如何在DropDownListFor的扩展中添加额外的htmlattributes

Question

我正在尝试为以下内容编写扩展名DropDownListFor:

public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, object htmlAttributes, bool enabled)
{
    return htmlHelper.DropDownListFor(expression, selectList, null /* optionLabel */, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}

我想要实现的是如果启用是假的没有改变但是如果启用是真我想@disabled="disabled"在给它们之前添加到html属性AnonymousObjectToHtmlAttributes.

关于如何做到这一点的任何想法？

Answer 1

简单!HtmlHelper.AnonymousObjectToHtmlAttributes回报RouteValueDictionary.您可以为该字典添加值,您不需要向匿名对象添加属性.

public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, object htmlAttributes, bool enabled)
{
    var attrs = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
    if (!enabled)
    {
        attrs.Add("disabled", "disabled");
    }
    return htmlHelper.DropDownListFor(expression, selectList, null /* optionLabel */, attrs);
}