在 DynamicResource 上使用 BasedOn 样式属性 [英] Using BasedOn Style Property on DynamicResources

问题描述

我想知道是否有一种方法可以将 wpf 样式的 basedOn 属性与动态资源一起使用.例如

i wonder if there is a way to use the basedOn property of wpf styles with dynamicresources. e.g.

<Style BasedOn="{DynamicResource somestyle}">
   <Setter Property="SomeProp" Value="SomeValue"/>
</Style>

这例如抛出一个错误，表明动态资源与 BaseOn 样式结合使用是不可能的.我想知道怎么会有人这样做?谢谢

this e.g. throws an error indicating that the usage of dynamicresources in combination with BasedOn styles is not possible. i wonder how someone could do that? thanks

推荐答案

我认为主要原因是密封对象.如果您有样式层次结构:

I think the main reason is sealed objects. If you have a Style hierarchy:

       Style A
      /       \
  Style A1  Style A2

这可能不是一个困难的场景.您使用动态资源引用 StyleA，因此每当该资源发生变化时，Style A1 和 Style A2 应更改它们的 BasedOn属性.但是，一旦在您的应用程序中使用了 Style，它就会成为一个密封对象.Style A 变得不可变.

this might not be a difficult scenario. You refer to StyleA using a dynamic resource, so whenever that resource changes, Style A1 and Style A2 should change their BasedOn property. However, once a Style is being used in your application, it becomes a sealed object. Style A becomes immutable.

您可以使用的一种解决方法是:

One workaround you can use is:

1. Style A 需要改变.
2. 创建一个新的 Style 对象，该对象将成为新的 Style A 资源.
3. 创建Style A1 和Style A2 的新版本.您需要编写一个复制过程来复制所有 Setters、Resources 等.将 BasedOn 设置为新版本的样式 A.
4. 更新资源集合，以便在其中包含三种新样式.

1. Style A needs to change.
2. Create a new Style object that is going to be the new Style A resource.
3. Create a new version of Style A1 and Style A2. You'd need to write a copy procedure that makes copies of all the Setters, Resources, etc. Set the BasedOn to the new version of Style A.
4. Update the resources collection so that the three new styles are in there.

{DynamicResource StyleA1} 和 {DynamicResource StyleA2} 现在应该知道这些资源发生了变化(从第 4 步开始)并自动更新任何引用.

{DynamicResource StyleA1} and {DynamicResource StyleA2} should now pick up the fact that those resources changes (from step 4) and update any references automatically.

请注意，这是一个非常简单的场景.现实世界风格的层次结构可能更复杂，尤其是当它们分布在多个文件中并且来自合并的字典时.

Note that this is a very simple scenario. Real world style hierarchies can be more complex, especially if they are spread across multiple files and come from merged dictionaries.

希望我理解您的问题并提供帮助.

Hope I understood your problem and helped out.

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