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c#.netsourcegenerators

How to Find File Path of Class Declaration in a Source Generator

Title pretty much explains it. I am writing a source generator and would like to know how to find the file path of a given ClassDeclarationSyntax node. Here is an example of how I'd like to be able to use it.

IEnumerable<SyntaxNode> allNodes = compilation.SyntaxTrees.SelectMany(s => s.GetRoot().DescendantNodes());
IEnumerable<ClassDeclarationSyntax> allClasses = allNodes.Where(d => d.IsKind(SyntaxKind.ClassDeclaration))
                                                         .OfType<ClassDeclarationSyntax>();
IEnumerable<string> filePaths = allClasses.Select(x=> x.GetFilePath());
Solution

  • You can use the following code to get the containing file path:

    SyntaxNode node = ...;
_ = node.SyntaxTree.FilePath;
_ = node.GetLocation().SourceTree?.FilePath // SourceTree can be null