private static IEnumerable<ITypeSymbol> GetReferencedTypes(SyntaxNode classDeclaration, ISymbol sourceSymbol, SemanticModel semanticModel)
{
var typeSyntaxes = classDeclaration.DescendantNodesAndSelf().OfType<TypeSyntax>();
var commonSymbolInfos = typeSyntaxes.Select(x => semanticModel.GetSymbolInfo(x)).AsArray();
var members = commonSymbolInfos
.Select(x => x.Symbol)
.Where(x => x != null)
.Select(x =>
{
var typeSymbol = x as ITypeSymbol;
return typeSymbol == null ? x.ContainingType : x;
})
.Cast<ITypeSymbol>()
.WhereNotNull()
.DistinctBy(x => x.ToDisplayString())
.Where(x => x != sourceSymbol)
.AsArray();
return members;
}
}
