将默认值设置为选择列表
本文关键字:选择 列表 设置 默认值 | 更新日期: 2023-09-27 18:22:04
我有这个字符串列表:
public static readonly List<string> LIST_ITEM_STATE = new List<string>
{
"Brand new",
"Never used",
"Slightly used",
"Used",
"Heavily used",
"Damaged",
"Ruined",
"Run for your life"
};
我正在类中以这种方式构建一个选择列表:
public string mItemState { get; set; }
public IEnumerable<SelectListItem> mItemStateList { get; set; }
mItemStateList = new SelectList(ValueDomain.LIST_ITEM_STATE);
而且,在我看来,我将dropdownlistfor渲染成这样:
Item State: @Html.DropDownListFor(_item => _item.mItemState, Model.mItemStateList, String.Empty)
dropdownlist的工作方式很有魅力,但我一直在寻找方法,通过在Brand New
处defaul设置所选值,同时保留String.Emtpty
选项。我怎么能那样做?
我想你必须这样做:
public static readonly List<string> LIST_ITEM_STATE = new List<string>
{
string.Empty,
"Brand new",
"Never used",
"Slightly used",
"Used",
"Heavily used",
"Damaged",
"Ruined",
"Run for your life"
};
并在SelectList
:中设置所选值
mItemStateList = new SelectList(ValueDomain.LIST_ITEM_STATE, "Brand new");
或者确保属性的值设置为您想要的初始值:
_item.mItemState = "Brand new";
这样定义SelectList:
mItemStateList = new SelectList(ValueDomain.LIST_ITEM_STATE, mItemState);