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

问题描述

我有1字符串属性一个简单的模型，我上呈现一个简单的看法。

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，当我提出，该模型被打填充，但第二个参数是HttpPostedFileBase为null。但是这样做的时候Request.Files - 它似乎表明有被张贴在申请文件中。
我怎样才能真正得到的第二个参数绑定？

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

为什么不上传的文件添加到你的模型是这样的：

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
}

那么你的观点改成这样：

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

那么你的文件将被调回如下：

Then your files will be posted back as follows:

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

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