Question

我正在创建一个MVC应用程序，我想在视图之间传递数据这是我的第一个观点：

@model ClassDeclarationsThsesis.Models.AddGroupViewModel

@{
    ViewBag.Title = "Add Groups";
}

<h2>Add Groups to subjects</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) == 3.ToString() || user.user_type.Replace(" ", String.Empty) == 2.ToString())
        {
            using (Html.BeginForm("AddGroup", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
            {
                @Html.AntiForgeryToken()
                <h4>Create new groups.</h4>
                <hr />
                @Html.ValidationSummary("", new { @class = "text-danger" })
                <div class="form-group">
                    @{
                        List<SelectListItem> listItems1 = new List<SelectListItem>();

                    }
                    @foreach (var subject in Model.Subjects)
                    {
                        listItems1.Add(new SelectListItem
                        {
                            Text = subject.name,
                            Value = subject.name,
                            Selected = true
                        });
                    }
                    @Html.LabelFor(m => m.subject_name, new { @class = "col-md-2 control-label" })
                    <div class="col-md-10">
                        @Html.DropDownListFor(m => m.subject_name, listItems1, new { @class = "form-control" })
                    </div>
                </div>
                <div class="form-group">
                    @Html.LabelFor(m => m.qty, new { @class = "col-md-2 control-label" })
                    <div class="col-md-10">
                        @Html.TextBoxFor(m => m.qty, new { @class = "form-control" })
                    </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>
                                }

                            }
                        }

我的控制器：

public ActionResult AddGroup(AddGroupViewModel model)
{
    var entities = new ClassDeclarationsDBEntities1();
    var model1 = new AddGroupViewModel();
    model1.Subjects = entities.Subjects.ToList();
    model1.Users = entities.Users.ToList();
    // set your other properties too?


    if (ModelState.IsValid)
    {

        return RedirectToAction("AddGroupsQty", "Account");
    }
    return View(model1);
}

我想要实现的是将所选项目从下拉列表和此qty变量传递到AddGroupsQty View。我该怎么做呢？在我的AddGroupsQty控制器中，我到目前为止只有一个简单的视图返回。

Answer 1

您可以使用querystring传递值。

return RedirectToAction("AddGroupsQty", "Account", 
                                         new { qty=model.qty,subject=model.subject_name);

假设您的AddGroupsQty有两个参数来接受数量和主题

public ActionResult AddGroupsQty(int qty,string subject)
{
  // do something with the parameter
  // to do : return something
}

这将使浏览器使用查询字符串中的值发出新的GET请求。如果您不喜欢这样做，您可以使用服务器端临时持久性mecahnism，如TempData

TempData["qty"]=model.qty;
TempData["subject"]= model.subject_name;
return RedirectToAction("AddGroupsQty", "Account");

在您的AddGroupsQty行动中，

public ActionResult AddGroupsQty()
{
  int qty=0;
  string subjectName=string.Empty;
  if(TempData["qty"]!=null)
  {
    qty = Convert.ToInt32(TempData["qty"]);
  }
  if(TempData["subject"]!=null)
  {
    subjectName = TempData["subject"];
  }
  // Use this as needed
  return View();
}

如果要将这些值从ADdGroupsQty操作传递到它的视图，可以使用视图模型或ViewBag / ViewData。

在MVC应用程序中的多个视图之间传递数据

1 个答案: