C# 进度条窗口有取消按按钮

最新推荐文章于 2023-03-30 14:02:13 发布

原创最新推荐文章于 2023-03-30 14:02:13 发布 · 1.6k 阅读

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CC 4.0 BY-SA版权

文章标签：

#c# #object #button #null #application #system

本文介绍了一种在Windows Forms应用程序中实现进度条的方法，并通过两种方式展示了如何更新进度：一种是使用传统方法手动更新进度条；另一种是利用BackgroundWorker组件进行异步处理，提高用户体验。

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace Test

{

public class MyProgress

{

//by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.30

private int MaxNum;

Form progressForm= null ;

ProgressBar progressBar1= null ;

bool Stop= false ;

Label label1;

public bool ProgressStep( int step)

{

if (Stop)

{

this .Dispose();

return true ;

}

if (progressBar1.Value > progressBar1.Maximum)

{

this .Dispose();

return true ;

}

progressBar1.Value+= step;

label1.Text = " 目前完成 :" + (progressBar1.Value * 100 / progressBar1.Maximum) + "%" ;

Application .DoEvents();

return false ;

}

private void btn_Click( object sender, EventArgs e)

{

if (MessageBox.Show( " 你确定终止吗 " , " 终止 " , MessageBoxButtons.YesNo, MessageBoxIcon.Warning) != DialogResult.Yes)

Stop = false ;

else

Stop = true ;

}

public MyProgress( int Max, String Caption, bool IsCancel) // 最大值和标题

{

progressForm = new Form ();

progressForm.MinimizeBox = false ;

progressForm.MaximizeBox = false ;

progressForm.StartPosition = FormStartPosition.CenterScreen;

progressForm.Width = 326+19;

progressForm.Height = 96+19+20;

progressForm.Text= Caption;

progressForm.TopMost = true ; // 设置窗口在上边

label1 = new Label();

label1.Left = 9;

label1.Top = 15;

label1.Parent = progressForm;

progressBar1 = new ProgressBar();

progressBar1.Maximum = Max;

MaxNum = Max;

progressBar1.Left = 9;

progressBar1.Top = 25+15;

progressBar1.Width = 310;

progressBar1.Parent = progressForm;

progressBar1.Value = 0;

if (IsCancel)

{

Button btnCancel = new Button();

btnCancel.Text = " 取消 " ;

btnCancel.Left = 240;

btnCancel.Top = 54+20;

btnCancel.Parent = progressForm;

btnCancel.Click += new System.EventHandler( this .btn_Click);

}

progressForm.Show();

}

public void Dispose()

{

if (progressForm != null )

{

progressBar1.Dispose();

progressForm.Dispose();

}

----------------------------------

//调用测试进度条窗口

private void button2_Click( object sender, EventArgs e)

{

MyProgress myProgress = new MyProgress(100, " 进度条 " , true );

try

{

for ( int i = 0; i < 100; i++)

{

if (myProgress.ProgressStep(1)) return ;

Application .DoEvents(); // 让系统在百忙中抽空刷新

Thread.Sleep(100);

}

finally

{

myProgress.Dispose();

}

//-------------------------------- 按高手的意思修改 BackgroundWorker ，如下

//使用BackgroundWorker异步进度条

using System;

using System.Collections.Generic;

using System.Text;

using System.ComponentModel; //BackgroundWorker所在的

using System.Windows.Forms;

namespace Test

{

class MyNewProgress

{

private BackgroundWorker backgroundWorker = null ;

//by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.31

private int MaxNum;

Form progressForm = null ;

ProgressBar progressBar1 = null ;

Label label1;

private void btn_Click( object sender, EventArgs e)

{

if (backgroundWorker.IsBusy)

{

if (MessageBox.Show( " 你确定终止吗 " , " 终止 " , MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)

backgroundWorker.CancelAsync();

}

public void OnProcessCompleted( object sender, EventArgs e)

{

Dispose();

}

public void OnProgressChanged( object sender, ProgressChangedEventArgs e)

