C# 进度条窗口 有取消按按钮

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:[email protected],[email protected] 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:[email protected],[email protected] 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);

    

}