MVC无刷新分页（即局部刷新，带搜索，页数选择，排序功能）

浏览数：49 / 时间：2015年06月09日

　　我查看了很多网站，大部分评论分页都是局部刷新的，可大部分电商商品展示分页都是有刷新页面的，于是我便做了一个商品展示无刷新分页的例子。接下来我就将做一个模仿淘宝已买到的宝贝功能，不过我的是无刷新分页的。

　　至于为何要用无刷新分页（局部刷新）呢，我个人觉得有几点原因：

提高用户体验，无刷新分页网页看起来相对静止，滚轮不会跳到上面，加载速度比较快；
减轻网站服务器压力，返回局部页面（其中无需包含样式和脚本）肯定比返回整个页面要来的轻松；
还有个分页的好处就是减轻数据库的压力，返回几行的数据肯定比返回所有行的数据要轻松啦。

　　首先右击项目-管理NuGet程序包，联机搜索MvcPager,并安装

　　然后在BLL的订单管理OrderManage类里添加一个ToPagedList方法，第几页pageIndex和每页行数pageSize是必需的，其他都可空。

 1         public PagedList<SH_Order> ToPagedList(int pageIndex, int pageSize, string orderBy, string orderName, SH_OrderState? state, SH_PayType? payType, DateTime? startTime, DateTime? endTime, long? accountId)
 2         {
 3             using (var db = new ShopContext())
 4             {
 5                 var log = db.Order.Include(s => s.Account);
 6 
 7                 if (accountId != null)
 8                 {
 9                     log = db.Order.Where(o => o.AccountId == accountId);
10                 }
11 
12                 if (state != null)
13                 {
14                     log = log.Where(o => o.State == state);
15                 }
16 
17                 if (payType != null)
18                 {
19                     log = log.Where(o => o.PayType == payType);
20                 }
21 
22                 if (startTime != null)
23                 {
24                     log = log.Where(o => o.LogTime > startTime);
25                 }
26 
27                 if (endTime != null)
28                 {
29                     log = log.Where(o => o.LogTime < endTime);
30                 }
31 
32                 if (!string.IsNullOrWhiteSpace(orderName))
33                 {
34                     log = log.Where(o => o.OrderName.Contains(orderName));
35                 }
36 
37                 switch (orderBy)
38                 {
39                     case "LogTime":
40                         log = log.OrderBy(o => o.LogTime);
41                         break;
42                     case "LogTime Desc":
43                         log = log.OrderByDescending(o => o.LogTime);
44                         break;
45                     case "AccountName":
46                         log = log.OrderBy(o => o.Account.AccountName);
47                         break;
48                     case "AccountName Desc":
49                         log = log.OrderByDescending(o => o.Account.AccountName);
50                         break;
51                     case "TotalPrice":
52                         log = log.OrderBy(o => o.TotalPrice);
53                         break;
54                     case "TotalPrice Desc":
55                         log = log.OrderByDescending(o => o.TotalPrice);
56                         break;
57                     case "OrderName":
58                         log = log.OrderBy(o => o.OrderName);
59                         break;
60                     case "OrderName Desc":
61                         log = log.OrderByDescending(o => o.OrderName);
62                         break;
63                     case "PayTime":
64                         log = log.OrderBy(o => o.PayTime);
65                         break;
66                     case "PayTime Desc":
67                         log = log.OrderByDescending(o => o.PayTime);
68                         break;
69                     default:
70                         log = log.OrderByDescending(o => o.ID);
71                         break;
72                 }
73 
74                 return log.ToPagedList(pageIndex, pageSize);
75             }
76         }

　　可是只有订单还不行呀，订单是有订单明细的，也就是说除了订单表还有订单明细表，这个不搞出来岂不是做不了淘宝的那个功能？那就再加一个方法：

1         public List<List<SH_OrderDetail>> GetOrderDetailByOrders(PagedList<SH_Order> orders)
2         {
3             using (var db = new ShopContext())
4             {
5                 var details = new List<List<SH_OrderDetail>>();
6                 orders.ForEach(o => details.Add(db.OrderDetail.Include(j => j.Gift).Where(j => j.OrderId == o.ID).ToList()));
7                 return details;
8             }
9         }

　　至此，订单和订单明细都能获取，BLL的逻辑处理已经完成了。接下来就是Web项目的事了。先建一个订单模型：

1     public class OrdersViewModel
2     {
3         public PagedList<SH_Order> Orders { get; set; }
4 
5         public List<List<SH_OrderDetail>> OrderDetails { get; set; }
6     }

　　这个模型用来存放从BLL获取的订单和订单明细，然后就处理Controller了：

        [ShopAuthorize]
        public ActionResult OrderList(string orderState, string orderBy, string payType, string logTime, string orderName, string giftName, int pageSize = 10, int pageIndex = 1)
        {
            DateTime? startTime = null;
            DateTime? endTime = null;

            switch (logTime)
            {
                case "1MonthAgo":
                    endTime = DateTime.Now.AddMonths(-1);
                    break;
                default:
                    startTime = DateTime.Now.AddMonths(-1);
                    break;
            }

            SH_OrderState enumOrderState;
            var result = Enum.TryParse(orderState, out enumOrderState);
            SH_OrderState? endOrderState = null;
            if (result) endOrderState = enumOrderState;

            SH_PayType enumPayType;
            result = Enum.TryParse(payType, out enumPayType);
            SH_PayType? endPayType = null;
            if (result) endPayType = enumPayType;

            var manage = new OrderManage();
            var orders = manage.ToPagedList(pageIndex, pageSize, orderBy, orderName, endOrderState, endPayType, startTime, endTime, long.Parse(User.Identity.GetUserId()));
            var orderList = new OrdersViewModel
            {
                Orders = orders,
                OrderDetails = manage.GetOrderDetailByOrders(orders)
            };

            if (Request.IsAjaxRequest())
            {
                return PartialView("_OrderList", orderList);
            }

            ViewBag.OrderState = Common.Common.GetSelectListByEnum(typeof(SH_OrderState), "全部订单状态");
            ViewBag.PayType = Common.Common.GetSelectListByEnum(typeof(SH_PayType), "全部支付方式");
            ViewData["GiftLevel"] = Common.Common.GetSelectListByEnum(typeof(SH_GiftLevel));
            return View("OrderManage", orderList);
        }

　　其中ShopAuthorize是我自定义的登录验证：

 1     public class ShopAuthorizeAttribute : AuthorizeAttribute
 2     {
 3         protected override bool AuthorizeCore(HttpContextBase httpContext)
 4         {
 5             var user = httpContext.User;
 6             return user != null && user.IsInRole("Account");
 7         }
 8         
 9         protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
10         {
11             if (filterContext == null)
12             {
13                 return;
14             }
15 
16             var path = filterContext.HttpContext.Request.Path;
17             const string strUrl = "/Account/Login?returnUrl={0}";
18             filterContext.HttpContext.Response.Redirect(string.Format(strUrl, HttpUtility.UrlEncode(path)), true);
19         }
20     }