带有模型的 mvc 上传文件 - 第二个参数发布的文件为空 [英] mvc upload file with model - second parameter posted file is null

问题描述

我有一个带有 1 个字符串属性的简单模型，我将其呈现在一个简单的视图上.

I have a simple model with 1 string property which I render on a simple view.

视图如下所示:

@using (Html.BeginForm("UploadFile", "Home", FormMethod.Post, new { encType="multipart/form-data" }))
{
    @Html.TextBoxFor(m => m.FirstName)
    <br /><br />

    <input type="file" name="fileUpload" /><br /><br />
    <input type="submit" value="submit me" name="submitme" id="submitme" />
}

控制器是这样的:

[HttpPost]
public ActionResult UploadFile(UploadFileModel model, HttpPostedFileBase file)
{
   // DO Stuff
   return View(model);
}

现在，当我提交时，模型确实被填充，但 HttpPostedFileBase 的第二个参数为空.但是，在执行 Request.Files 时 - 它似乎确实显示正在发布的请求中有一个文件.我怎样才能真正获得要绑定的第二个参数?

Now, when I submit, the model DOES get populated but the second parameter being HttpPostedFileBase is null. However when doing Request.Files - it does seem to show there is a file in the Request being posted. How can I actually get the second parameter to bind?

推荐答案

为什么不像这样将上传的文件添加到您的模型中:

Why not add the uploaded files to your model like this:

public class UploadFileModel 
{
    public UploadFileModel()
    {
        Files = new List<HttpPostedFileBase>();
    }

    public List<HttpPostedFileBase> Files { get; set; }
    public string FirstName { get; set; }
    // Rest of model details
}

然后将您的视图更改为:

Then change your view to this:

@using (Html.BeginForm("UploadFile", "Home", FormMethod.Post, new { encType="multipart/form-data" }))
{
    @Html.TextBoxFor(m => m.FirstName)
    <br /><br />

    @Html.TextBoxFor(m => m.Files, new { type = "file", name = "Files" })<br /><br />
    <input type="submit" value="submit me" name="submitme" id="submitme" />
}

然后您的文件将按如下方式回发:

Then your files will be posted back as follows:

public ActionResult UploadFile(UploadFileModel model)
{
    var file = model.Files[0];
    return View(model);
}

这篇关于带有模型的 mvc 上传文件 - 第二个参数发布的文件为空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！