How do I override style in a specific theme

I'm trying to override the default style of a base control (TextBox, ComboBox) in a theme-file. Like this:

in themes/classic.xaml

<Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}">
    <Setter Property="Background" Value="Black"/>
</Style>

in themes/Aero.NormalColor.xaml

<Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}">
    <Setter Property="Background" Value="Green"/>
</Style>

But this doesn't seem to work. I always get the defaulted style with no changes. I even tried it with a specific key like

<Style x:Key="DefaultTextBoxStyle" TargetType="{x:Type TextBox}" BasedOn="{StaticReso开发者_如何学运维urce {x:Type TextBox}}">
    <Setter Property="Background" Value="Green"/>
</Style>

and always use this key when declaring the control in xaml. Nothing seems to work.

If I put the style in the application.xaml file I have no problem but I want this style to be theme dependent. By the way, it works well with my own usercontrols.

Can someone tell me what I'm doing wrong here?

I know one solution could be to use a class to see wich theme I use and to use a trigger of somesort, but I really wanted to do this in xaml.

Thanks

Did you reference your theme somewhere? e.g.

<Application
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Test.App">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Simple Styles.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

Also, don't use the x:Key in themes unless it's just a sub-style that is referenced inside the theme by another style.

Unfortunately, the ThemeInfo mechanism is only used for controls defined in the same assembly. What you want is to load theme-specific resources for controls that are not your own. I haven't tested it but I think what you need is the ThemeDictionary Markup Extension. A ThemeDictionary loads a theme-appropriate ResourceDictionary from an assembly.

Here is someone who go it to work statically, which appears to be what you want.

The problem is that you are getting circular references. This is because you define a style with class XXX, but also use the same resource as base resource.

I have wrote a blog article about this a "long" time ago, it explains what to do:

http://blog.catenalogic.com/post/2009/07/20/Override-or-customize-WPF-themes-such-as-PresentationFrameworkAero.aspx

The trick is to define a style in the same resource dictionary with the key "DefaultTextBoxStyle", and then programatically add the styles with the right key ("{x:Type TextBox}" the to main application resource. This way, you avoid the circular references.