判斷文件夾中是否存在某個文件的文件

 #region 授權書是否存在
        [HttpPost]
        [ValidateInput(false)]
        public int IsExitAuthorizationByFileName(string fileName)
        {
            string path = Server.MapPath("/FileUpLoad/Authorization");
            DirectoryInfo theFolder = new DirectoryInfo(path);
            //遍历文件夹
            FileInfo[] fileInfo = theFolder.GetFiles();
            List<string> FileAuthorizationList = new List<string>();
            foreach (FileInfo NextFile in fileInfo)  //遍历文件
            {
                FileAuthorizationList.Add(NextFile.Name);
            }
            if (FileAuthorizationList.Contains(fileName) || AuthorizationRepository.IsExitAuthorizationByName(fileName) > 1)
            {
                return 1;
            }
            else
            {
                return 0;
            }
        }
        #endregion