如何在C#中删除包含只读文件的目录？

using System;
using System.IO;

public class DeleteReadOnlyDirectory
{
    public static void Main()
    {
        string path = @"C:\example\readonly";

        try
        {
            DeleteReadOnly(path);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }
    }

    public static void DeleteReadOnly(string path)
    {
        foreach (string directory in Directory.GetDirectories(path))
        {
            DeleteReadOnly(directory);
        }

        foreach (string file in Directory.GetFiles(path))
        {
            File.SetAttributes(file, FileAttributes.Normal);
            File.Delete(file);
        }

        Directory.Delete(path, true);
    }
}