使用C#读取网站相对路径文件夹下所有图片

     public JsonResult GetCourseInitCover()
        {
            //设置相对路径
            string imgurl = Server.MapPath("~/Content/images");

            //根据相对路径，读取所有文件，并且不查找子文件夹。之后筛选格式是图片的文件
            var strs = System.IO.Directory.GetFiles(imgurl, "*.*", System.IO.SearchOption.TopDirectoryOnly).Where(s => s.EndsWith(".jpg") || s.EndsWith(".gif") || s.EndsWith(".bmp") || s.EndsWith(".png"));

            List<KeyName> filelist = new List<KeyName>();
            foreach (string file in strs)
            {
                KeyName item = new KeyName();
                //读取文件信息
                System.IO.FileInfo fi = new System.IO.FileInfo(file);
                if (fi.Extension == ".jpg" || fi.Extension == ".gif" || fi.Extension == ".bmp" || fi.Extension == ".png")
                {
                    item.Name = fi.Name;
                    filelist.Add(item);
                }
            }

            //拼装返回参数
            var result = from dir in filelist
                         select new
                         {
                             key = "/Content/images/" + dir.Name,
                             value = dir.Name.Split('.')[0]
                         };
            return Json(result, JsonRequestBehavior.AllowGet);
        }