C# 填充MVC Html.DropDownList的问题

我试图用一本字典的内容制作一个下拉列表，如下所示：

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

问题在于标记中，对于采用lambda表达式的DropDownList，没有重载：

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

我尝试使用：

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

但我得到了一个错误：

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

控制器：

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

视图：

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

或者，对于强类型dropdownlist，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.

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; }
}

publicstringvideoprovider{get；set；}//请在此处更正
public IEnumerable Items{get；set；}//如果您使用Viewbag绑定dropdownlist（这是MVC中最简单有效的方法），那么您不需要任何用于下拉的模型属性，您可以删除此属性。

在您的情况下-

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.

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; }
}

视图：

---

编译器错误消息：CS1501:方法“DropDownListFor”没有重载需要1个参数在我将您的anser标记为正确之前，它会将列表中的每个项目显示为[1-Comcast]，等等。如何修改控制器代码以使其仅为Comcast或字典中的任何值？我知道了。我只是设定了它的值。Thanks@user2471435我不明白这个答案。那么，您想返回“Items”属性中的值吗？@user2471435..很抱歉，我今天的互联网连接不好。。只需在model和dropdownlist中查看更新的答案和更正的小问题…model property VideoProvider将在post controller上选择下拉值。。谢谢

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

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