.NET MVC 5.2.3：如何创造出SelectListItem的禁用选项？

问题描述

我想创建禁用，以便它们是不可选择的几个选项的下拉列表。这里是我的code：

I am trying to create a dropdown list with a few options disabled so that they are not selectable. Here is my code:

var places = new SelectList(new List<SelectListItem>
{
    new SelectListItem { Selected = false, Text = "Virgin Islands", Value = "Virgin Islands"},
    new SelectListItem { Selected = false, Text = "", Value = "", Disabled= true},
    new SelectListItem { Selected = false, Text = "Canada", Value = "Canada", Disabled= true},
    new SelectListItem { Selected = false, Text = "", Value = "", Disabled= true},
    new SelectListItem { Selected = false, Text = "Other", Value = "Other"},
}, "Value", "Text");

不过，生成的HTML残疾人SelectListItem仅仅是：

However, generated HTML for the disabled SelectListItem is merely:

<option value=""></option>

我怎样才能生成下面的HTML

How can I generate the following HTML

<option disabled="disabled"></option>

从SelectListItem？

from SelectListItem?

谢谢！

推荐答案

的禁用属性将只有当你用尊敬的的IEnumerable＆LT; SelectListItem＆GT; ，而不是的SelectList （在的SelectList 构造器，你只设置的属性值和文本），并在任何情况下，很少有一点创建的IEnumerable＆LT; SelectListItem＆GT; 然后创建的SelectList 从它当帮手只接受的IEnumerable＆LT; SelectListItem＆GT;

The Disabled property will only be respected if you use IEnumerable<SelectListItem>, not SelectList (in the SelectList contructor, you are only setting the properties of Value and Text) and in any case there is little point creating IEnumerable<SelectListItem> then creating SelectList from it when the helper only accepts IEnumerable<SelectListItem>

var places = new List<SelectListItem>
{
    new SelectListItem { Selected = false, Text = "Virgin Islands", Value = "Virgin Islands"},
    new SelectListItem { Selected = false, Text = "", Value = "", Disabled= true},
    ....
};

然后在助手

@Html.DropDownList(m => m.YourProperty, model.places) // or (IEnumerable<SelectListItem>)ViewBag.places

边注：的SelectList 确实有一个重载的构造函数的IEnumerable disabledValues​​ 作为参数（的）

Side note: SelectList does have an overloaded constructor that takes IEnumerable disabledValues as a parameter (refer documentation)

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