c# - 将默认值设置为选择列表

Question

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，我会像这样呈现下拉列表:

Item State: @Html.DropDownListFor(_item => _item.mItemState, Model.mItemStateList, String.Empty)

下拉列表就像一个魅力，但我一直在寻找在 Brand New 默认情况下设置所选值的方法，同时保留 String.Emtpty 选项。我怎么能那样做？

Answer 1

我认为你必须这样做:

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中设置选中的值:

 mItemStateList = new SelectList(ValueDomain.LIST_ITEM_STATE, "Brand new");

或者确保属性的值设置为你想要的初始值:

_item.mItemState = "Brand new";