c# - 为什么我的 DropDownList 中出现 "System.Web.Mvc.SelectListItem"？

Question

我相信我已经正确绑定(bind)了我的数据，但我似乎无法让每个 SelectListItem 的文本属性正确显示。

我的模型:

public class Licenses
    {
        public SelectList LicenseNames { get; set; }
        public string SelectedLicenseName { get; set; }
    }

Controller :

[HttpGet]
    public ActionResult License()
    {
        try
        {
            DataTable LicsTable = BW.SQLServer.Table("GetLicenses", ConfigurationManager.ConnectionStrings["ProfressionalActivitiesConnection"].ToString());
            ProfessionalActivities.Models.Licenses model = new ProfessionalActivities.Models.Licenses();
            model.LicenseNames = new SelectList(LicsTable.AsEnumerable().Select(row =>
            new SelectListItem
            {
                Value = row["Description"].ToString(),
                Text = "test"
            }));
            return PartialView("_AddLicense", model);
        }
        catch (Exception ex)
        {
            var t = ex;
            return PartialView("_AddLicense");
        }
    }

查看:

@Html.DropDownList("LicenseNames", new SelectList(Model.LicenseNames, "Value", "Text", Model.LicenseNames.SelectedValue), new { htmlAttributes = new { @class = "form-control focusMe" } })

Answer 1

使用类型为 SelectList 的 LicenseNames 属性的 Items 属性

@Html.DropDownList("SelectedLicenseName", new SelectList(Model.LicenseNames.Items,
                                       "Value", "Text", Model.LicenseNames.SelectedValue))

或者使用 DropDownListFor 辅助方法

@Html.DropDownListFor(d=>d.SelectedLicenseName, 
                                         Model.LicenseNames.Items as List<SelectListItem>)

因此，当您发布表单时，您可以检查 SelectedLicenseName 属性

[HttpPost]
public ActionResult Create(Licenses model)
{
  //check model.SelectedLicenseName
}