Razor CShtml SelectList SelectListItem 默认值不适用

如何解决Razor CShtml SelectList SelectListItem 默认值不适用

我想将 NumOfDays 设置为默认选择“5”。 现在正确显示第 1 到 10 项，但我已添加

selected = (i.ToString() == "5")

和

numOfDays.First(x=>x.Value == "5")

他们中的任何一个都应该帮助我将其设置为自动选择， 但它不起作用，有什么想法吗？

剃须刀页面代码

                <div class="form-group row">
                    <div class="col">
                        <h4 class="modal-title pt-1">Number of days</h4>
                    </div>
                    <div class="col">
                        <div class="form-control-container">
                            @*Html.DropDownListFor(m => m.timetoAction_NumOfDays,Enumerable.Range(1,10).Select(i => new SelectListItem { Text = i.ToString(),Value = i.ToString() }),"5",new { @class = "form-control",@selected = 5})
                            <input type="number" asp-for="timetoAction_NoOfDays" class="form-control" placeholder="Number of Tickets" min="1" max="10" value="5" />*@
                            <select class="form-control" asp-for="timetoAction_NumOfDays" asp-items="Model.NumOfDays">
                            </select>
                        </div>
                    </div>
                </div>

查看模型

public class ReportVm
{
    public DepartmentType? Actioned_DepartmentName { get; set; }
    public DepartmentType? Status_DepartmentName { get; set; }
    public SelectList Departments { get; set; }
    public int timetoAction_NumOfDays { get; set; }
    public SelectList NumOfDays { get; set; }

    public ReportVm()
    {
        Departments = SelectListHelper.GetEnumList<DepartmentType>();
        List<SelectListItem> list = Departments.ToList();
        var all = new SelectListItem() { Value="ALL",Text= "All" };
        list.RemoveAt(0);
        list.Insert(0,all);
        Departments = new SelectList(list,"Value","Text");
        var numOfDays = Enumerable.Range(1,10).Select(i => new SelectListItem
        {
            Text = i.ToString(),Value = i.ToString(),Selected = (i.ToString() == "5")
        });
        NumOfDays = new SelectList(numOfDays,"Text",numOfDays.First(x=>x.Value == "5"));
    }
}