代码没有变化，如下所示。将引导程序从 3.2 升级到 4.3.1。现在，菜单- 在左侧显示为一条线- 无论窗口大小如何，汉堡菜单都不会显示- 与汉堡菜单类似地展开和折叠我已将 navbar-inverse 更新为 navbar-dark，但找不到任何其他更改。折叠 展开升级前请修正@using Portal.Helpers;<!DOCTYPE html><html><head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Center For People In Need @ViewBag.Title</title> @Styles.Render("~/Content/css") @RenderSection("styles", required: false)</head><body> <div class="navbar navbar-dark bg-dark navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a href="@Url.Action(" Index", "Home" )"><img src="/Content/Logo.png" alt="l" class="logo" /></a> @*<a href="@Url.Action("Index", "Home")"><img src="/Content/Logo.png" alt="logo" class="logo" /></a>*@ </div> <div class="navbar-collapse collapse"> <ul class="nav navbar-nav"> @{var UserRoles = Roles.GetRolesForUser();} @if (UserRoles.Contains("ClientUser") || UserRoles.Contains("ClientAdmin")) { <li class="@Html.SelectedClass(TempData["activemenu"], "Clients")"> @Html.ActionLink("Clients", "Index", "Clients") </li> }...
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