Question

使用Asp.net C＃，MVC3 Razor View，我正在尝试在编辑记录时设置下拉列表值并遵循型号：

public class EditEmployeeModel
    {
        ....
        public int? DepartmentId { get; set; }

        [Required(ErrorMessage = "Department is must")]
        [Display(Name = "Department")]
        public string Department { get; set; }

        public List<SelectListItem> Departments { get; set; }

        .....
}

控制器：

 public ActionResult Edit(string id)
    {
        EditEmployeeModel model = respo.GetEmployeeByID(id);
        model.Departments = GetDepartments();
        return View(model);
    }

观看：

<div class="editor-field">
@Html.DropDownListFor(m => m.DepartmentId, Model.Departments, new { id ="ddlstDepartments"})
@Html.ValidationMessageFor(m => m.Department)
</div>

但是当加载视图进行编辑时，dropdownlist始终显示所选的默认/第一项。有人可以帮忙吗？

Answer 1

在将其传递给视图之前，您是否尝试为列表中的一个元素设置selected = true？

有几个问题，这可能会帮助你喜欢这个：

DropDownList setting selected item in asp.net MVC

Answer 2

确保模型中的DepartmentId

   EditEmployeeModel model = respo.GetEmployeeByID(id);
   //model.DepartmentId

不为空，如果您想将--Select Department--标签显示为@Karthik建议，请尝试

Html.DropDownListFor(m => m.DepartmentId, Model.Departments,"--Select Department")

未使用MVC3 C＃设置下拉列表值

2 个答案: