WPF 进度条(ProgressBar)示例一

本文讲述：WPF 进度条(ProgressBar)简单的样式修改和使用。

进度显示界面：使用UserControl把ProgressBar和进度值以及要显示的内容全部组装在UserControl界面中，方便其他界面直接进行使用。

<UserControl x:Class="DefProcessBarDemo.DefProcessBar"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:DefProcessBarDemo"mc:Ignorable="d"x:Name="MyWatingViewControl"><UserControl.Background><VisualBrush><VisualBrush.Visual><Border x:Name="ControlBackground"Background="Black"Opacity="0.45" /></VisualBrush.Visual></VisualBrush></UserControl.Background><Viewbox x:Name="myViewBox"Stretch="UniformToFill"StretchDirection="DownOnly"UseLayoutRounding="True"><Grid Margin="0 0 0 0"HorizontalAlignment="Center"VerticalAlignment="Center"MouseDown="Image_MouseDown"><Border CornerRadius="5"SnapsToDevicePixels="True"><Border.Effect><DropShadowEffect Color="#000000"BlurRadius="10"ShadowDepth="3"Opacity="0.35"Direction="270" /></Border.Effect><Border Background="#4a4a4a"CornerRadius="5"Margin="5"BorderBrush="#9196a0"BorderThickness="1"SnapsToDevicePixels="True"><Grid Width="500"Height="150"><Grid.RowDefinitions><RowDefinition Height="auto" /><RowDefinition Height="35" /><RowDefinition Height="*" /><RowDefinition Height="30" /></Grid.RowDefinitions><Image Name="CloseIco"Width="25"Height="25"Margin="0,0,0,0"MouseDown="Image_MouseDown"HorizontalAlignment="Right"VerticalAlignment="Top" /><StackPanel Grid.Row="1"Orientation="Horizontal"HorizontalAlignment="Center"><TextBlock Text="{Binding Message,ElementName=MyWatingViewControl}"FontSize="18"Foreground="Yellow"TextWrapping="WrapWithOverflow"TextTrimming="CharacterEllipsis"MaxWidth="450"VerticalAlignment="Bottom" /><TextBlock Text="("FontSize="18"Foreground="Yellow"VerticalAlignment="Bottom" /><TextBlock Text="{Binding ElementName=progressBar, Path=Value, StringFormat={}{0:0}%}"FontSize="18"Foreground="Yellow"FontFamily="楷体"VerticalAlignment="Bottom" /><TextBlock Text=")"FontSize="18"Foreground="Yellow"VerticalAlignment="Bottom" /></StackPanel><Grid  Grid.Row="2"HorizontalAlignment="Center"VerticalAlignment="Top"Margin="0 10"><ProgressBar x:Name="progressBar"Maximum="100"Height="25"Width="420"Foreground="Green"Background="LightGray"HorizontalContentAlignment="Center"VerticalContentAlignment="Center"Value="{Binding ProcessBarValue,ElementName=MyWatingViewControl}" /></Grid></Grid></Border></Border></Grid></Viewbox>
</UserControl>

进度显示界面：UserControl 后台逻辑实现，主要定义了进度值、显示的文本、以及UserControl的大小。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;namespace DefProcessBarDemo
{/// <summary>/// DefProcessBar.xaml 的交互逻辑/// </summary>public partial class DefProcessBar : UserControl{public DefProcessBar(){InitializeComponent();this.Loaded += WaitingView_Loaded;}void WaitingView_Loaded(object sender, RoutedEventArgs e){if (this.Parent != null){var root = (FrameworkElement)this.Parent;if (root != null){this.Width = root.ActualWidth;this.Height = root.ActualHeight;ControlBackground.Width = root.ActualWidth;ControlBackground.Height = root.ActualHeight;}}}#region Propertypublic string Message{get { return (string)GetValue(MessageProperty); }set { SetValue(MessageProperty, value); }}public static readonly DependencyProperty MessageProperty = DependencyProperty.Register("Message", typeof(string), typeof(DefProcessBar),new PropertyMetadata(""));public double ProcessBarValue{get { return (double)GetValue(ProcessBarValueProperty); }set { SetValue(ProcessBarValueProperty, value); }}public static readonly DependencyProperty ProcessBarValueProperty = DependencyProperty.Register("ProcessBarValue", typeof(double), typeof(DefProcessBar),new PropertyMetadata(0.0));#endregionprivate void Image_MouseDown(object sender, MouseButtonEventArgs e){this.Visibility = Visibility.Hidden;}}
}

在MainWindow界面中调用[进度显示界面]，示例如下：

<Window x:Class="DefProcessBarDemo.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:DefProcessBarDemo"mc:Ignorable="d" Title="DefProcessBar" Width="600" Height="500"WindowStartupLocation="CenterScreen" x:Name="mainwnd"xmlns:pdb="clr-namespace:DefProcessBarDemo" Background="Teal"><StackPanel><Button Height="30" Width="120" Margin="20" Content="点击" Click="Button_Click"/><pdb:DefProcessBar VerticalAlignment="Center"ProcessBarValue="{Binding ExportValue, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"Message="{Binding ExportMessage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />        </StackPanel>
</Window>

后台模拟进度变化，使用Task任务，更新进度值，代码示例如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;namespace DefProcessBarDemo
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window, System.ComponentModel.INotifyPropertyChanged{public MainWindow(){InitializeComponent();this.DataContext = this;}private string m_ExportMessage = "正在导出，请稍后....";/// <summary>/// /// <summary>public string ExportMessage{get { return m_ExportMessage; }set{m_ExportMessage = value;OnPropertyChanged("ExportMessage");}}private double m_ExportValue = 0.0;/// <summary>/// /// <summary>public double ExportValue{get { return m_ExportValue; }set{m_ExportValue = value;OnPropertyChanged("ExportValue");}}#region MyRegionpublic event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;protected void OnPropertyChanged(string propertyName){if (PropertyChanged != null){PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));}}#endregionprivate void Button_Click(object sender, RoutedEventArgs e){Task.Run(() =>{for(int i = 1; i < 101; i++){ExportValue++;System.Threading.Thread.Sleep(1000);if (ExportValue == 100)ExportMessage = "完成";}});string strRes = "";bool bRet = GetCmdResult("netsh wlan show profiles", out strRes);}}
}

运行时，点击【点击】按钮，即可看到进度持续不断地更新，界面如下图所示：