APISampleUnitTestsCS.FAQ.UseSyntaxAnnotations C# (CSharp) Метод

        public void UseSyntaxAnnotations()
        {
            var tree = SyntaxTree.ParseText(@"
            using System;
            class Program
            {
            static void Main()
            {
            int i = 0; Console.WriteLine(i);
            }
            }");

            // Tag all tokens that contain the letter 'i'.
            var rewriter = new MyAnnotator();
            SyntaxNode oldRoot = tree.GetRoot();
            SyntaxNode newRoot = rewriter.Visit(oldRoot);

            Assert.IsFalse(oldRoot.ContainsAnnotations);
            Assert.IsTrue(newRoot.ContainsAnnotations);

            // Find all tokens that were tagged with annotations of type MyAnnotation.
            IEnumerable<CommonSyntaxNodeOrToken> annotatedTokens = newRoot.GetAnnotatedNodesAndTokens<MyAnnotation>();
            var results = string.Join("\r\n",
                annotatedTokens.Select(nodeOrToken =>
                {
                    Assert.IsTrue(nodeOrToken.IsToken);
                    MyAnnotation annotation = nodeOrToken.GetAnnotations<MyAnnotation>().Single();
                    return string.Format("{0} (position {1})", nodeOrToken.ToString(), annotation.Position);
                }));

            Assert.AreEqual(@"using (position 2)
            static (position 4)
            void (position 2)
            Main (position 2)
            int (position 0)
            i (position 0)
            WriteLine (position 2)
            i (position 0)", results);
        }