asp.net mvc 多文件上传

@{
    ViewBag.Title = "多文件上传测试";
}

<h2>多文件上传测试</h2>

<form action="/Demo/Index" method="post" enctype="multipart/form-data">
    <input type="file"  /><br />
    <input type="file" /><br />
    <input type="file" /><br />
    <input type="submit" value="上传" />
</form>

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ZhaoWoAPI.Models;

namespace ZhaoWoAPI.Controllers
{
    public class DemoController : Controller
    {

        [HttpPost]
        public ActionResult Index(string content)
        {

            try
            {
                FileLogModel.Log("========================开始上传图片=====================:content=" + content);

                HttpFileCollectionBase files = Request.Files;

                FileLogModel.Log("==================上传图片数量为：" + files.Count+"===========================");

               if(files.Count<=)
               {
                   FileLogModel.Log("=================无上传图片===================================" );

                   return Content("");
               }

               for (int i = ; i < files.Count; i++)
               {

                    HttpPostedFileBase hpf = files[i];

                    if (hpf.ContentLength <= )
                    {
                        continue;
                    }

                    var extension = Path.GetExtension(hpf.FileName);

                    FileLogModel.Log("=====================文件后缀名:"+extension+"==========================");
                    string datename = DateTime.Now.ToString("yyyy-MM-dd");

                    string path = Server.MapPath("/Resource/SendInfo/" + datename + "/");

                    FileLogModel.Log("=====================上传路径:" + path + "==========================");

                    if (!Directory.Exists(path))
                    {
                        Directory.CreateDirectory(path);
                    }

                    string newfilename = path + ZhaoWoCommon.GUIDTools.GetGUID() + extension;

                    FileLogModel.Log("=====================完整路径:" + newfilename + "==========================");

                    hpf.SaveAs(newfilename);

                }
                FileLogModel.Log("=====================上传成功==========================" );
                return Content("ok");
            }
            catch (Exception ex)
            {

                FileLogModel.Log("上传失败"+ex.Message );

                return Content("error");
            }
        }

        public ActionResult Test()
        {
            return View();
        }

    }
}