using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace RCRS.WebApp.LG.EM.Models
{
 //----------------------------------------------------------------
 /// <summary>
 /// Import画面用
 /// </summary>
 //----------------------------------------------------------------
 public class tmp_UploadFile
 {
  /// <summary></summary>
  public HttpPostedFileBase FileName { get; set; }
 }
}

//----------------------------------------------------------------
  /// <summary>
  /// アップロード
  /// </summary>
  /// <returns></returns>
  //----------------------------------------------------------------
  [HttpPost]
  public virtual ActionResult UploadFile()
  {
   HttpPostedFileBase uploadedFile = Request.Files["FileName"];
   string message = "アップロード失敗しました。";
   bool isUploaded = false;
   string path = "";
   string dateTimeNow = DateTime.Now.ToString("yyMMdd-hhmmss");
   string userName = User.Identity.GetUserName();
   string uploadMsg = string.Empty;

   if (uploadedFile != null && uploadedFile.ContentLength != 0)
   {
    string pathForSaving = Server.MapPath("~/App_Data/Uploaded/");
    try
    {
     if (BsnssBihin.IsExcel(uploadedFile.FileName))
     {
      path = System.IO.Path.Combine(pathForSaving, dateTimeNow + "_" + uploadedFile.FileName);
      uploadedFile.SaveAs(path);
      isUploaded = BsnssBihin.UploadBihinChange(path, userName, ref uploadMsg);
      if (isUploaded)
      {
       message = "アップロード成功しました！" + "\n" + uploadMsg;
       Logger.Info("[成功]備品アップロード, " + dateTimeNow + ", " + "[" + userName + "]" + "[" + path + "]" + uploadMsg);
      }
      else
      {
       message = "アップロード失敗しました。" + "\n" + uploadMsg;
       Logger.Info("[失敗]備品アップロード, " + dateTimeNow + ", " + "[" + userName + "]" + "["+path + "]" + uploadMsg);
      }
     }
     else
     {
      message = "ファイルの形式は不正です。";
     }
    }
    catch (Exception ex)
    {
     message = string.Format("失敗しました: {0}", ex.Message);
     Logger.Info("[失敗]備品アップロード: " + ex.Message + dateTimeNow + ", " + "[" + userName + "]" + "[" + path + "]");
    }
   }
   return Json(new { isUploaded = isUploaded, message = message }, "text/html");
  }

@model RCRS.WebApp.LG.EM.Models.tmp_UploadFile
<table align="center" style="margin-bottom:200px">
 <tr>
  <td>
   <div style="width:470px">
    <input type="text" id="tbx-file-path" value="ファイルを選択してください" readonly="readonly" />
   </div>
  </td>
  <td>
   <div style="width: 60px">
    <span class="btn btn-primary fileinput-button">
     <span>選 択</span>
     @Html.TextBoxFor(m => m.FileName, new { id = "file-upload", type = "file", accept = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" })
    </span>
   </div>
  </td>
  <td>
   <div style="width:60px">
    <a class="btn btn-primary" href="#" id="hl-start-upload">アップロード</a>
   </div>
  </td>
 </tr>
</table>

<div id="loadingOver" class="loadingOver"></div>
<div id="dvloader" class="dvloader">
 <span class="label label-info" style="align-content:center"> 処理中、少々お待ちください</span><br />
 <br />
 <img id="loadingGif" src="/UploadFiles/2021-04-02/loader.gif">


√，就是这个样子

还附赠了一个简易loding的实现

贴出CSS代码：




.dvloader {
 display:none;
 position:absolute;
 top:40%;
 left:40%;
 width:20%;
 height:20%;
 z-index:1001;
 text-align:center;
 font-size:1.5em;
}

.loadingOver {
 display:none;
 position:absolute;
 top:0;
 left:0;
 width:100%;
 height:100%;
 background-color:#f5f5f5;
 opacity:0.5;
 z-index:1000;
}



这里，多说一嘴：

关于input 的accept属性，这里只想读入Excel，所以

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel
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