WPF好看的进度条实现浅谈（效果有点类似VS2012安装界面）

　　为了界面友好，一般的操作时间较长时，都需要增加进度条提示。由于WPF自带的进度条其实不怎么好看，而且没啥视觉效果。后来，装VS2012时，发现安装过程中进度条效果不错，于是上网查了资料。学习了ModernUI（开源的），地址：https://github.com/firstfloorsoftware/mui。

　　后来，做了尝试写了个Demo，效果不错。另外，专门录制了tif文件，方便大家看到效果。废话不多说，先展示效果：

一、效果展示

　　A、VS2012安装界面图；

　　B、个人尝试Demo效果图：　

二、实现说明

　　1、下载MUI相关代码或者dll文件；

　　2、工程中引入该dll，并引入其资源文件；

<Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/ModernUI.xaml" />
                <ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/ModernUI.Light.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>

　　3、在需要显示进度条的页面，加入控件（其实还是WPF控件，只是MUI扩展了其样式而已）；

<Label Margin="280,169,0,0" Style="{StaticResource BackGroundContentText}" x:Name="lblMainState" HorizontalAlignment="Left" VerticalAlignment="Top">正在启动:</Label>
        <ProgressBar Margin="280,200,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="500" Minimum="0" x:Name="ProgressControlRealValue" Maximum="1"  Value="0.1" Height="16" IsIndeterminate="False"/>
        <Label Margin="280,212,0,0" Style="{StaticResource BackGroundContentText}" x:Name="lblProcess" HorizontalAlignment="Left" VerticalAlignment="Top">正在加载地图数据...</Label>
        <ProgressBar Margin="280,250,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"  Minimum="0" x:Name="ProgressControl"  Width="500" Maximum="2" Height="16" IsIndeterminate="True" />

　　4、后台实现，由于要根据情况更新进度文字及进度条的值。所以，这里用到了异步BackgroundWorker（具体可以网上查查相关资料）；

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace Monitor.Class
{
    /// <summary>
    /// 异步操作
    /// </summary>
    public class CWorker
    {
        /// <summary>
        /// 对象
        /// </summary>
        private BackgroundWorker backgroundWorker;

        /// <summary>
        /// 后台执行的操作
        /// </summary>
        public Action BackgroundWork { get; set; }

        /// <summary>
        /// 后台任务执行完毕后事件
        /// </summary>
        public event EventHandler<BackgroundWorkerEventArgs> BackgroundWorkerCompleted;

        private BackgroundWorkerEventArgs _eventArgs;//异常参数

        /// <summary>
        /// 构造
        /// </summary>
        public CWorker()
        {
            _eventArgs = new BackgroundWorkerEventArgs();
            backgroundWorker = new BackgroundWorker();
            backgroundWorker.WorkerReportsProgress = true;
            backgroundWorker.WorkerSupportsCancellation = true;
            backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
            backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
        }

        /// <summary>
        /// 开始工作
        /// </summary>
        public void BegionWork()
        {
            if (backgroundWorker.IsBusy)
                return;
            backgroundWorker.RunWorkerAsync();
        }

        /// <summary>
        /// 工作
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            if (BackgroundWork != null)
            {
                try
                {
                    BackgroundWork();
                }
                catch (Exception ex)
                {
                    _eventArgs.BackGroundException = ex;
                }
            }
        }

        /// <summary>
        /// 完成
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (this.BackgroundWorkerCompleted != null)
            {
                this.BackgroundWorkerCompleted(null, _eventArgs);
            }
        }
    }

    /// <summary>
    /// 事件
    /// </summary>
    public class BackgroundWorkerEventArgs : EventArgs
    {
        /// <summary>
        /// 后台程序运行时抛出的异常
        /// </summary>
        public Exception BackGroundException { get; set; }
    }
}

namespace Monitor
{
    /// <summary>
    /// Splash.xaml 的交互逻辑
    /// </summary>
    public partial class Splash : Window
    {
        MainWindow m_MainWindow = null;//主窗口
        CWorker m_Work = null;//任务

        public Splash()
        {
            InitializeComponent();
            m_MainWindow = new MainWindow();//创建主窗口对象
            m_Work = new CWorker();
            m_Work.BackgroundWork = this.ProcessDo;
            m_Work.BackgroundWorkerCompleted += new EventHandler<BackgroundWorkerEventArgs>(m_Work_BackgroundWorkerCompleted);
        }

        /// <summary>
        /// 进度提示
        /// </summary>
        public void ProcessDo()
        {
            m_MainWindow.InitData(this);
        }

        /// <summary>
        /// 移动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            this.DragMove();
        }

        /// <summary>
        /// 窗口加载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            m_Work.BegionWork();
        }

        /// <summary>
        /// 执行完成
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void m_Work_BackgroundWorkerCompleted(object sender, BackgroundWorkerEventArgs e)
        {
            m_MainWindow.Show();
            this.Close();
        }

        /// <summary>
        /// 赋值
        /// </summary>
        /// <param name="text"></param>
        private delegate void SetProcessLabelDelegate(string text, double processValue);
        public void SetProcessValue(string text, double processValue)
        {
            if (!Dispatcher.CheckAccess())
            {
                Dispatcher.Invoke(DispatcherPriority.Send, new SetProcessLabelDelegate(SetProcessValue), text, processValue);
                return;
            }
            this.lblProcess.Content = text;
            this.ProgressControlRealValue.Value = processValue;
        }
    }
}