Question

我正在尝试使用类似这样的字典内容来填充DropDownList：

public static readonly IDictionary<string, string> VideoProviderDictionary = new Dictionary<string, string>
                {
                {"1", "Atlantic"},
                {"2", "Blue Ridge"},
                ...

对于我的模型：

public string[] VideoProvider { get; set; }
            public IEnumerable<SelectListItem> Items { get; set; }

在控制器中，我试图填充列表：

 [HttpGet]
       public ActionResult Register()
       {
            var model = new RegisterViewModel();
            model.Items = new SelectList(VideoProviders.VideoProviderDictionary);

           return View(model);
       }

问题在于标记，DropDownList没有带有lambda表达式的重载：

 @Html.DropDownList(Model -> model.Items)

我试图使用：

 @Html.DropDownListFor(model => model.Items)

但我收到错误：

CS1501: No overload for method 'DropDownListFor' takes 1 arguments

Answer 1

在你的情况下 -

型号：

public class RegisterViewModel
{

    public static readonly IDictionary<string, string> VideoProviderDictionary = new Dictionary<string, string>
            {{"1", "Atlantic"},
            {"2", "Blue Ridge"}};

    public string VideoProvider { get; set; }
    public IEnumerable<SelectListItem> Items { get; set; }
}

控制器：

    [HttpGet]
    public ActionResult Register() {
        var model = new RegisterViewModel();
        model.Items = new SelectList(RegisterViewModel.VideoProviderDictionary, "key", "value");
        return View(model);
    }

查看：

    @Html.DropDownListFor(model => model.VideoProvider, Model.Items)

Answer 2

控制器：

[HttpGet]
   public ActionResult Register()
   {
        var model = new RegisterViewModel();
        Viewbag.Items = new SelectList(VideoProviders.VideoProviderDictionary);
        ......
        ......
        return View(model);
   }

查看：

@Html.DropDownList("VideoProvider",Viewbag.Items as SelectList)

或者对于强类型下拉列表，请执行以下操作：

@Html.DropDownListFor(model=>model.VideoProvider,Viewbag.Items as SelectList)

型号：

public string VideoProvider { get; set; }   //Correct here
public IEnumerable<SelectListItem> Items { get; set; }  //if you are using Viewbag to bind dropdownlist(which is a easiest and effective way in MVC) then you don't need any model property for dropdown,you can remove this property.

填充MVC Html.DropDownList的问题

2 个答案: