Question

C#多线程之如何弹出一个模式窗口来显示进度条

Answer 1

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; namespace Demo0004 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } //线程开始的时候调用的委托 private delegate void maxValueDelegate(int maxValue); //线程执行中调用的委托 private delegate void nowValueDelegate(int nowValue); private void button1_Click(object sender, EventArgs e) { ThreadMethod method = new ThreadMethod(); //先订阅一下事件 method.threadStartEvent += new EventHandler(method_threadStartEvent); method.threadEvent += new EventHandler(method_threadEvent); method.threadEndEvent += new EventHandler(method_threadEndEvent); Thread thread = new Thread(new ThreadStart(method.runMethod)); thread.Start(); } /// <summary> /// 线程开始事件,设置进度条最大值 /// 但是我不能直接操作进度条,需要一个委托来替我完成 /// </summary> /// <param name="sender">ThreadMethod函数中传过来的最大值</param> /// <param name="e"></param> void method_threadStartEvent(object sender, EventArgs e) { int maxValue = Convert.ToInt32(sender); maxValueDelegate max = new maxValueDelegate(setMax); this.Invoke(max, maxValue); } /// <summary> /// 线程执行中的事件,设置进度条当前进度 /// 但是我不能直接操作进度条,需要一个委托来替我完成 /// </summary> /// <param name="sender">ThreadMethod函数中传过来的当前值</param> /// <param name="e"></param> void method_threadEvent(object sender, EventArgs e) { int nowValue = Convert.ToInt32(sender); nowValueDelegate now = new nowValueDelegate(setNow); this.Invoke(now, nowValue); } /// <summary> /// 线程完成事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> void method_threadEndEvent(object sender, EventArgs e) { MessageBox.Show("执行已经完成!"); } /// <summary> /// 我被委托调用,专门设置进度条最大值的 /// </summary> /// <param name="maxValue"></param> private void setMax(int maxValue) { this.progressBar1.Maximum = maxValue; } /// <summary> /// 我被委托调用,专门设置进度条当前值的 /// </summary> /// <param name="nowValue"></param> private void setNow(int nowValue) { this.progressBar1.Value = nowValue; } } public class ThreadMethod { /// <summary> /// 线程开始事件 /// </summary> public event EventHandler threadStartEvent; /// <summary> /// 线程执行时事件 /// </summary> public event EventHandler threadEvent; /// <summary> /// 线程结束事件 /// </summary> public event EventHandler threadEndEvent; public void runMethod() { int count = 100; //执行多少次 threadStartEvent.Invoke(count, new EventArgs());//通知主界面,我开始了,count用来设置进度条的最大值 for (int i = 0; i < count; i++) { Thread.Sleep(100);//休息100毫秒,模拟执行大数据量操作 threadEvent.Invoke(i, new EventArgs());//通知主界面我正在执行,i表示进度条当前进度 } threadEndEvent.Invoke(new object(), new EventArgs());//通知主界面我已经完成了 } }