MVC文件上传

Question

我正在使用我的MVC应用程序，我想在我的视图中上传一个很好的文件。到目前为止，我的控制器是这样的：

&

在我看来，我想要上传文件，以便我可以在public ActionResult PickGroupForHomework(PickGroupForHomeworkViewModel model) { ClassDeclarationsDBEntities2 entities = new ClassDeclarationsDBEntities2(); model.groups = entities.Groups.ToList(); model.users = entities.Users.ToList(); if(ModelState.IsValid) { } else { model.subject_id = model.subject_id; model.groups = model.groups; model.users = model.users; return View(model); } return View(model); } 中检索它，然后将其作为文件上传到服务器上。我该怎么办？
修改
所以我将此添加到我的观点中：

if(ModelState.IsValid

但是如何将所选文件传递给模型中定义的<div class="form-group"> @Html.LabelFor(m => m.file, new { @class = "col-md-2 control-label" }) <div class="col-md-10"> <input type="file" name="file" /> </div> </div> ？ 的 EDIT2： 我现在的观点是这样的：

HttpPostedFileBase file

显然这@model ClassDeclarationsThsesis.Models.PickGroupForHomeworkViewModel @{ ViewBag.Title = "Pick Group For Homework"; } <h2>Setting homework</h2> @foreach (var user in Model.users) { if (user.email.Replace(" ", String.Empty) == HttpContext.Current.User.Identity.Name) { if (user.user_type.Replace(" ", String.Empty) == 2.ToString()|| user.user_type.Replace(" ", String.Empty) == 3.ToString()) { using (Html.BeginForm("PickGroupForHomework", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" })) { @Html.AntiForgeryToken() <hr /> <div class="form-group"> @Html.LabelFor(m => m.deadline, new { @class = "col-md-2 control-label" }) <div class="col-md-10"> @Html.TextBoxFor(m => m.deadline, new { @class = "form-control" }) </div> </div> <div class="form-group"> @Html.LabelFor(m => m.file, new { @class = "col-md-2 control-label" }) <div class="col-md-10"> <div class="editor-field"> @Html.EditorFor(m=>m.file, new { @class="col-md-2 control-label"}) @Html.ValidationMessageFor(m=>m.file) </div> </div> </div> <div class="form-group"> <div class="col-md-offset-2 col-md-10"> <input type="submit" class="btn btn-default" value="Submit" /> </div> </div> } } if (user.user_type.Replace(" ", String.Empty) == 1.ToString() ) { <p>You do not have enough permissions to enter this page. Contact the administrator.</p> } } } 会产生这样的观点：

Answer 1

要从表单上传文件，表单应该有 enctype属性，其值设置为＆＃34; multipart / form-data＆＃34;

使用此代码

@using (Html.BeginForm("PickGroupForHomework", "Account", FormMethod.Post, 
                 new {  @class = "form-horizontal",enctype = "multipart/form-data" }))
{

    <input type="file" name="file" />
    <input type="submit" />
}

这将生成form标记的html标记，enctype属性值设置为＆＃34; multipart / form-data＆＃34;