Style Selectors

Avalonia UI uses style selectors to match controls using a custom XAML syntax.

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If you are familiar with the CSS (Cascading Style Sheets) technology, then you will recognise this syntax as being very similar.

Here is a list of some example style selectors:

Style Selector	Description
Button	Selects all Button (class) controls.
Button.red	Selects all Button controls with the red style class defined.
Button.red.large	Selects all Button controls with the red and large style classes defined.
Button:focus	Selects all Button controls with the :focus pseudo class active.
Button.red:focus	Selects all Button controls with the red style class and the :focus pseudo class active.
Button#myButton	Selects a Button control with the Name (attribute) defined as "myButton".
StackPanel Button.xl	Selects all Button (class) controls with the xlclass defined; that are also descendants at any level of a StackPanel (class) control.
StackPanel > Button.xl	Selects all Button (class) controls with the xlclass defined; that are also a direct descendant of a StackPanel (class) control.
Button /template/ ContentPresenter	Selects all ContentPresenter (class) controls inside a template of a Button (class) control.

For a full description of these style selector formats, and more, see the reference here.