A Quick Guide to C# Expressions in .NET MAUI | Community Feed

Boolean converters and one-off calculated properties have been XAML’s tax for years. Tony Edwards’ MAUI UI July guide covers C# expressions in .NET MAUI — still experimental in the .NET 11 preview — and shows how source-generated expressions can keep small presentation logic next to the control that uses it.

What you’ll learn

What expressions are — C# syntax inside XAML attributes, understood by the MAUI XAML source generator (SourceGen only, not XamlC/runtime inflation)
Boolean conditions without converters — invert flags, combine predicates, and drop MultiBinding ceremony for simple enable/visible rules
Calculated values and formatting — arithmetic, string interpolation, ternaries, and null-coalescing for presentation-only text
Inline event handlers — tiny synchronous lambdas on Clicked, and why async still needs a real method or command
Explicit syntax when ambiguous — {= …}, {this.…}, and {.…} to disambiguate markup extensions vs expressions
Judgment calls — when a named property is clearer than a dense expression, and how to try the feature safely in preview

Open the full guide for the before/after XAML and the link to the official spec.