本篇文章给大家分享的是有关C#中怎么利用异步实现一个进度条效果，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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C#进度条实现之异步实例进度条页面:
//==================================== // Microsoft patterns & practices // CompositeUI Application Block //==================================== // Copyright ?Microsoft Corporation. //All rights reserved. // THIS CODE AND INFORMATION IS //PROVIDED "AS IS" WITHOUT WARRANTY // OF ANY KIND, EITHER EXPRESSED OR //IMPLIED, INCLUDING BUT NOT // LIMITED TO THE IMPLIED WARRANTIES // OF MERCHANTABILITY AND // FITNESS FOR A PARTICULAR PURPOSE. //===================================== using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace BackgroudWokerUI { public partial class ProgressForm : Form { public ProgressForm() { InitializeComponent(); } //工作完成后执行的事件 public void OnProcessCompleted(object sender, EventArgs e) { this.Close(); } //工作中执行进度更新 ，C#进度条实现之异步实例public void OnProgressChanged(object sender, ProgressChangedEventArgs e) { progressWork.Value = e.ProgressPercentage; } private void btnClose_Click(object sender, EventArgs e) { Close(); } } }C#进度条实现之异步实例主页面:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Threading; //Note You must be careful not to manipulate any user-interface objects //in your System.ComponentModel.BackgroundWorker.DoWork event handler. //Instead, communicate to the user interface through the //System.ComponentModel.BackgroundWorker.ProgressChanged and //System.ComponentModel.BackgroundWorker.RunWorkerCompleted events. namespace BackgroudWokerUI { public partial class MainForm : Form { //BindingList is useful list for UI private IList leftList = new BindingList(); private IList rightList = new BindingList(); private BackgroundWorker worker = null; public MainForm() { InitializeComponent(); //Databinding here listBox1.DataSource = leftList; listBox2.DataSource = rightList; } private void addButton_Click(object sender, EventArgs e) { if (textBox.Text.Length != 0) { leftList.Add(textBox.Text); textBox.Text = ""; textBox.Focus(); } } private void moveButton_Click(object sender, EventArgs e) { //显示进度条 ，C#进度条实现之异步实例ProgressForm progressForm = new ProgressForm(); progressForm.Show(); // Prepare the background worker //for asynchronous prime number calculation //准备进度条的记数 worker= new BackgroundWorker(); // Specify that the background //worker provides progress notifications //指定提供进度通知 worker.WorkerReportsProgress = true; // Specify that the background worker supports cancellation //提供中断功能 worker.WorkerSupportsCancellation = true; // The DoWork event handler is the main //work function of the background thread //线程的主要功能是处理事件 //开启线程执行工作 ，C#进度条实现之异步实例worker.DoWork += new DoWorkEventHandler(worker_DoWork); // Specify the function to use to handle progress //指定使用的功能来处理进度 worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged); worker.ProgressChanged += new ProgressChangedEventHandler(progressForm.OnProgressChanged); // Specify the function to run when the //background worker finishes // There are three conditions possible //that should be handled in this function: // 1. The work completed successfully // 2. The work aborted with errors // 3. The user cancelled the process //进度条结束完成工作 //1.工作完成 //2.工作错误异常 //3.取消工作 worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler( worker_RunWorkerCompleted); worker.RunWorkerCompleted+= new RunWorkerCompletedEventHandler( progressForm.OnProcessCompleted); //If your background operation requires a parameter, //call System.ComponentModel.BackgroundWorker.RunWorkerAsync //with your parameter. Inside //the System.ComponentModel.BackgroundWorker.DoWork //event handler, you can extract the parameter from the //System.ComponentModel.DoWorkEventArgs.Argument property. //如果进度条需要参数 //调用System.ComponentModel.BackgroundWorker.RunWorkerAsync //传入你的参数至System.ComponentModel.BackgroundWorker.DoWork //提取参数 //System.ComponentModel.DoWorkEventArgs.Argument worker.RunWorkerAsync(leftList); } //单线程执行工作 private void worker_DoWork(object sender, DoWorkEventArgs e) { MoveList((BackgroundWorker)sender,e); } //进行转移工作 private void MoveList(BackgroundWorker worker,DoWorkEventArgs e) { IList list = e.Argument as IList; for (int i = 0; i < list.Count; i++) { // Check for cancellation //检查取消 if (worker.CancellationPending) { e.Cancel = true; break; } else { // This will be handled in the correct thread thanks to the // internals of BackgroundWroker and AsyncOperation worker.ReportProgress((i + 1) * (100 / list.Count), list[i]); // Simulate some time consuming proccess. //线程休眠 Thread.Sleep(500); } } } //添加数据至右边listBox private void worker_ProgressChanged( object sender, ProgressChangedEventArgs e) { //Add string to the right listBox rightList.Add(e.UserState as string); } //C#进度条实现之异步实例//工作完成状态 private void worker_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e) { if (e.Cancelled) { label.Text = "Cancelled!取消"; } else if (e.Error != null) { label.Text = "Error!异常"; } else { label.Text = "Success!完成"; leftList.Clear(); } } //取消中 private void cancelButton_Click( object sender, EventArgs e) { if (worker.IsBusy) { label.Text = "Cancelling..."; //挂起进程 worker.CancelAsync(); } } //返回操作 private void moveBackButton_Click( object sender, EventArgs e) { foreach (string str in rightList) { leftList.Add(str); } rightList.Clear(); } } } 以上就是C#中怎么利用异步实现一个进度条效果，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
