带有自定义属性的DropDownListFor，属性名称中包含“-”？

Question

问题：我需要创建一个下拉列表，就像这样：

<select id="ddCustomers" data-placeholder="Choose a customer" class="chzn-select" style="width:350px;" tabindex="1" multiple>

现在我可以像这样添加自定义属性：

@Html.DropDownListFor(m => m.Id, Model.Values, new { @disabled = "disabled" })

很遗憾，如果变量名中有“-”，则无法编译。

@Html.DropDownListFor(m => m.Id, Model.Values, new { @disabled = "disabled", @data-placeholder = "whatever" })

那么对于没有属性值的多个属性呢？

如果我传递一个字典或者NameValueCollection而不是new { @disabled = "disabled" }，那么它会输出NameValueColletion/Dictionary的属性...

如何传递带有特殊字符的属性键？

- Stefan Steiger

---

可能是使用ASP.NET MVC的连字符HTML属性的重复问题。 - ED-209

Answer 1

使用下划线代替

@data_placeholder = "whatever"

自从Mvc3以来，在呈现时使用“-”代替“_”。这也适用于Mvc5。

这很好地起到作用，因为在html属性名称中不允许使用下划线。

- dove

Answer 2

啊，这很简单。
错误在于声明了一个<string, string>的字典，而不是<string, object>的字典（还有在cOption中使用变量而不是属性）...
使用<string, string>的字典时，它使用了对象“paramlist”重载，而不是IDictionary<string, object> ;)

@Html.DropDownListFor(model => model.Title, new SelectList(Model.ls, "value", "text"), Model.nvc)

 <!--
 @Html.DropDownList("myIdAndName", new SelectList(Model.ls, "value", "text"), Model.nvc)
 -->




    public ActionResult Index()
    {
        cHomeModel HomeModel = new cHomeModel();

        HomeModel.nvc.Add("class", "chzn-select");
        HomeModel.nvc.Add("data-placeholder", "Choose a customer");
        HomeModel.nvc.Add("style", "width:350px;");
        HomeModel.nvc.Add("tabindex", "1");
        HomeModel.nvc.Add("multiple", "multiple");
        HomeModel.nvc.Add("id", "lol");


        cOption option = null;


        for (int i = 0; i < 10; ++i)
        {
            option = new cOption();

            option.value = i.ToString();
            option.text = "text" + i.ToString();

            HomeModel.ls.Add(option);
        }


        return View(HomeModel);
    }





    public class cOption
    {
        public string value
        {
            get;
            set;
        }

        public string text
        {
            get;
            set;
        }

    }


    public class cHomeModel
    {
        public string Title = "MyDropDownListName";
        public List<cOption> ls = new List<cOption>();


        public System.Collections.Generic.Dictionary<string, object> nvc = new System.Collections.Generic.Dictionary<string, object>();

    }

更多关于Linqiq的内容：

public ActionResult Index()
{
    cHomeModel HomeModel = new cHomeModel();

    HomeModel.nvc.Add("class", "chzn-select");
    HomeModel.nvc.Add("data-placeholder", "Choose a customer");
    HomeModel.nvc.Add("style", "width:350px;");
    HomeModel.nvc.Add("tabindex", "1");
    HomeModel.nvc.Add("multiple", "multiple");
    HomeModel.nvc.Add("id", "lol");


    HomeModel.ls = System.Linq.Enumerable.Range(0, 9)
            .Select(x => new cOption() { text = x.ToString(), value = x.ToString() })
            .ToList();


    // or otherwise: 
    HomeModel.ls = (
                 from i in System.Linq.Enumerable.Range(0, 9)
                 select new cOption() { text = i.ToString(), value = i.ToString() }
    ).ToList();


    return View(HomeModel);
}

- Stefan Steiger