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 Property

        public 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));

        #endregion

        private 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 MyRegion
        public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion

        private 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：