Meta Programming using Roslyn (Finding all methods that don't use all the parameters)

gistfile1.cs

SyntaxTree tree = SyntaxTree.ParseText(@"int fun(int x,int z){ int y = 0; x++; return x+1;} 
                                         double funny(double x){ return x/2.13;}");
             
List<MethodDeclarationSyntax> methods = tree.GetRoot()
                                            .DescendantNodes()
                                            .Where(d => d.Kind == SyntaxKind.MethodDeclaration)
                                            .Cast<MethodDeclarationSyntax>().ToList();
methods.Select(z =>
        {
              var parameters = z.ParameterList.Parameters.Select(p => p.Identifier.ValueText);
              return new { MethodName = z.Identifier.ValueText, 
			               IsUsingAllParameter = parameters.All(x => z.Body.GetText().ToString().Contains(x))};
        })
       .Where(x => !x.IsUsingAllParameter)
       .ToList()
       .ForEach(x => Console.WriteLine(x.MethodName + " " + x.IsUsingAllParameter));