菜单加载学习1

https://blog.csdn.net/zhuyu19911016520/article/details/52573072

        /// <summary>
        /// 获取当前用户的角色菜单信息
        /// </summary>
        /// <returns></returns>
        string GetRoleMenu()
        {
            var userId = CurrentUser.Id;
            var roleService = ServiceHelper.Create<IRoleService>();
            var roleMenus = roleService.GetRoleMenuByUserId(userId);//获取用户角色权限菜单
            var allMenus = initGlobalData.Menus;                    //获取缓存中的所有菜单

            //关联得到所有角色权限菜单 --最多展现3级菜单
            var menus = allMenus.Join(roleMenus, a => a.Id, b => b.MenuId, (a, b) => new
            {
                Id = a.Id,
                MenuName = a.MenuName,
                MenuIcon = a.MenuIcon,
                LinkUrl = a.LinkUrl,
                ParentId = a.ParentId,
                FullPath = a.FullPath,
                State = a.State,
                SortIndex = a.SortIndex,
                level = a.level
            }).OrderBy(item => item.SortIndex);

            StringBuilder sb = new StringBuilder();
            var menus0 = menus.Where(item => item.level == 0).ToArray();
            foreach (var menu in menus0)                    //一级菜单
            {
                var menus1 = menus.Where(item => item.ParentId == menu.Id && item.level == 1).ToArray();
                sb.AppendLine("<li>");
                sb.AppendLine("<a href="javascript:void(0)"><i class="" + menu.MenuIcon + ""></i><span>" + menu.MenuName + "</span><b class="icon-keyboard_arrow_left"></b></a>");
                sb.AppendLine("<ul class="ms_fs2_menu">");
                foreach (var menu1 in menus1)               //二级菜单
                {
                    var menus2 = menus.Where(item => item.ParentId == menu1.Id && item.level == 2).ToArray();
                    sb.AppendLine("<li>");
                    if (menus2.Count() > 0)
                        sb.AppendLine("<a href="javascript:void(0)">");
                    else
                        sb.AppendLine("<a href="" + menu1.LinkUrl + "" target="rightFrame">");

                    sb.AppendLine("<i class="" + menu1.MenuIcon + ""></i><span>" + menu1.MenuName + "</span>");
                    if (menus2.Count() > 0)
                        sb.AppendLine("<b class="icon-keyboard_arrow_left"></b>");

                    sb.AppendLine("</a>");
                    if (menus2.Count() > 0)                 //三级菜单
                    {
                        sb.AppendLine("<ul class="ms_fs3_menu">");
                        foreach (var menu2 in menus2)
                        {
                            sb.AppendLine("<li><a href="" + menu2.LinkUrl + "" target="rightFrame"><i class="" + menu2.MenuIcon + ""></i><span>" + menu2.MenuName + "</span></a></li>");
                        }
                        sb.AppendLine("</ul>");
                    }
                    sb.AppendLine("</li>");
                }
                sb.AppendLine("</ul>");
                sb.AppendLine("</li>");
            }
            return sb.ToString();
        }