Get Syntax Tree from SymbolAnalysisContext

Question

I need to access the syntax tree (the complete source file text) from a given SymbolAnalysisContext. I found that I can call context.Compilation.SyntaxTrees but which one to pick from these? Is there another way?

Answer 1

A symbol can be defined in one or more SyntaxTrees, or in Metadata (by reference). You can get all of them via ISymbol.Locations, which:

Gets the locations where the symbol was originally defined, either in source or metadata. Some symbols (for example, partial classes) may be defined in more than one location.

If you're only interrested in the ones defined in your sources, you can do something like this:

var syntaxTrees = from x in context.Symbol.Locations
                  where x.IsInSource
                  select x.SourceTree;