是否有可能设置在XAML的风格，选择性地影响控制？ [英] Is it possible to set a style in XAML that selectively affects controls?

问题描述

在＆LT; Window.Resources＆GT; 我已经定义了以下样式：

In <Window.Resources> I have defined following style:

    <Style x:Key="textBlockStyle" TargetType="TextBlock">
        <Setter Property="Margin" Value="5,0,5,0"/>
    </Style>

我已经定义了一些网格，我有四个的TextBlocks ：

    <WrapPanel>
        <TextBlock Style="{StaticResource textBlockStyle}">Server</TextBlock>
        <TextBlock Style="{StaticResource textBlockStyle}">IP</TextBlock>
        <TextBlock Style="{StaticResource textBlockStyle}">Port</TextBlock>
        <TextBlock Style="{StaticResource textBlockStyle}">Status</TextBlock>
    </WrapPanel>

问题：我需要引用 textBlockStyle 四次

问：是否有可能设置的风格只有一次在 WrapPanel中或其他地方不重复引用样式

Question: Is it possible to set that style just once at in WrapPanel or somewhere else without repeating the reference to the style?

也许是这样的：

    <WrapPanel Style="{StaticResource textBlockStyle}">
        <TextBlock>Server</TextBlock>
        <TextBlock>IP</TextBlock>
        <TextBlock>Port</TextBlock>
        <TextBlock>Status</TextBlock>
    </WrapPanel>

我不是在寻找一个全球性的解决方案我可以删除 X：！关键=textBlockStyle属性，但是会影响到所有的的TextBlocks 在窗口中。我需要一个更具有选择性的机制，但是没有说难听code复制。

I am not searching for a global solution! I could delete that x:Key="textBlockStyle" property, but that would affect all TextBlocks in the Window. I need a more selective mechanism, but without that ugly code duplication.

推荐答案

您有几种选择，$ P $这里psented为了对他们如何进行扩展。

You have several options, presented here in order of how well they scale.

选项1：定义样式，而不在一个较低的水平的关键

您可以贴在 WrapPanel中级别的资源，使其只影响内部控制 WrapPanel中：

You can stick the resource at the WrapPanel level so that it only affects controls inside that WrapPanel:

<WrapPanel>
    <WrapPanel.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="Margin" Value="5,0,5,0"/>
        </Style>
    </WrapPanel.Resources>

    <!-- TextBlocks here -->
</WrapPanel>

注意缺少关键的。这风格将适用于所有的TextBlock 秒内的 WrapPanel中

Notice the lack of key. This Style will apply to all TextBlocks within the WrapPanel.

选项2：定义风格的关键，再没有在一个较低的水平

如果您定义的风格在更高层次上带有一键，你就可以定义另一个风格在不用钥匙较低的水平，而基地风格在较高的水平之一：

If you define the Style at a higher level with a key, you can then define another Style at a lower level without a key, and base that Style on the higher level one:

<Window>
    <Window.Resources>
        <Style TargetType="TextBlock" x:Key="textBlockStyle">
            <Setter Property="Margin" Value="5,0,5,0"/>
        </Style>
    </Window.Resources>

    <WrapPanel>
        <WrapPanel.Resources>
            <Style TargetType="TextBlock" BasedOn="{StaticResource textBlockStyle"/>
        </WrapPanel.Resources>

        <!-- TextBlocks here -->
    </WrapPanel>
</Window>

这导致了风格 S内部的 WrapPanel中<被自动应用到的TextBlock / code>，而不是外部。另外，你不要复制风格的细节 - 它们被存储在一个较高的水平。

This results in a Style being automatically applied to TextBlocks inside the WrapPanel, but not outside it. Also, you don't duplicate the details of the Style - they are stored at a higher level.

方法3：将在ResourceDictionary中的样式，并选择将其合并

最后，你可以把你的风格 S在一个单独的的ResourceDictionary 并有选择地合并词典到控制的资源系列：

Finally, you can place your Styles in a separate ResourceDictionary and selectively merge that dictionary into a control's Resources collection:

<!-- TextBlockStyles.xaml -->
<ResourceDictionary>
    <Style TargetType="TextBlock">
        <Setter Property="Margin" Value="5,0,5,0"/>
    </Style>
</ResourceDictionary>

<!-- Window.xaml -->
<Window>
    <WrapPanel>
        <WrapPanel.Resources>
            <ResourceDictionary>
                <ResourceDictionary.MergedDictionaries>
                    <ResourceDictionary Source="TextBlockStyles.xaml"/>
                </ResourceDictionary.MergedDictionaries>
            </ResourceDictionary>
        </WrapPanel.Resources>
    </WrapPanel>
</Window>

<!-- Alternative Window.xaml if you have only one RD to merge in -->
<Window>
    <WrapPanel>
        <WrapPanel.Resources>
            <ResourceDictionary Source="TextBlockStyles.xaml"/>
        </WrapPanel.Resources>
    </WrapPanel>
</Window>

现在，你可以在不同的字典定义，只要你喜欢尽可能多样式集，然后选择性地将它们应用到你的元素树。

Now you can have as many style sets defined in separate dictionaries as you like, and then selectively apply them to your element tree.

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