WPF好看的進度條實現淺談（效果有點類似VS2012安裝界面）

　　為了界面友好，一般的操作時間較長時，都需要增加進度條提示。由於WPF自帶的進度條其實不怎么好看，而且沒啥視覺效果。后來，裝VS2012時，發現安裝過程中進度條效果不錯，於是上網查了資料。學習了ModernUI（開源的），地址：https://github.com/firstfloorsoftware/mui。

　　后來，做了嘗試寫了個Demo，效果不錯。另外，專門錄制了tif文件，方便大家看到效果。廢話不多說，先展示效果：

一、效果展示

　　A、VS2012安裝界面圖；

         

　　B、個人嘗試Demo效果圖：　

    　  

二、實現說明

　　1、下載MUI相關代碼或者dll文件；

　　2、工程中引入該dll，並引入其資源文件；

<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、在需要顯示進度條的頁面，加入控件（其實還是WPF控件，只是MUI擴展了其樣式而已）；

<Label Margin="280,169,0,0" Style="{StaticResource BackGroundContentText}" x:Name="lblMainState" HorizontalAlignment="Left" VerticalAlignment="Top">正在啟動:</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">正在加載地圖數據...</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、后台實現，由於要根據情況更新進度文字及進度條的值。所以，這里用到了異步BackgroundWorker（具體可以網上查查相關資料）；

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

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

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

        /// <summary>
        /// 后台任務執行完畢后事件
        /// </summary>
        public event EventHandler<BackgroundWorkerEventArgs> BackgroundWorkerCompleted;

        private BackgroundWorkerEventArgs _eventArgs;//異常參數

        /// <summary>
        /// 構造
        /// </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>
        /// 開始工作
        /// </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>
        /// 后台程序運行時拋出的異常
        /// </summary>
        public Exception BackGroundException { get; set; }
    }
}

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

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

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

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

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

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

        /// <summary>
        /// 賦值
        /// </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;
        }
    }
}