unity 获取文件夹里面有多少个png图片

//using System.IO;
string filePath= Application.dataPath+ "/新建文件夹";
 if (Directory.Exists(filePath)) {//判断这个路径是否存在
            DirectoryInfo direction = new DirectoryInfo(filePath);
            files = direction.GetFiles("*.png", SearchOption.AllDirectories);
        }

        Debug.Log(files.Length );