public bool NeedDownloadThan(AssetBundleVersion _c)
        {
            bool _need = true;

            _need &= !IsNewThan(_c);
            _need &= !IsEquals(_c);
            return(_need);
        }
 public bool IsEquals(AssetBundleVersion _c)
 {
     return(crc == _c.crc);
 }
 /// <summary>
 /// 对比传入的信息,判断是否是更新的文件
 /// </summary>
 public bool IsNewThan(AssetBundleVersion _c)
 {
     return(this.version > _c.version);
 }