Question

我的选择列表的基础来自枚举（在模型中）：

public enum week : int
{
    Every = 0,
    First = 1,
    Second = 2,
    Third = 3,
    Fourth = 4,
    Last = 5

}

public enum weekday : int
{
    Sunday = 0,
    Monday = 1,
    Tuesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6,
}

我使用ViewBag将这些发送到View，如下面的函数所示（在控制器中）：

     private void PopulateDropDown(object selectedLocation = null, )
        {
            var LocationQuery = from c in db.Location orderby c.name select c;
            ViewBag.LocationSelect = new SelectList(LocationQuery, "LocationID", "name", selectedLocation);

            var statuses = from week w in Enum.GetValues(typeof(week))
                           select new { ID = (int)w, Name= w.ToString() };
            ViewBag.week = new SelectList(statuses, "ID", "Name");
            var weekdayFormat = from weekday s in Enum.GetValues(typeof(weekday))
                           select new { ID = (int)s, Name = s.ToString() };
            ViewBag.weekday = new SelectList(weekdayFormat, "ID", "Name");
        }

对于此示例，您可以忽略LocationQuery（即使它不工作......）

我认为：

@Html.DropDownList("locationID", (SelectList)ViewBag.LocationSelect, "Select a location")

和

         @Html.DropDownList("Week", (SelectList)ViewBag.TypeSelect, "Week")
         @Html.DropDownList("weekday", (SelectList)ViewBag.TypeSelect, "Day")

但是，我发送的数据都不会作为模型的一部分收集：

public class Schedule
{

    public Schedule()
    {
        Times = new List<TimeofDay>();
    }
    public int ScheduleID { get; set; }
    public bool isDisabled { get; set; }
    [DisplayName("For Delivery")]
    public bool isDeliver { get; set; }
    public int Count { get; set; }
    public virtual ICollection<TimeofDay> Times { get; set; }
    public virtual Location Location { get; set; }
    public int Week { get; set; }
    public int weekday { get; set; }
}

渲染时，选择列表看起来像我想要的那样：

         <select id="Week" name="week"><option value="">Week</option>

<option value="0">Every</option>

<option value="1">First</option>

<option value="2">Second</option>

<option value="3">Third</option>

<option value="4">Fourth</option>

<option value="5">Last</option>

</select>

但是，我无法获取POST时发送给控制器的值的数据。按照预期，我无法通过schedule.week获得本周的价值。我是否错过了从选择列表中收集的int值的一个步骤，由枚举运算并存储为int？

（感谢阅读）

安德鲁

Answer 1

我看不到你在哪里设置ViewBag.TypeSelect。

您是否尝试过使用DropDownListFor？

@Html.DropDownListFor(x => x.Week, (SelectList)ViewBag.week, "Week")

修改

另外，你的观点肯定是强类型的吗？你能证明这一点吗？

Answer 2

我认为你的POST动作将Schedule模型作为参数：

[HttpPost]
public ActionResult Foo(Schedule model)
{
    ...
}

现在让我们先来看看第一个下拉列表：

@Html.DropDownList("locationID", (SelectList)ViewBag.LocationSelect, "Select a location")

提交后，它会在POST请求中将其值发送为locationID=123。现在看一下Schedule上没有名为LocationID的属性，所以你没有得到它的价值是完全正常的。您有Location属性，可能属性为LocationID。所以你可以像这样修改下拉列表：

@Html.DropDownList("Location.LocationID", (SelectList)ViewBag.LocationSelect, "Select a location")

现在是枚举类型。当我测试时，他们都为我工作。我能够在Week和weekday属性中的POST操作中获取与下拉列表中所选值相对应的正确整数值。

枚举选择列表ID未使用ASP.NET MVC3分配给SQL

2 个答案: