我正在尝试使用Html。下拉列表扩展方法，但不知道如何与枚举一起使用它。
假设我有一个这样的枚举:
public enum ItemTypes
{
Movie = 1,
Game = 2,
Book = 3
}
我如何去创建一个下拉与这些值使用Html。下拉列表扩展方法?
或者我最好的办法是简单地创建一个for循环并手动创建Html元素?
当前回答
@Html.DropDownListFor(model => model.MaritalStatus, new List<SelectListItem>
{
new SelectListItem { Text = "----Select----", Value = "-1" },
new SelectListItem { Text = "Marrid", Value = "M" },
new SelectListItem { Text = "Single", Value = "S" }
})
其他回答
1-创建ENUM
public enum LicenseType
{
xxx = 1,
yyy = 2
}
2-创建您的服务类别
public class LicenseTypeEnumService
{
public static Dictionary<int, string> GetAll()
{
var licenseTypes = new Dictionary<int, string>();
licenseTypes.Add((int)LicenseType.xxx, "xxx");
licenseTypes.Add((int)LicenseType.yyy, "yyy");
return licenseTypes;
}
public static string GetById(int id)
{
var q = (from p in this.GetAll() where p.Key == id select p).Single();
return q.Value;
}
}
3-在控制器中设置ViewBag
var licenseTypes = LicenseTypeEnumService.GetAll();
ViewBag.LicenseTypes = new SelectList(licenseTypes, "Key", "Value");
绑定你的下拉列表
@Html.DropDownList("LicenseType", (SelectList)ViewBag.LicenseTypes)
这是我的helper方法。 我用这个:
var values = from int e in Enum.GetValues(typeof(TEnum))
select new { ID = e, Name = Enum.GetName(typeof(TEnum), e) };
而不是:
var values = from TEnum e in Enum.GetValues(typeof(TEnum))
select new { ID = (int)Enum.Parse(typeof(TEnum),e.ToString())
, Name = e.ToString() };
下面就是:
public static SelectList ToSelectList<TEnum>(this TEnum self) where TEnum : struct
{
if (!typeof(TEnum).IsEnum)
{
throw new ArgumentException("self must be enum", "self");
}
Type t = typeof(TEnum);
var values = from int e in Enum.GetValues(typeof(TEnum))
select new { ID = e, Name = Enum.GetName(typeof(TEnum), e) };
return new SelectList(values, "ID", "Name", self);
}
我想以一种不同的方式回答这个问题，用户不需要在控制器或Linq表达式中做任何事情。这种方式……
我有一个ENUM
public enum AccessLevelEnum
{
/// <summary>
/// The user cannot access
/// </summary>
[EnumMember, Description("No Access")]
NoAccess = 0x0,
/// <summary>
/// The user can read the entire record in question
/// </summary>
[EnumMember, Description("Read Only")]
ReadOnly = 0x01,
/// <summary>
/// The user can read or write
/// </summary>
[EnumMember, Description("Read / Modify")]
ReadModify = 0x02,
/// <summary>
/// User can create new records, modify and read existing ones
/// </summary>
[EnumMember, Description("Create / Read / Modify")]
CreateReadModify = 0x04,
/// <summary>
/// User can read, write, or delete
/// </summary>
[EnumMember, Description("Create / Read / Modify / Delete")]
CreateReadModifyDelete = 0x08,
/*/// <summary>
/// User can read, write, or delete
/// </summary>
[EnumMember, Description("Create / Read / Modify / Delete / Verify / Edit Capture Value")]
CreateReadModifyDeleteVerify = 0x16*/
}
现在我可以使用这个enum简单地创建一个下拉列表。
@Html.DropDownList("accessLevel",new SelectList(AccessLevelEnum.GetValues(typeof(AccessLevelEnum))),new { @class = "form-control" })
OR
@Html.DropDownListFor(m=>m.accessLevel,new SelectList(AccessLevelEnum.GetValues(typeof(AccessLevelEnum))),new { @class = "form-control" })
如果你想让一个索引被选中，那么试试这个
@Html.DropDownListFor(m=>m.accessLevel,new SelectList(AccessLevelEnum.GetValues(typeof(AccessLevelEnum)) , AccessLevelEnum.NoAccess ),new { @class = "form-control" })
这里我使用了AccessLevelEnum。NoAccess作为默认选择下拉菜单的额外参数。
您希望使用类似Enum的东西。getvalue
@Html.DropDownListFor(model => model.MaritalStatus, new List<SelectListItem>
{
new SelectListItem { Text = "----Select----", Value = "-1" },
new SelectListItem { Text = "Marrid", Value = "M" },
new SelectListItem { Text = "Single", Value = "S" }
})
