HTTPPostedFileBase总是在控制器中返回null [英] HTTPPostedFileBase always return null in controller

问题描述

我已经为此检查了各种答案，但是它们都不适合我，.cshtml中的代码如下:

I have checked various answer for this, but none of them works for me, my code in .cshtml is as follows:

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

然后在控制器中我拥有

 public JsonResult SaveRecord(NewAuditLetterViewModel viewModel, FormCollection all, string hvalue, HttpPostedFileBase PostedNRLFile)

始终为空，请在这方面帮助我.

Which is always null, Please help me in this.

我已经尝试过一些操作，例如在viewmodel中创建属性，这也是空的. 在我的beginform标记中也使用了new { enctype = "multipart/form-data", id = "documentForm" }. 还检查了它们只是源中的一个标签.

I have already tried few things like creating a property in viewmodel, this is also null. Also used new { enctype = "multipart/form-data", id = "documentForm" } in my beginform tag. Also checked their is only one tag in source.

推荐答案

您必须在表单标签中添加enctype = "multipart/form-data".

You have to add enctype = "multipart/form-data" in form tag.

@using (Html.BeginForm("Action", "Controller", FormMethod.Post, 
                               new { enctype = "multipart/form-data" }))

在控制器操作中尝试此c#代码

Try this c# code in controller action

if (Request.Files != null && Request.Files.Count > 0)
{
    HttpPostedFileBase file = Request.Files[0];
    if (file != null && file.ContentLength > 0)
    {
    }
}

您必须检索文件.

这篇关于HTTPPostedFileBase总是在控制器中返回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！