C# 清空文件夹

   /// <summary>
        /// 清空文件夹
        /// </summary>
        /// <param name="dir"></param>
        public void DeleteFolder(string dir)
        {
            foreach (string d in Directory.GetFileSystemEntries(dir))
            {
                if (File.Exists(d))
                {
                    FileInfo fi = new FileInfo(d);
                    if (fi.Attributes.ToString().IndexOf("ReadOnly") != -1)
                        fi.Attributes = FileAttributes.Normal;
                    File.Delete(d);//直接删除其中的文件 
                }
                else
                {
                    DirectoryInfo d1 = new DirectoryInfo(d);
                    if (d1.GetFiles().Length != 0)
                    {
                        DeleteFolder(d1.FullName);////递归删除子文件夹
                    }
                    Directory.Delete(d);
                }
            }
        }