MVC 4 Razor文件上传

Question

我是MVC 4的新手,我正在尝试在我的网站上实现文件上传控制.我无法找到错误.我的文件中有空值.

控制器:

public class UploadController : BaseController
    {
        public ActionResult UploadDocument()
        {
            return View();
        }

       [HttpPost]
       public ActionResult Upload(HttpPostedFileBase file)
       {
           if (file != null && file.ContentLength > 0)
           {
               var fileName = Path.GetFileName(file.FileName);
               var path = Path.Combine(Server.MapPath("~/Images/"), fileName);
               file.SaveAs(path);
           }

           return RedirectToAction("UploadDocument");
        }
    }

视图:

@using (Html.BeginForm("Upload", "Upload", FormMethod.Post, new { enctype = "multipart/form-data" }))
{ 
    <input type="file" name="FileUpload" />
    <input type="submit" name="Submit" id="Submit" value="Upload" />
}

Answer 1

该Upload方法的HttpPostedFileBase参数必须具有相同的名称的file input.

所以只需将输入更改为:

<input type="file" name="file" />

此外,您可以在Request.Files以下位置找到这些文件:

[HttpPost]
public ActionResult Upload()
{
     if (Request.Files.Count > 0)
     {
         var file = Request.Files[0];

         if (file != null && file.ContentLength > 0)
         {
            var fileName = Path.GetFileName(file.FileName);
            var path = Path.Combine(Server.MapPath("~/Images/"), fileName);
            file.SaveAs(path);
         }
     }

     return RedirectToAction("UploadDocument");
 }

Answer 2

澄清它.模型:

public class ContactUsModel
{
    public string FirstName { get; set; }             
    public string LastName { get; set; }              
    public string Email { get; set; }                 
    public string Phone { get; set; }                 
    public HttpPostedFileBase attachment { get; set; }

发布行动

public virtual ActionResult ContactUs(ContactUsModel Model)
{
 if (Model.attachment.HasFile())
 {
   //save the file

   //Send it as an attachment 
    Attachment messageAttachment = new Attachment(Model.attachment.InputStream,       Model.attachment.FileName);
  }
}

最后用于检查hasFile的Extension方法

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

namespace AtlanticCMS.Web.Common
{
     public static class ExtensionMethods 
     {
         public static bool HasFile(this HttpPostedFileBase file)
         {
             return file != null && file.ContentLength > 0;
         }        
     }
 }

Answer 3

查看页面

@using (Html.BeginForm("ActionmethodName", "ControllerName", FormMethod.Post, new { id = "formid" }))
 { 
   <input type="file" name="file" />
   <input type="submit" value="Upload" class="save" id="btnid" />
 }

脚本文件

$(document).on("click", "#btnid", function (event) {
        event.preventDefault();
        var fileOptions = {
            success: res,
            dataType: "json"
        }
        $("#formid").ajaxSubmit(fileOptions);
    });

在控制器中

    [HttpPost]
    public ActionResult UploadFile(HttpPostedFileBase file)
    {

    }

Answer 4

你只需要更改输入字段的名称,因为参数和输入字段名称中需要相同的名称只需替换此行您的代码工作正常

 <input type="file" name="file" />