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

问题描述

我正在使用 asp.net mvc-5 HttpPostedFileBase 处理文件上传，但它显示我在选择图像后 HttpPostedFileBase 为空

这是我的代码

 <button type="submit" class="btn btn-primary col-sm-5"><span class="glyphicon glyphicon-plus"></span>

和我的控制器

 [HttpPost]公共 ActionResult 插入(HttpPostedFileBase 文件，quotecompanyquotecomp){var allowedExtensions = new[] {.Jpg"、.png"、.jpg"、jpeg"};如果(文件==空){ViewBag.message = "请选择图片";返回视图()；}别的 {ViewBag.message = "图片上传成功";返回视图()；}}

<块引用>

if (file == null)(在我上传 png 图像后，在这一行 (file) 显示我为 null)

这段代码有什么问题?

解决方案

检查表单属性

人们常犯的一个错误是缺少表单标签中的以下部分:

</表单>

同样在 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", @角色=形式"}))

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" }))

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