c# - ASP.NET MVC 在哪里保存 SelectLists 的值

Question

我目前在我的 ViewModels 的顶部遇到了所有这些困惑，我觉得这违反了 DTO 的目的。例如，这是在我的一个 View 模型的构造函数中 -

        Dictionary<int, string> chargeGroups = new Dictionary<int, string>();
        chargeGroups.Add(1, "Administration");
        chargeGroups.Add(2, "Annual Leave");
        chargeGroups.Add(3, "Bereavement");
        chargeGroups.Add(4, "Customer Installation, Setup & Training");
        chargeGroups.Add(5, "Customer Support");
        chargeGroups.Add(6, "Internal Training & Education");
        chargeGroups.Add(7, "Sales & Marketing");
        chargeGroups.Add(8, "Sick");
        chargeGroups.Add(9, "Software Devel / Maint / Test");
        chargeGroups.Add(10, "Software Upgrade / Patch");
        chargeGroups.Add(11, "Other");
        chargeGroups.Add(12, "Other Absence");
        chargeGroups.Add(13, "Warranty");
        chargeGroups.Add(14, "Public Holiday");
        chargeGroups.Add(15, "Other Paid Leave");

        ChargeGroups = new SelectList(chargeGroups, "Key", "Value");

我的 View 模型:

    [DisplayName("Charge group")]
    public short? ChargeGroup { get; set; }

    public SelectList ChargeGroups;

然后在我看来:

            <div class="editor-label">
                @Html.LabelFor(model => model.ChargeGroup)
            </div>
            <div class="editor-field">
                @Html.DropDownListFor(model => model.ChargeGroup, Model.ChargeGroups)
                @Html.ValidationMessageFor(model => model.ChargeGroup)
            </div>

我应该把这些东西放在哪里？

Answer 1

当我有一个不会改变的值列表时，我通常使用一个枚举，然后使用一个自定义的 Html Helper 来呈现一个选择列表。您可以使用元数据描述标记自定义枚举值的显示文本。

这样你就可以使用:

 <%: Html.EnumDropDownListFor(model => model.EnuProperty) %>

或

 @Html.EnumDropDownListFor(model => model.EnuProperty)

查看 Simon 的这篇文章，它允许您使用元描述属性来自定义枚举名称的输出:

How do you create a dropdownlist from an enum in ASP.NET MVC?

这是另一个示例，但它缺少元描述属性:

http://blogs.msdn.com/b/stuartleeks/archive/2010/05/21/asp-net-mvc-creating-a-dropdownlist-helper-for-enums.aspx

编辑

你的枚举可能看起来像这样

 public enum ChargeGroupEnum
 {
    [Description("Administration")]
    Administration=1,
    [Description("Annual Leave")]
    AnnualLeave=2,
    [Description("Bereavement")]
    Bereavement=3,
    [Description("Customer Installation, Setup & Training")]
    CustomerInstallation=4,
    [Description("Customer Support")]
    CustomerSupport=5,
    [Description("Internal Training & Education")]
    InternalTraining=6,
    [Description("Sales & Marketing")]
    SalesMarketing=7,
    [Description("Sick")]
    Sick=8,
    [Description("Software Devel / Maint / Test")]
    Development=9,
    [Description("Software Upgrade / Patch")]
    Upgrade=10,
    [Description("Other")]
    Other=11,
    [Description("Other Absence")]
    OtherAbsence=12,
    [Description("Warranty")]
    Warranty=13,
    [Description("Public Holiday")]
    PublicHoliday=14,
    [Description(")ther Paid Leave")]
    OtherPaidLeave=15
}

然后在您的 View Model 上，您可以使用以下内容使该字段以无值开头并需要一个值:

 [Required(ErrorMessage=" * required")]
 public ChargeGroupEnum? ChargeGroup {get;set;}

然后在您看来，您将使用 Html Helper“ChargeGroupEnum”，您需要从我链接到的帖子中获取它。

 @Html.EnumDropDownListFor(model => Model.ChargeGroup) 

如果您的模型有一个 Int，您可以轻松地从 Enum => Int 和 Int => Enum 转换。