如何删除所有文件/文件夹，但在C#中保留根文件夹

using System;
using System.IO;

public class Program
{
    public static void Main()
    {
        string rootFolderPath = "C:\\path\\to\\root\\folder";
        
        // 调用方法删除指定根文件夹下的所有文件和文件夹
        DeleteFilesAndFolders(rootFolderPath);
        
        Console.WriteLine("删除完成。");
    }
    
    public static void DeleteFilesAndFolders(string folderPath)
    {
        // 删除文件
        foreach (string filePath in Directory.GetFiles(folderPath))
        {
            File.Delete(filePath);
        }
        
        // 递归删除子文件夹
        foreach (string subFolderPath in Directory.GetDirectories(folderPath))
        {
            DeleteFilesAndFolders(subFolderPath);
        }
    }
}

Directory.Delete(folderPath);