();
((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit();
this.SuspendLayout();
//
// timer1
//
this.timer1.Enabled = true;
this.timer1.Interval = 1000;
this.timer1.SynchronizingObject = this;
this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
//
// progressBar1
//
this.progressBar1.Location = new System.Drawing.Point(40, 88);
this.progressBar1.Maximum = 200;
this.progressBar1.Name = "progressBar1";
this.progressBar1.Size = new System.Drawing.Size(200, 20);
this.progressBar1.Step = 20;
this.progressBar1.TabIndex = 1;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(280, 189);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.progressBar1});
this.Name = "Form1";
this.Text = "使用进度条";
((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit();
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (progressBar1.Value >= 200 )
{
progressBar1.Value = 0;
return;
}
progressBar1.Value += 20;
}
}
}