APISampleUnitTestsCS.FAQ.DeleteRegions C# (CSharp) Метод

        public void DeleteRegions()
        {
            var tree = SyntaxTree.ParseText(@"
            using System;
            #region Program
            class Program
            {
            static void Main()
            {
            }
            }
            #endregion
            #region Other
            class C
            {
            }
            #endregion");
            SyntaxNode oldRoot = tree.GetRoot();

            // Get all RegionDirective and EndRegionDirective trivia.
            IEnumerable<SyntaxTrivia> trivia = oldRoot.DescendantTrivia()
                .Where(t => t.Kind == SyntaxKind.RegionDirectiveTrivia ||
                            t.Kind == SyntaxKind.EndRegionDirectiveTrivia);

            SyntaxNode newRoot = oldRoot.ReplaceTrivia(oldTrivia: trivia,
                computeReplacementTrivia:
                    (originalTrivia, originalTriviaWithReplacedDescendants) => SyntaxTriviaList.Empty);

            Assert.AreEqual(@"
            using System;
            class Program
            {
            static void Main()
            {
            }
            }
            class C
            {
            }
            ", newRoot.ToFullString());
        }