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我曾经有一个用于上传文件的表单，它工作正常，但令我惊讶的是，它不再将 HttpPostedFileBase 绑定到模型。过了一会儿，我意识到这是因为我已经从

@using (Html.BeginForm("AddDocument", "Documents", FormMethod.Post, new { enctype = "multipart/form-data", @class = "addTab" }))

至

@using (Html.BeginForm("AddDocument", "Documents", FormMethod.Post, new { @id = "addForm", enctype = "multipart/form-data", @class = "addTab" }))

所以我改为（我尝试只删除id的@，但它也没有工作）

@using (Html.BeginForm("AddDocument", "Documents", new {id= "addForm"}, FormMethod.Post, new { enctype = "multipart/form-data", @class = "addTab" }))

它再次起作用。

所以我认为我做了很多错误的事情，我已经改变了我的解决方案中的其他形式。但事实证明，如果我使用

@using (Html.BeginForm("Edit", "Events", new {id = "editForm"}, FormMethod.Post, new { @class = "addTab" }))

代替

@using (Html.BeginForm("AddContact", "Contacts", FormMethod.Post, new { @id = "addForm", @class = "addTab" }))

我无法设置 ID（也无法使用其他选项）

我正在尝试通过msdn 文档下定决心，但我什至不知道 id 是否应该被视为路由值或 html 属性，@ 的用途，有时使用有时不使用，特别是为什么我丢失了多部分情况下的绑定

更新：

这是视图（我尝试使用具有相同结果的注释掉的代码）：

@model AddDocumentViewModel

@using (Html.BeginForm("AddDocument", "Documents", new {id= "addForm"}, FormMethod.Post, new { enctype = "multipart/form-data", @class = "addTab" }))
{   
    @Html.ValidationSummary(true, "Please correct the errors and try again.")
    <div id="addDocumentdetails">
        <div>

            @*<input id="File" type="file" name="File" data-val-required="Please select a file" data-val="true" />*@
            @*@Html.ValidationMessage("File")*@
            @Html.TextBoxFor(m => m.File, new { type = "file" })
            @Html.ValidationMessageFor(m => m.File)
            <span class="right">@Html.DropDownListFor(m => m.OwnedItemId, Model.Plans, "Not attached to a plan..")</span>
        </div>
        <div>
            @Html.EditorFor(m => m.Description,
                                new { @class = "addNotes", data_placeholders_focus = "false", placeholder = ViewData.ModelMetadata.Watermark })
            @Html.ValidationMessageFor(m => m.Description)
        </div>
    </div>
    <div class="addDEC">
        <input class="addDECButton" type="submit" value="Save" />
    </div>
}

视图模型：

public class AddDocumentViewModel
{
    [Display(Prompt = "Document notes")]
    [DataType(DataType.MultilineText)]
    [StringLength(500, ErrorMessage = "Must be 500 characters or less")]
    public string Description { get; set; }

    public int? OwnedItemId { get; set; }

    public IEnumerable<SelectListItem> Plans { get; set; }

    [Required(ErrorMessage = "Select a file")]
    public HttpPostedFileBase File { get; set; }

控制器

[HttpGet]
public ActionResult AddDocument()
{
    var partyId = (int)Session["PartyId"];
    var viewModel = _createBuilder.Build(partyId);
    return PartialView("_AddDocument", viewModel);
}

[HttpPost]
public ActionResult AddDocument(AddDocumentViewModel viewModel)
{
    var partyId = (int)Session["PartyId"];

    if (ModelState.IsValid)
    {
        _documentsManager.AddDocument(viewModel, partyId);

        if (Request.IsAjaxRequest())
            return Json(new { passedValidation = true, action = Url.Action("DocumentList") });

        return RedirectToAction("Index");
    }

    var newViewModel = _createBuilder.Rebuild(viewModel, partyId);
    return PartialView("_AddDocument", newViewModel);

}
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