Question

具有键'WorkStations'的ViewData项的类型为'System.String'，但必须是'IEnumerable'类型。

这是我得到的错误，我得到了droplist发送的值，但是当它尝试将它添加到数据时它只是崩溃并且我得到了我写的abow错误。

我已尝试将html标记更新为

@ Html.DropDownList（“WorkStations”，（SelectList）ViewBag.WorkStations）

这是我的模特

namespace MvCfirstproject.Models
{
    [Table("WorkHoursModels")]
    public class WorkhoursModels
    {
        public int Id { get; set; }
        public string Start { get; set; }
        public string Stop { get; set; }
        public string command { get; set; }
        public string Users { get; set; }
        public string WorkStations { get; set; }


    }
    [Table("WorkStations")]
    public class WorkHoursStation
    {
        public int Id { get; set; }
        public string WorkStations { get; set; }
        public IEnumerable<SelectListItem> Workstations { get; set; }
    }


    public class WorkhourDB : DbContext 
    {
        public DbSet<WorkhoursModels> WorkHours { get; set; }
        public DbSet<WorkHoursStation> WorkStation { get; set; }
    }
}

这是我的控制器

    public ActionResult Create()
    {
        ViewBag.WorkStations = new SelectList(db.WorkStation, "WorkStations", "Workstations");
        return View();
    }

    //
    // POST: /Default1/Create

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create(WorkhoursModels workhoursmodels)
    {
        if (workhoursmodels.command == "Users")
        {
            db.WorkHours.Add(workhoursmodels);
            db.SaveChanges();
        }
    }

这是我的观点

 @using (Html.BeginForm())
    {
        @Html.AntiForgeryToken()
        @Html.ValidationSummary(true)
        <div class="editor-label">
            @Html.LabelFor(model => model.Users)
        </div>
        <div class="editor-field">
            @Html.TextBoxFor(model => model.Users)
            @Html.ValidationMessageFor(model => model.Users)
        </div>

     <div>
       @Html.DropDownList("WorkStations", String.Empty)
    </div>
              <p>
             <input type="submit" name="@Html.NameFor(x => x.command)" value="User"/>

        </p>

 }

Answer 1

假设您的视图是针对模型WorkhoursModels

的强类型

您不需要viewbag，因为您在模型的属性中定义了IEnumerable，只需更改将模型传递给视图的Action

public ActionResult Create()
{
      WorkhoursModels model = new WorkhoursModels();
      model.Workstations  = db.WorkStation.Select(x => new SelectListItem() { Text = x.WorkStations , Value = x.Id.ToString() });
      return View(model);
}

使用正确的帮助

@Html.DropDownListFor(model => model.Id, Model.Workstations, string.Empty)

mvc 4下拉列表不能正常运行

具有键'WorkStations'的ViewData项的类型为'System.String'，但必须是'IEnumerable'类型。

1 个答案: