MVC EnumDropDownListFor与Enum Display描述属性作为值

时间:2015-07-20 04:22:52

标签: c# asp.net-mvc razor enums

我有一个带显示描述属性的枚举

public enum CSSColours
    {
        [Display(Description = "bg-green")]
        Green,

        [Display(Description = "bg-blue")]
        Blue,
    }

现在我想将此枚举绑定到DropDownlist,在下拉项目显示文本和描述中显示枚举值(绿色,蓝色)作为项目值(bg-green,bg-blue)。

当我使用EnumDropDownListFor辅助方法

绑定Dropdown时
@Html.EnumDropDownListFor(c => dm.BgColor)

它将项目值设置为枚举值(0,1),并且无法找到将值设置为显示描述的方法。

如何将值设置为Enum Display Description属性?

1 个答案:

答案 0 :(得分:7)

您需要从Enum获取显示名称(DisplayAttribute), 检查下面的示例以设置枚举显示描述属性

的值

动作(绑定下拉列表)

public ActionResult Index()
        {   
            var enumDataColours = from CSSColours e in Enum.GetValues(typeof(CSSColours))
                           select new
                           {
                               ID = StaticHelper.GetDescriptionOfEnum((CSSColours)e),
                               Name = e.ToString()
                           };
            ViewBag.EnumColoursList = new SelectList(enumDataColours, "ID", "Name");
            return View();
        }

Helper方法GetDescriptionOfEnum通过枚举名称获取Description属性

public static class StaticHelper
    {
        public static string GetDescriptionOfEnum(Enum value)
        {
            var type = value.GetType();
            if (!type.IsEnum) throw new ArgumentException(String.Format("Type '{0}' is not Enum", type));

            var members = type.GetMember(value.ToString());
            if (members.Length == 0) throw new ArgumentException(String.Format("Member '{0}' not found in type '{1}'", value, type.Name));

            var member = members[0];
            var attributes = member.GetCustomAttributes(typeof(System.ComponentModel.DataAnnotations.DisplayAttribute), false);
            if (attributes.Length == 0) throw new ArgumentException(String.Format("'{0}.{1}' doesn't have DisplayAttribute", type.Name, value));

            var attribute = (System.ComponentModel.DataAnnotations.DisplayAttribute)attributes[0];
            return attribute.Description;
        }
    }

Razor视图

@Html.DropDownList("EnumDropDownColours", ViewBag.EnumColoursList as SelectList)

枚举

public enum CSSColours
    {
        [Display(Description = "bg-green")]
        Green,

        [Display(Description = "bg-blue")]
        Blue,
    }