Source Generation for Expressions?

roslynadvanced

Looking for wisdom from folks who have done more with source generators and analyzers than I have.

I'm prototyping enhancements to one of the standard ReactiveUI/DynamicData operators, and it seems like an obvious candidate for source-generation. Except I'm not sure how to "hook into" source generation, so to speak....

public static IObservable<TSource> WhenExpressionChanged<TSource, TResult>(
    this    TSource                             source,
            Expression<Func<TSource, TResult>>  expression);

public static IObservable<TSource> WhenExpressionChanged<TSource, TResult>(
    this    TSource                             source,
            Expression<Func<TSource, TResult>>  expression);

using var subscription = foo
    .WhenExpressionChanged(foo => foo.Bar.Baz)
    .Subscribe(...);

using var subscription = foo
    .WhenExpressionChanged(foo => foo.Bar.Baz)
    .Subscribe(...);

Currently, the expression gets parsed and a data structure is built to allow invoking the expression dynamically, checking for implementers of

INotifyPropertyChanged

INotifyPropertyChanged

, doing null checks, etc. There's lots of reflection and lost of boxing stuff to

object

object

, so a ripe candidate for both dynamic IL generation, and for source generation.

C#•2mo ago•

25 replies

JakenVeina

Source Generation for Expressions?

roslynadvanced

public static IObservable<TSource> WhenExpressionChanged<TSource, TResult>(
    this    TSource                             source,
            Expression<Func<TSource, TResult>>  expression);

public static IObservable<TSource> WhenExpressionChanged<TSource, TResult>(
    this    TSource                             source,
            Expression<Func<TSource, TResult>>  expression);

using var subscription = foo
    .WhenExpressionChanged(foo => foo.Bar.Baz)
    .Subscribe(...);

using var subscription = foo
    .WhenExpressionChanged(foo => foo.Bar.Baz)
    .Subscribe(...);

Currently, the expression gets parsed and a data structure is built to allow invoking the expression dynamically, checking for implementers of

INotifyPropertyChanged

INotifyPropertyChanged

, doing null checks, etc. There's lots of reflection and lost of boxing stuff to

object

object

, so a ripe candidate for both dynamic IL generation, and for source generation.

Source Generation for Expressions?

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