应用另一种样式的样式触发器
我确信以前已经有人问过这个问题，但我并没有很容易地弄清楚如何表达这个查询。
我有这个风格；
<SolidColorBrush x:Key="SemiTransparentRedBrushKey">#F0FF0000</SolidColorBrush>
<Style x:Key="TextBoxEmptyError" TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text.Length}" Value="0">
<Setter Property="BorderBrush" Value="{StaticResource ResourceKey=SemiTransparentRedBrushKey}"/>
</DataTrigger>
</Style.Triggers>
</Style>
我可以将文本框应用为在文本框为空时具有红色边框。太棒了，我只需将 Style="{StaticResource TextBoxEmptyError}" 添加到控制标记即可。但是，如果我想通过触发器应用此样式，以便控件仅在某些条件下使用它（例如绑定为 true），该怎么办？像这样的东西：
<TextBox.Style>
<Style TargetType="TextBox">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ApprovedRequired}" Value="True">
<Setter Property="Style" Value="{StaticResource TextBoxEmptyError}"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
此代码抛出异常，尽管 {"Style object is not allowed tofluence the Style property of the object to which it apply."}
这样的事情可以完成吗？
编辑：如果样式触发器无法完成此操作，因为它会覆盖自身，是否有其他方法有条件地应用资源样式？
编辑：如果此操作有更合适的术语，我可以更改问题标题。
I am sure this has been asked before, but I haven't had an easy time figuring out how to phrase the query.
I have this style;
<SolidColorBrush x:Key="SemiTransparentRedBrushKey">#F0FF0000</SolidColorBrush>
<Style x:Key="TextBoxEmptyError" TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text.Length}" Value="0">
<Setter Property="BorderBrush" Value="{StaticResource ResourceKey=SemiTransparentRedBrushKey}"/>
</DataTrigger>
</Style.Triggers>
</Style>
That I can apply to Textboxes to have a red border when they are empty. Its great, I can just add Style="{StaticResource TextBoxEmptyError}" to the Control Tag. But what if I want to apply this style with a trigger, so that the control only used it under certain conditions (like a binding being true)? Something like:
<TextBox.Style>
<Style TargetType="TextBox">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ApprovedRequired}" Value="True">
<Setter Property="Style" Value="{StaticResource TextBoxEmptyError}"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
This code throws an exception though {"Style object is not allowed to affect the Style property of the object to which it applies."}
Can something like this be done?
Edit: If this cannot be done with a Style trigger because it would overwrite itself, is there another way to Conditionally apply a resource style?
Edit: I can change the question title if there is a more proper term for this action.
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样式不能从样式内的 Setter 进行设置，因为这样第一个样式基本上将永远不会存在。
由于您正在寻找验证样式，我建议您查看 Validation.ErrorTemplate，尽管如果这不起作用，您可以更改触发器，以便它修改特定属性，例如 BorderBrush 而不是 Style财产
Styles cannot be set from a Setter within the Style, because then essentially the first Style would never exist at all.
Since you're looking for a Validation style, I would recommend looking into
Validation.ErrorTemplate, although if that doesn't work you can change your trigger so it modifies specific properties such as BorderBrush instead of the Style property我会考虑使用带有 TemplateTrigger 的模板，您可以根据任何条件将样式更改为您喜欢的样式
i would think of using a Template with a TemplateTrigger and there you can change the style to what ever you like based on what ever condition