asp.net mvc 多檔案上傳

@{
    ViewBag.Title = "多檔案上傳測試";
}

<h2>多檔案上傳測試</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="上傳" />
</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("========================開始上傳圖檔=====================:content=" + content);


                HttpFileCollectionBase files = Request.Files;

                FileLogModel.Log("==================上傳圖檔數量為：" + files.Count+"===========================");

               if(files.Count<=0)
               {
                   FileLogModel.Log("=================無上傳圖檔===================================" );

                   return Content("0");
               }

               for (int i = 0; i < files.Count; i++)
               {
                   
            
                    HttpPostedFileBase hpf = files[i];

                    if (hpf.ContentLength <= 0)
                    {
                        continue;
                    }

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


                    FileLogModel.Log("=====================檔案字尾名:"+extension+"==========================");
                    string datename = DateTime.Now.ToString("yyyy-MM-dd");

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


                    FileLogModel.Log("=====================上傳路徑:" + path + "==========================");

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


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


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

                    hpf.SaveAs(newfilename);



                }
                FileLogModel.Log("=====================上傳成功==========================" );
                return Content("ok");
            }
            catch (Exception ex)
            {
                
                FileLogModel.Log("上傳失敗"+ex.Message );

                return Content("error");
            }
        }


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

    }
}