Roslyn analyzer: Is class marked as partial

Question

Is there a way to find out whether class is partial inside Roslyn analyzer? There is a PartialImplementationPart in IMethodSymbol, but nothing similar for INamedTypeSymbol.

I'm writing a Source Generator, and I want to generate second part of the class only if it's possible (if first part is partial).

Fukuoka

Answer 1

You could use the Modifier List to check if the class is partial.

var isPartial = classDeclaration.Modifiers
                                .Any(m => m.IsKind(SyntaxKind.PartialKeyword));

Papillose

This does not answer the question: how to get this from an INamedTypeSymbol? – Buster

I got errors about lambda expressions. I needed to use classDeclaration.Modifiers.Any(SyntaxKind.PartialKeyword);. You didn't specify above but in my case classDeclaration is a ClassDeclarationSyntax. – Flog

Answer 2

If you have an INamedTypeSymbol, you need to check its declarations in syntax:

typeSymbol.DeclaringSyntaxReferences.Any(syntax => syntax.GetSyntax() is BaseTypeDeclarationSyntax declaration && declaration.Modifiers.Any(modifier => modifier.IsKind(SyntaxKind.PartialKeyword))))

Flashgun

Answer 3

You can also look at ISymbol.Locations if you only have access to the ISymbol - more than one location is a pretty good indicator that it's a partial class.

Koralle