CODEWITHSUNDEEP
wpfxamldependency-properties
Morfidon
Morfidon

Reputation: 1528

Is DependcenyProperty always inherited?

Is there a mechanism that is blocking the inheritance of DependecyProperty or some values are set locally by some elements?

I have two examples that I don't understand:

<Button Background="AntiqueWhite" Height="40" Width="50" FontSize="10">
   <Button>Test</Button>            
</Button>

<TextBlock Text="Test" Background="AntiqueWhite" Height="40" Width="50" FontSize="10">
        <TextBlock />            
</TextBlock>

In Button element the child button is not inheriting background / height / width but it is inheriting fontsize even though all of the properties are DependencyProperty.

In TextBlock element situation is the same but we have another DependencyProperty (Text).

I understand how priorities work. Local value has greater priority over Inherited one. But where can i get information if a control sets something by itself? Or maybe there is some other mechanism that is preventing some DependencyProperties from being inherited?

Upvotes: 0

Views: 107

Answers (1)

Samuel
Samuel

Reputation: 6490

See this article: http://msdn.microsoft.com/en-us/library/vstudio/ms751554%28v=vs.100%29.aspx

DependencyProperties have PropertyMetadata (relevant class is FrameworkPropertyMetadata)

One of the flags described is the Inherits flag (http://msdn.microsoft.com/en-us/library/vstudio/system.windows.frameworkpropertymetadata.inherits%28v=vs.100%29.aspx)

Excerpt:

Inherits. By default, dependency properties do not inherit values. OverridesInheritanceBehavior allows the pathway of inheritance to also travel into a visual tree, which is necessary for some control compositing scenarios. NoteNote

The term "inherits" in the context of property values means something specific for dependency properties; it means that child elements can inherit the actual dependency property value from parent elements because of a WPF framework-level capability of the WPF property system. It has nothing to do directly with managed code type and members inheritance through derived types. For details, see Property Value Inheritance.

Upvotes: 1

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