APISampleUnitTestsCS.SyntaxTrees.UpdateNode C# (CSharp) Метод

        public void UpdateNode()
        {
            string text = "class C { void M() { } }";
            var tree = SyntaxTree.ParseText(text);
            var root = (CompilationUnitSyntax)tree.GetRoot();
            MethodDeclarationSyntax method = root
                .DescendantNodes()
                .OfType<MethodDeclarationSyntax>()
                .First();
            var newMethod = method.Update(
                method.AttributeLists,
                method.Modifiers,
                method.ReturnType,
                method.ExplicitInterfaceSpecifier,
                Syntax.Identifier("NewMethodName"),
                method.TypeParameterList,
                method.ParameterList,
                method.ConstraintClauses,
                method.Body,
                method.SemicolonToken);

            root = root.ReplaceNode(method, newMethod);
            tree = SyntaxTree.Create(root, tree.FilePath, tree.Options);
            Assert.AreEqual("class C { void NewMethodName() { } }", tree.GetText().ToString());
        }