Question

我无法获取上传文件( HTTPPostedFile) 和一个被挂载到动作的物体。我有一个类部件叫做 :

public class Widget
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FilePath { get; set; }
}

在部件控制器中,我有一个添加方法

public ActionResult Add()
{
    return View();
}

以及一种超载方法, 以接受用户后退的功能

[HttpPost]
public ActionResult Add(Widget widget, HttpPostedFile file)
{
    // Save posted file using a unique
    // Store the path/unique name in Widget.FilePath
    // Save new Widget object
    return View();
}

在《观察》中,我有以下内容:

@model Project.Models.Widget
@{
    using(Html.BeginForm())
    {
        Html.LabelFor(model => model.FirstName)<br />
        Html.TextBoxFor(model => model.FirstName)<br />
        Html.LabelFor(model => model.LastName)<br />
        Html.TextBoxFor(model => model.LastName)<br />
        <input type="file" id="file" /><br />
        <input type="submit" value="Save" />
    }
}

我想做的是让用户填写表格并选择要上传的文件。一旦文件被上传, 我要使用一个独有的名称保存文件, 然后将文件路径作为部件存储。 FilePath 。

每次我尝试时,部件对象都被覆盖, 但上传文件是空的。

任何帮助都将不胜感激。

Answer 1

你的代码有些问题

Make sure you have set the proper enctype="multipart/form-data" to your form, otherwise you won t be able to upload any files.
Make sure that your file input has a name attribute and that the value of this attribute matches the name of your action argument. Assigning an id has no effect for the server side binding.

例如:

@model Project.Models.Widget
@using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.LabelFor(model => model.FirstName)<br />
    @Html.TextBoxFor(model => model.FirstName)<br />
    @Html.LabelFor(model => model.LastName)<br />
    @Html.TextBoxFor(model => model.LastName)<br />
    <input type="file" id="file" name="file" /><br />
    <input type="submit" value="Save" />
}

确保您的控制器动作使用 HtppostedFileBase 而不是 HtppostedFile :

[HttpPost]
public ActionResult Add(Widget widget, HttpPostedFileBase file)
{
    // Save posted file using a unique
    // Store the path/unique name in Widget.FilePath
    // Save new Widget object
    return View();
}

您也可以将两个参数合并为单一视图模式:

public class Widget
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FilePath { get; set; }
    public HttpPostedFileBase File { get; set; }
}

然后:

[HttpPost]
public ActionResult Add(Widget widget)
{
    // Save posted file using a unique
    // Store the path/unique name in Widget.FilePath
    // Save new Widget object
    return View();
}

最后读到以下博客文章:http://haacked.com/archive/2010/07/16/uploaking-files- with-aspnetmvc.aspx

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