Data Binding

Binding Markup Extensions

• Binding: the default binding method depending on scope or project setting, can be one of:
  • CompiledBinding
  • ReflectionBinding
• MultiBinding
• StaticResource: bind a resource for only once(on initialization)
• DynamicResource: bind and watch the change of the resource
• x:Type: reference for type, not real markup extension but has similar usage.
• x:Static: reference for static/const members, not real markup extension but has similar usage.

NOTE

Avalonia project created from dotnet template usually enabled <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault> by default. So, you don't need explicit CompiledBinding, you're already using it.

TODO: each binding markup is an extension type, how does it work? https://docs.avaloniaui.net/docs/concepts/markupextensions

Bind from Another Control

<TextBox Name="MyBox" Text="Bind me!">

<TextBlock Text="{Binding #MyBox.Text}" /> 

Relational Binding

• $parent: direct parent

<Border Tag="Hello World!">
  <TextBlock Text="{Binding $parent.Tag}" /> 
</Border>

• $parent[<idx>]: any level of indirect parent, idx is 0 based
  • $parent[0] is equivalent to $parent[0]

<Border Tag="Hello World!">
  <Border>
    <TextBlock Text="{Binding $parent[1].Tag}" /> 
  </Border>
</Border>

• $parent[<type>]: the first parent of given type

<local:MyControl Tag="Hello World!">
  <Decorator>
    <TextBlock Text="{Binding $parent[local:MyControl].Tag}" /> 
  </Decorator>
</local:MyControl>

NOTE

See Binding To Controls

Collection Binding

Bind From Code

Binding with Interpolation