[ChildActionOnly]
        [AllowAnonymous]
        public ActionResult NavBar()
        {
            NavBarviewmodel viewmodel = new NavBarviewmodel();
            viewmodel.LinkItems = new List<NavBarLinkItem>();

            if (Request.IsAuthenticated)
            {
                SimpleRoleProvider roleProvider = new SimpleRoleProvider();
                if (roleProvider.IsUserInRole(User.Identity.Name,"User"))
                {
                    viewmodel.LinkItems.Add(new NavBarLinkItem() 
                    { Title = "Create Project",Action = "Create",Controller = "Project" });

                }

            }

            viewmodel.LinkItems.Add(new NavBarLinkItem() { Title="Help",Action="Index",Controller="Help" });

            return PartialView("_NavBar",viewmodel);
        }

原来是这样，代码崩溃在“if(roleProvider.IsUserInRole(User.Identity.Name，”User“))”与主题错误消息。所以我进入InitialzeSimpleMembershipAttribute.cs文件，并将这行复制/粘贴到我的函数的顶部：

WebSecurity.InitializeDatabaseConnection("DefaultConnection","UserProfile","UserId","UserName",autoCreateTables: true);

…并收到WebSecurity.InitializeDatabaseConnection只应调用一次的错误消息。这是有道理的，因为在控件定义的顶部有一个应该已经调用了这个函数的属性(看起来好像这样)。所以要安全，我更改以上调用：

if (!WebSecurity.Initialized)
            {
                WebSecurity.InitializeDatabaseConnection("DefaultConnection",autoCreateTables: true);
            }

…并收回原来的错误消息，WebSecurity.InitializeDatabaseConnection应该在blah blah blah之前调用。对这种疯狂的任何洞察将不胜感激