{

progressBar1.Value = e.ProgressPercentage;

label1.Text = " 目前完成 :" + (progressBar1.Value * 100 / progressBar1.Maximum) + "%" ;

}

private void worker_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e)

{

//return;

/*if (e.Cancelled)

{

MessageBox.Show(" 取消 ");

}

else if (e.Error != null)

{

MessageBox.Show(" 错误 ");

}

else

{

MessageBox.Show(" 完成 ");

}

* /

}

private void Form _FormClosing( object sender, FormClosingEventArgs e) // 处理窗口直接关闭事件

{

if (backgroundWorker.IsBusy)

{

if (MessageBox.Show( " 你确定终止吗 " , " 终止 " , MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)

backgroundWorker.CancelAsync();

else

e.Cancel = true ;

}

// 把事件传进入

private void SetbackgroundWorker(DoWorkEventHandler DoWork, ProgressChangedEventHandler worker_ProgressChanged)

{

backgroundWorker = new BackgroundWorker();

backgroundWorker.WorkerReportsProgress = true ; // 有进度条

backgroundWorker.WorkerSupportsCancellation = true ; // 是否支持异步取消

backgroundWorker.DoWork += new DoWorkEventHandler(DoWork);

backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged); // 做的事情

backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(OnProgressChanged); // 更新进度条

backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted); // 完成事件

backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(OnProcessCompleted);

backgroundWorker.RunWorkerAsync();

}

public MyNewProgress( int Max, String Caption, bool IsCancel, DoWorkEventHandler DoWork, ProgressChangedEventHandler worker_ProgressChanged) // 最大值和标题

{

progressForm = new Form ();

progressForm.MinimizeBox = false ;

progressForm.MaximizeBox = false ;

progressForm.StartPosition = FormStartPosition.CenterScreen;

progressForm.Width = 326 + 19;

progressForm.Height = 96 + 19 + 20;

progressForm.Text = Caption;

progressForm.TopMost = true ; //设置窗口在上边

label1 = new Label();

label1.Left = 9;

label1.Top = 15;

label1.Parent = progressForm;

progressBar1 = new ProgressBar();

progressBar1.Maximum = Max;

MaxNum = Max;

progressBar1.Left = 9;

progressBar1.Top = 25 + 15;

progressBar1.Width = 310;

progressBar1.Parent = progressForm;

progressBar1.Value = 0;

if (IsCancel)

{

Button btnCancel = new Button();

btnCancel.Text = " 取消 " ;

btnCancel.Left = 240;

btnCancel.Top = 54 + 20;

btnCancel.Parent = progressForm;

btnCancel.Click += new System.EventHandler( this .btn_Click);

}

progressForm.FormClosing += new System.Windows.Forms.FormClosingEventHandler( this . Form _FormClosing);

progressForm.Show();

SetbackgroundWorker(DoWork, worker_ProgressChanged);

}

public void Dispose()

{

if (progressForm != null )

{

progressBar1.Dispose();

progressForm.Dispose();

}

//测试方法，放一个按钮button和标签label1

private void worker_DoWork( object sender, DoWorkEventArgs e)

{

DoNothing((BackgroundWorker)sender, e);

}

private void DoNothing(BackgroundWorker worker, DoWorkEventArgs e)

{

//要做的事情，写在这里

int num = 100;

for ( int i = 0; i <num; i++)

{

// Check for cancellation

if (worker.CancellationPending)

{

e.Cancel = true ;

break ;

}

else

{

worker.ReportProgress((i + 1) * (100 / num));

Thread.Sleep(100);

}

private void worker_ProgressChanged( object sender, ProgressChangedEventArgs e)

{

label1.Text = e.ProgressPercentage.ToString();

}

private void button1_Click( object sender, EventArgs e)

{

MyNewProgress myProgress = new MyNewProgress(100, "进度条" , true , worker_DoWork, worker_ProgressChanged);

}

C# 进度条窗口 有取消按按钮

C# 进度条窗口有取消按按钮