在 WPF 控件上显示“加载”指示器的最佳方法是什么答案

【问题标题】：What is the best way to display a 'loading' indicator on a WPF control在 WPF 控件上显示“加载”指示器的最佳方法是什么
【发布时间】：2010-09-10 18:51:20
【问题描述】：

在 UserControl.Load 期间在 C#.Net WPF 中 ->

在完成收集数据并呈现其内容之前，在 UserControl 上显示旋转圆圈/“正在加载”指示器的最佳方式是什么？

【问题讨论】：

标签： c# .net wpf user-controls

【解决方案1】：

我通常会创建这样的布局：

<Grid>
    <Grid x:Name="MainContent" IsEnabled="False">
    ...
    </Grid>

    <Grid x:Name="LoadingIndicatorPanel">
    ...
    </Grid>
</Grid>

然后我在工作线程上加载数据，完成后我更新“MainContent”网格下的 UI 并启用网格，然后将 LoadingIndicatorPanel 的可见性设置为 Collapsed。

我不确定这是您要问的还是您想知道如何在加载标签中显示动画。如果是您所追求的动画，请更新您的问题以更具体。

【讨论】：

【解决方案2】：

这是我最近为了创建加载动画而正在做的事情。此 xaml 将生成一个动画圈。

我最初的想法是创建一个装饰器并将这个动画用作它的内容，然后在装饰器层中显示加载动画并将下面的内容变灰。

还没有机会完成它，所以我想我会发布动画供您参考。

<Window 
    x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1"
    Height="300"
    Width="300"
    >
    <Window.Resources>
        <Color x:Key="FilledColor" A="255" B="155" R="155" G="155"/>
        <Color x:Key="UnfilledColor" A="0" B="155" R="155" G="155"/>

        <Storyboard x:Key="Animation0" FillBehavior="Stop" BeginTime="00:00:00.0" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_00" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation1" BeginTime="00:00:00.2" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_01" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation2" BeginTime="00:00:00.4" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_02" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation3" BeginTime="00:00:00.6" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_03" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation4" BeginTime="00:00:00.8" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_04" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation5" BeginTime="00:00:01.0" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_05" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation6" BeginTime="00:00:01.2" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_06" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

        <Storyboard x:Key="Animation7" BeginTime="00:00:01.4" RepeatBehavior="Forever">
            <ColorAnimationUsingKeyFrames Storyboard.TargetName="_07" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)">
                <SplineColorKeyFrame KeyTime="00:00:00.0" Value="{StaticResource FilledColor}"/>
                <SplineColorKeyFrame KeyTime="00:00:01.6" Value="{StaticResource UnfilledColor}"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>
    </Window.Resources>

    <Window.Triggers>
        <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <BeginStoryboard Storyboard="{StaticResource Animation0}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation1}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation2}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation3}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation4}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation5}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation6}"/>
            <BeginStoryboard Storyboard="{StaticResource Animation7}"/>
        </EventTrigger>
    </Window.Triggers>

    <Canvas>
        <Canvas Canvas.Left="21.75" Canvas.Top="14" Height="81.302" Width="80.197">
            <Canvas.Resources>
                <Style TargetType="Ellipse">
                    <Setter Property="Width" Value="15"/>
                    <Setter Property="Height" Value="15" />
                    <Setter Property="Fill" Value="#FFFFFFFF" />
                </Style>
            </Canvas.Resources>

            <Ellipse x:Name="_00" Canvas.Left="24.75" Canvas.Top="50"/>
            <Ellipse x:Name="_01" Canvas.Top="36" Canvas.Left="29.5"/>
            <Ellipse x:Name="_02" Canvas.Left="43.5" Canvas.Top="29.75"/>
            <Ellipse x:Name="_03" Canvas.Left="57.75" Canvas.Top="35.75"/>
            <Ellipse x:Name="_04" Canvas.Left="63.5" Canvas.Top="49.75" />
            <Ellipse x:Name="_05" Canvas.Left="57.75" Canvas.Top="63.5"/>
            <Ellipse x:Name="_06" Canvas.Left="43.75" Canvas.Top="68.75"/>
            <Ellipse x:Name="_07" Canvas.Top="63.25" Canvas.Left="30" />
            <Ellipse Stroke="{x:Null}" Width="39.5" Height="39.5" Canvas.Left="31.75" Canvas.Top="37" Fill="{x:Null}"/>
        </Canvas>
    </Canvas>
</Window>

