遍历文件夹C#

List ls = new List();
string path = @“E:”;

       DirectoryInfo dir = new DirectoryInfo(path);

        if (dir.Exists)
       {
            DirectoryInfo dirD = dir as DirectoryInfo;
            FileSystemInfo[] files = dirD.GetFileSystemInfos();
            foreach (var item in files)
           {
                ls.Add(item.Name);
            }
       }
        else
        {
           ls.Add("无");
        }