使用C#MVC3 HTML.ActionLink中的渲染引导程序下拉菜单

因此,我遇到了MVC ActionLink和bootstrap下拉菜单的问题.我成功进行了简单的菜单扩展,在其中我传递了诸如字符串和一个布尔值之类的参数.但是现在我正在尝试制作自己的扩展程序,该扩展程序可以生成Bootstrap Dropdown并将选定的CSS类添加到下拉列表的父级-“ ONEofTHEdropdownITEMSselected”-当下拉列表中的那些项之一被选中时(选择下拉列表项时,它会路由到另一个控制器前可以是几个或多个控制器)：

<a href="#" class="dropdown-toggle ONEofTHEdropdownITEMSselected" data-toggle="dropdown">Dropdown <b class="caret"></b></a>

和

<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
    <ul class="dropdown-menu">
        <li><a href="~/area/controller1">Action1</a></li>
        <li><a href="~/area/controller2">Action2</a></li>
    </ul>
</li>

以下是我要实现的UI / MenuExtensions.cs-传递两个可以生成引导程序下拉菜单的参数,我可以在该下拉菜单中手动插入新菜单项.

public static class MenuExtensions
    {
        public static MvcHtmlString MenuItem(
            this HtmlHelper htmlHelper,
            string text,
            string action,
            string controller,
            string cssClass = "item",
            bool isController = false
        )
        {
            var li = new TagBuilder("li");
            var routeData = htmlHelper.ViewContext.RouteData;
            var currentAction = routeData.GetRequiredString("action");
            var currentController = routeData.GetRequiredString("controller");

            if ((string.Equals(currentAction, action, StringComparison.OrdinalIgnoreCase) || isController) &&
                 string.Equals(currentController, controller, StringComparison.OrdinalIgnoreCase))
                li.AddCssClass("am-selected");

            li.InnerHtml = htmlHelper.ActionLink(text, action, controller, new { Area = "" }, new { @class = cssClass }).ToHtmlString();
            return MvcHtmlString.Create(li.ToString());
        }

      public static MvcHtmlString SelectMenu(
            this HtmlHelper htmlHelper,
            string cssClass,
            SelectMenuItem[] menuItems
        )
        {
            TagBuilder list = new TagBuilder("li")
            {
                InnerHtml = ""
            };
            string currentAction = htmlHelper.ViewContext.RouteData.GetRequiredString("action");
            string currentController = htmlHelper.ViewContext.RouteData.GetRequiredString("controller");

            foreach (SelectMenuItem menuItem in menuItems)
            {
                TagBuilder li = new TagBuilder("li")
                {
                    InnerHtml = htmlHelper.ActionLink(menuItem.Text, menuItem.Action, menuItem.Controller, null, new { }).ToHtmlString()
                };
                ul.InnerHtml += li.ToString();
            }

            return MvcHtmlString.Create(list.ToString());
        }
    }

这是外部课程

 public class SelectMenuItem
    {
        public string Text { get; set; }
        public string Action { get; set; }
        public string Controller { get; set; }
        public bool IsVisible { get; set; }

        public SelectMenuItem()
        {
            IsVisible = true;
        }
    }

之后,我的html看起来像这样.

 @Html.SelectMenu("dropdown", new []{
                            new SelectMenuItem{ Text = "ViewOne", Controller = "Controller1", Action = "index", IsVisible = SystemUser.Current().IsAdmin},
                            new SelectMenuItem{ Text = "ViewTwo", Controller = "Controller2", Action = "index"}
                        });

问题是SelectMenu仅渲染以下内容：

<li></li>

解决方法:

无需重新发明轮子.使用TwitterBootstrapMVC时,可通过以下语法实现所需的输出：

@using (var dd = Html.Bootstrap().Begin(new DropDown("Dropdown").SetLinksActiveByControllerAndAction()))
{
    @dd.ActionLink("Action1", "index", "controller1")
    @dd.ActionLink("Action2", "index", "controller2")
}

注意扩展方法SetLinksActiveByControllerAndAction().这就是根据当前控制器/操作使链接处于活动状态的原因.

免责声明：我是TwitterBootstrapMVC的作者.

如果使用Bootstrap 3,则需要购买许可证.对于Bootstrap 2,它是免费的.

标签：razor,twitter-bootstrap,asp-net-mvc-routing,c,asp-net-mvc
来源： https://codeday.me/bug/20191030/1966130.html