如何使用Roslyn以编程方式从代码中删除区域？

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;

public class RegionRemover : CSharpSyntaxRewriter
{
    public override SyntaxNode VisitRegionDirectiveTrivia(RegionDirectiveTriviaSyntax node)
    {
        // 删除区域及其内部的所有代码
        return null;
    }
}

public class Program
{
    public static void Main()
    {
        string code = @"
            using System;

            #region MyRegion
            public class MyClass
            {
                public void MyMethod()
                {
                    Console.WriteLine(""Hello, World!"");
                }
            }
            #endregion

            public class AnotherClass
            {
                // ...
            }
        ";

        SyntaxTree tree = CSharpSyntaxTree.ParseText(code);
        SyntaxNode root = tree.GetRoot();

        // 创建一个RegionRemover实例，并使用Visit方法删除区域
        RegionRemover remover = new RegionRemover();
        SyntaxNode newRoot = remover.Visit(root);

        // 获取修改后的代码
        string newCode = newRoot.ToFullString();
        Console.WriteLine(newCode);
    }
}