asp.net-mvc 表单提交时模型为空
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Model is null when form submitted
提问by Shimmy Weitzhandler
When I hit submit, the fileparameter is null.
当我点击提交时，file参数为空。
public ActionResult Create()
{
return View(new FileViewModel());
}
[HttpPost]
[InitializeBlobHelper]
public ActionResult Create(FileViewModel file)
{
if (ModelState.IsValid)
{
//upload file
}
else
return View(file);
}
public class FileViewModel
{
internal const string UploadingUserNameKey = "UserName";
internal const string FileNameKey = "FileName";
internal const string Folder = "files";
private readonly Guid guid = Guid.NewGuid();
public string FileName
{
get
{
if (File == null)
return null;
var folder = Folder;
return string.Format("{0}/{1}{2}", folder, guid, Path.GetExtension(File.FileName)).ToLowerInvariant();
}
}
[RequiredValue]
public HttpPostedFileBase File { get; set; }
}
Here is the cshtml:
这是cshtml：
@model MyProject.Controllers.Admin.FileViewModel
@{
ViewBag.Title = "Create";
Layout = "~/Views/Shared/_BackOfficeLayout.cshtml";
}
@using (Html.BeginForm("Create", "Files", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<fieldset>
<legend>Create</legend>
<div class="editor-label">
@Html.LabelFor(model => model.File)
</div>
<div class="editor-field">
@Html.TextBoxFor(model => model.File, new { type = "file" })
@Html.ValidationMessageFor(model => model.File)
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
回答by webdeveloper
It's naming conflict and binder trying to bind your File property to FileViewModel object with file name, that's why you get null. POST names are case-insensitive.
命名冲突和绑定器试图将您的 File 属性绑定到具有文件名的 FileViewModel 对象，这就是为什么您会得到空值。POST 名称不区分大小写。
Change:
改变：
public ActionResult Create(FileViewModel file)
To:
到：
public ActionResult Create(FileViewModel model)
or to any other name
或任何其他名称
回答by ransems
This solved my issue as well. It was a name that I was using that was similar to the model, which was similar to the variable I assigned the posted model too. once I sorted out the field name all worked as expected.
这也解决了我的问题。这是我使用的一个类似于模型的名称，它也类似于我分配给发布的模型的变量。一旦我整理出字段名称，一切都按预期工作。
Of course the error was not helpful in pointing this out.
当然，错误对指出这一点没有帮助。
