如何以编程方式更改 Setter 值 Windows Phone 中的图像

Question

我在资源字典中定义了一个如下所示的资源：

<x:Int32 x:Key="HubSectionHeaderCharacterSpacing">-10</x:Int32>
<x:Double x:Key="HubSectionHeaderFontSize">19</x:Double>
<Thickness x:Key="HubSectionHeaderMarginThickness">-1,5,0,31.5</Thickness>
<Thickness x:Key="HubSectionMarginThickness">19,0,0,0</Thickness>
<Style x:Key="MainMenuHubSectionStyle2" TargetType="HubSection">
    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="HubSection">
                <Grid Background="WhiteSmoke">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="80"/>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Grid.RenderTransform>
                        <CompositeTransform x:Name="WrappingTransform"/>
                    </Grid.RenderTransform>
                    <Viewbox HorizontalAlignment="Center" Margin="0">
                        <Image Source="ms-appx:///Assets/Logos/Logo.png" Stretch="Fill"/>
                    </Viewbox>
                    <ContentPresenter x:Name="ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" Grid.Row="1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我有一个使用这种风格的 HubSection。如何以编程方式访问此资源并替换

<Viewbox HorizontalAlignment="Center" Margin="0">
    <Image Source="ms-appx:///Assets/Logos/Logo.png" Stretch="Fill"/>
</Viewbox>

用其他图片？

Answer 1

这是一个肮脏的 hack，但由于您只有一个属性可以替换，您可以利用 Tag 属性来存储您的图像 url：

<Style x:Key="MainMenuHubSectionStyle2" TargetType="HubSection">
    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="HubSection">
                <Grid Background="WhiteSmoke">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="80"/>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Grid.RenderTransform>
                        <CompositeTransform x:Name="WrappingTransform"/>
                    </Grid.RenderTransform>
                    <Viewbox HorizontalAlignment="Center" Margin="0">
                        <Image Source="{TemplateBinding Tag}" Stretch="Fill"/>
                    </Viewbox>
                    <ContentPresenter x:Name="ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" Grid.Row="1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

那么你可以这样使用它：

<HubSection Tag="ms-appx:///Assets/Logos/Logo.png">
</HubSection>

否则，您可能必须创建自己的类型，从 HubSection 继承并添加必要的属性。

或者，您可以按照 RenDishen 的建议使用良好的数据绑定。例如：

<Style x:Key="MainMenuHubSectionStyle2" TargetType="HubSection">
    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="HubSection">
                <Grid Background="WhiteSmoke">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="80"/>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Grid.RenderTransform>
                        <CompositeTransform x:Name="WrappingTransform"/>
                    </Grid.RenderTransform>
                    <Viewbox HorizontalAlignment="Center" Margin="0">
                        <Image Source="{Binding Path=Logo}" Stretch="Fill"/>
                    </Viewbox>
                    <ContentPresenter x:Name="ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" Grid.Row="1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

然后您必须将一个具有 Logo 属性的对象分配给 HubSection 的 DataContext 属性，并相应地填充它。

如何以编程方式更改 Setter 值 Windows Phone 中的图像

How to change an Image in a Setter Value in Windows Phone programatically

c#

xaml

resourcedictionary

windows-phone

windows-8.1