【讨论】：

也许这是个愚蠢的问题，但既然可以使用极其相似的 Activity 控件，为什么还要编写自己的动画呢？
@Peter Wone：什么活动控制？ MSDN 对“活动”一词有大量点击，但快速浏览显示没有 WPF/SL 控件。
@mos：Activity 控件已重命名为 BusyIndicator，并且可以在 silverlight.codeplex.com/releases/view/43528 处与大量其他扩展控件一起使用
@Peter：这将适用于 Silverlight，但不适用于 WPF，这是原始问题的主题。据我所知，WPF 或工具包中仍然没有 BusyIndicator 或等效项。虽然我确信你可以很容易地移植 Silverlight 控件。

【解决方案3】：

我改进了 Ian Oakes 设计并构建了他的加载指示器的可扩展版本：

<UserControl x:Class="Mesap.Framework.UI.Controls.BusyIndicator"
             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" 
             mc:Ignorable="d" Name="Root" Foreground="#9b9b9b"
             d:DesignHeight="100" d:DesignWidth="100">
    <Grid>
        <Grid.Resources>
            <Storyboard x:Key="Animation0" FillBehavior="Stop" BeginTime="00:00:00.0" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E00" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation1" BeginTime="00:00:00.2" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E01" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation2" BeginTime="00:00:00.4" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E02" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation3" BeginTime="00:00:00.6" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E03" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation4" BeginTime="00:00:00.8" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E04" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation5" BeginTime="00:00:01.0" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E05" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation6" BeginTime="00:00:01.2" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E06" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Storyboard x:Key="Animation7" BeginTime="00:00:01.4" RepeatBehavior="Forever">
                <DoubleAnimationUsingKeyFrames Storyboard.TargetName="E07" Storyboard.TargetProperty="Opacity">
                    <LinearDoubleKeyFrame KeyTime="00:00:00.0" Value="1"/>
                    <LinearDoubleKeyFrame KeyTime="00:00:01.6" Value="0"/>
                </DoubleAnimationUsingKeyFrames>
            </Storyboard>

            <Style TargetType="Ellipse">
                <Setter Property="Fill" Value="{Binding ElementName=Root, Path=Foreground}"/>

            </Style>
        </Grid.Resources>
        <Grid.Triggers>
            <EventTrigger RoutedEvent="FrameworkElement.Loaded">
                <BeginStoryboard Storyboard="{StaticResource Animation0}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation1}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation2}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation3}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation4}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation5}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation6}"/>
                <BeginStoryboard Storyboard="{StaticResource Animation7}"/>
            </EventTrigger>
        </Grid.Triggers>

        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>

        <Ellipse x:Name="E00" Grid.Row="4" Grid.Column="0" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0"/>
        <Ellipse x:Name="E01" Grid.Row="1" Grid.Column="1" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E02" Grid.Row="0" Grid.Column="4" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E03" Grid.Row="1" Grid.Column="7" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E04" Grid.Row="4" Grid.Column="8" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E05" Grid.Row="7" Grid.Column="7" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E06" Grid.Row="8" Grid.Column="4" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
        <Ellipse x:Name="E07" Grid.Row="7" Grid.Column="1" Grid.RowSpan="3" Grid.ColumnSpan="3" Width="Auto" Height="Auto" Opacity="0" />
    </Grid>
</UserControl>

【讨论】：

谢谢。我已经进一步修改了你的，并将其包含在我的项目中。了解如何制作加载指示器真的很有帮助。
怎么用？在我的窗户里什么都没有发生？我把它写成<local1:BusyIndicator Height="40" Width="50" />

【解决方案4】：

如果你在 Vista 上运行它，你也可以只使用默认的等待光标。

this.Cursor = Cursors.Wait;

【讨论】：

【解决方案5】：

使用 BusyIndicator。这是一件银光闪闪的事情。

【讨论】：

【解决方案6】：

您可以将动画 gif 显示为加载元素

XAML

<WindowsFormsHost>
    <winForms:PictureBox x:Name="pictureBoxLoading" />
</WindowsFormsHost>

代码隐藏

pictureBoxLoading.Image = System.Drawing.Image.FromFile("images/ajax-loader.gif");

【讨论】：

好吧，我想将 winforms 程序集加载到内存中只是为了显示加载指示器可能是某种矫枉过正。