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4. Binding and Expression Model

Binding and Expression Model

AXSG supports multiple binding surfaces that all flow through the semantic binder.

Binding kinds

The binder resolves and emits:

• classic bindings
• compiled bindings
• selector/property mini-languages
• C# expressions and shorthand expressions
• inline C# blocks and event lambdas

Key shared packages:

• XamlToCSharpGenerator.ExpressionSemantics
• XamlToCSharpGenerator.MiniLanguageParsing.Bindings
• XamlToCSharpGenerator.MiniLanguageParsing.Selectors
• XamlToCSharpGenerator.Avalonia.Binding

Resolution model

Resolution happens in layers:

1. parse XAML markup and mini-language fragments
2. resolve XML namespaces, CLR types, and properties
3. determine source context (x:DataType, relative source, template scope, inline event scope)
4. lower the construct to generated C# and runtime helpers when needed

Runtime contract

Some forms compile to direct CLR/property access. Others compile to helper contracts in:

• XamlToCSharpGenerator.Runtime