asp.net mvc-5 HttpPostedFileBase为null [英] asp.net mvc-5 HttpPostedFileBase is null

问题描述

我正在用文件上传使用asp.net mvc-5 HttpPostedFileBase ，但它显示我HttpPostedFileBase为空后我选择图像

这里是我的代码

 < input type =filetitle =search imagefile-model =profileimageid =allfilepathname =file/> 
< button type =submitclass =btn btn-primary col-sm-5> 
< span class =glyphicon glyphicon-plus>< / span> 
< / button> 
  

和我的控制器

  [HttpPost] 
 public ActionResult insert（HttpPostedFileBase file，quotation company quotecomp）
 {
 var allowedExtensions = new [] {
.Jpg，。 png，.jpg，jpeg
}; 
 if（file == null）
 {
 ViewBag.message =请选择图片; 
 return View（）; 
} 
 else {
 ViewBag.message =图片已成功上传; 
 return View（）; 
 
 
 
 
 
lockquote 
 
如果（文件== null）（在这一行（文件）显示我空我后上传PNG图像）
 
 
这段代码有什么错误？ 
 
解决方案
 
检查表单属性
 
 
 
人们犯的一个常见错误是在表单标记中缺少以下部分： 
 
 
  < form enctype =multipart / form-data> 
< / form> 
  
在MVC中，您的表单结构可能看起来像这样 
 
 
  @using（Html.BeginForm（Action，Controller，FormMethod.Post，new {@ enctype =multipart / form-data，@id = myForm，@ role =form}））
  
 
i am messing around with file uploading using asp.net mvc-5 HttpPostedFileBase but it is showing me HttpPostedFileBase is null after i am selecting the image

here is my code
 <input type="file" title="search image" file-model="profileimage" id="allfilepath" name="file" />
 <button type="submit" class="btn btn-primary col-sm-5">
         <span class="glyphicon glyphicon-plus"></span>
 </button>
and my controller
    [HttpPost]
    public ActionResult insert(HttpPostedFileBase file, quotationcompany quotecomp)
    {
        var allowedExtensions = new[] {
        ".Jpg", ".png", ".jpg", "jpeg"
    };
        if (file == null)
        {
            ViewBag.message = "Please Select Image";
            return View();
        }
        else {
            ViewBag.message = "Image Uploaded Successfully";
            return View();
        }

    }



  
if (file == null)(on this line (file) is showing me null after i am uploading png image)
what is wrong in this code?
解决方案
Check Form Attributes

A common mistake people make is missing the following part in the form tag:
<form enctype="multipart/form-data">
</form>
Also in MVC your form structure could look something like this
@using (Html.BeginForm("Action", "Controller", FormMethod.Post, new { @enctype = "multipart/form-data", @id = "myForm", @role="form" }))


                        
这篇关于asp.net mvc-5 HttpPostedFileBase为null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！