c# WPF图像加载像进度条

本文关键字：加载 WPF 图像 | 更新日期: 2023-09-27 18:14:33

我有一个进度条和一个图像。当进度条值为50时，图像加载50%。我试图添加图像作为进度条前景，但它有绿色阴影。所以丑。

我该怎么做?

c# WPF图像加载像进度条

要运行这个示例，您需要一个可以从http://res.freestockphotos.biz/pictures/16/16242-illustration-of-a-green-snake-pv.png获得的蛇图像。我已经直接使用了这个url，但是你应该先下载图片然后再使用它。

    你需要一个ProgressBar控件模板，因为你也想显示百分比状态。

代码可以这样使用:

<Window x:Class="WpfControlTemplates._32794074.Win32794074"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Win32794074" Height="600" Width="1000">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="397*"/>
            <RowDefinition Height="173*"/>
        </Grid.RowDefinitions>
        <ProgressBar x:Name="PBarCustom" Width="958" Height="200"  Maximum="958"  Value="958" Foreground="#FFE6E61F" Margin="17,185,17,11.932" ValueChanged="PBarCustom_ValueChanged">
            <ProgressBar.Background>
                <ImageBrush ImageSource="http://res.freestockphotos.biz/pictures/16/16242-illustration-of-a-green-snake-pv.png"/>
            </ProgressBar.Background>
            <ProgressBar.Template>
                <ControlTemplate>
                    <Grid Background="{TemplateBinding Background}">
                        <Rectangle x:Name="Thumb" HorizontalAlignment="Left" Fill="#FFC5EA1F" Stroke="#FF0DB442" Width="{TemplateBinding Width}" />
                        <Ellipse Fill="#FF7DEEDE" Height="124"  Stroke="#FF0DB442" Width="150" VerticalAlignment="Center" HorizontalAlignment="Center" Opacity="0.3"/>
                        <Label x:Name="tbStatus" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" FontWeight="Bold" FontSize="75" Foreground="#FF21BD76" Content="0"  />
                    </Grid>
                </ControlTemplate>
            </ProgressBar.Template>
        </ProgressBar>
        <Button x:Name="BtnLoadSnake" Content="Load Snake" HorizontalAlignment="Left" Margin="462,14.068,0,0" VerticalAlignment="Top" Width="75" Click="BtnLoadSnake_Click" Grid.Row="1"/>
    </Grid>
</Window>
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.Shapes;
using System.Windows.Threading;
namespace WpfControlTemplates._32794074
{
    /// <summary>
    /// Interaction logic for Win32794074.xaml
    /// </summary>
    public partial class Win32794074 : Window
    {
        public Win32794074()
        {
            InitializeComponent();
        }
        DispatcherTimer timer;
        private void BtnLoadSnake_Click(object sender, RoutedEventArgs e)
        {
            BtnLoadSnake.IsEnabled = false;
            PBarCustom.Value = PBarCustom.Maximum;
            Rectangle thumb = (Rectangle)PBarCustom.Template.FindName("Thumb", PBarCustom);
            thumb.Width = PBarCustom.Value;
            Label status = (Label)PBarCustom.Template.FindName("tbStatus", PBarCustom);
            status.Content = ((int)(100 - ((100 * PBarCustom.Value) / PBarCustom.Maximum))).ToString();
            Dispatcher disp = PBarCustom.Dispatcher;
            EventHandler pBarCallbackHandler = new EventHandler(pBarCallback);
            timer = new DispatcherTimer(TimeSpan.FromSeconds(0.5), DispatcherPriority.Normal, pBarCallback, disp);            
        }
        private void pBarCallback(object sender, EventArgs e)
        {
            PBarCustom.Value -= 13;
            Rectangle thumb = (Rectangle)PBarCustom.Template.FindName("Thumb", PBarCustom);
            thumb.Width = PBarCustom.Value;
            Label status = (Label)PBarCustom.Template.FindName("tbStatus", PBarCustom);
            status.Content = ((int)(100 - ((100 * PBarCustom.Value) / PBarCustom.Maximum))).ToString();
            if (PBarCustom.Value == 0)
                timer.Stop();
        }
        private void PBarCustom_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {            
            if(e.NewValue == 0)
                BtnLoadSnake.IsEnabled = true;
        }
    }
}

我也有类似的情况。如果你希望滚动条只是一个矩形，最简单的方法:

1-添加一个图像到你的窗口。

2-在上面放一个网格，这样网格会隐藏图像。

3-以编程方式改变网格的宽度或高度。

告诉我如果你需要一个示例代码。

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