前幾天做一個(gè)小小小項(xiàng)目，使用了MVC+Bootstrap，以前做分頁都是異步加載Mvc部分視圖的方式，因?yàn)檫@個(gè)是小項(xiàng)目，就隨便一點(diǎn)。一般的列表頁面，少不了有查詢條件，下面分享下Drapper+PagedList.Mvc支持多查詢條件分頁的使用經(jīng)驗(yàn)。

在MVC中我們一般習(xí)慣使用強(qiáng)類型Model，通過分析Orders的展示頁面，來構(gòu)建這個(gè)Model。

1.查詢參數(shù)的Model

public class OrderQueryParamModel  {    /// <summary>    /// 訂單編號(hào)    /// </summary>    public string OrderNo { get; set; }    /// <summary>    /// 客戶名稱    /// </summary>    public string CustomerName { get; set; }  }

2.Orders分頁數(shù)據(jù)Model

PagedList提供了一個(gè)StaticPagedList<T>泛型類來封裝數(shù)據(jù)。（看看StaticPagedList的源代碼，使用非常方便，把T類型的數(shù)據(jù)subset，pageNumber，pageSize，totalCount初始化進(jìn)去就可以了。
）

public StaticPagedList(IEnumerable<T> subset, IPagedList metaData) : this(subset, metaData.PageNumber, metaData.PageSize, metaData.TotalItemCount)    {    }

3.Orders展示頁面整體Model

public class OrderViewModel  {    public OrderQueryParamModel QueryModel { get; set; }    public PagedList.StaticPagedList<OrderModel> OrderList { get; set; }   }

OK，接下來看看在Controller中如何給來OrderViewModel填充數(shù)據(jù)吧

 public ActionResult List(OrderViewModel orderViewModel, int page = 1)    {      var pagesize = 10;      var count = 0;      var orders = _orderService.GetOrders(page, pagesize, model.QueryModel, ref count);      orderViewModel.OrderList = new StaticPagedList<OrderModel>(orders, page, pagesize, count);      return View(orderViewModel);    }

Controller中代碼很簡(jiǎn)單，接收POST過來的兩個(gè)參數(shù)，orderViewModel：包含查詢參數(shù)Model，page：PagedList定義的當(dāng)前頁。

順便看看GetOrders()這個(gè)方法吧，為了省事懶得寫存儲(chǔ)過程，直接用了Drapper的QueryMultiple，感覺很強(qiáng)大啊。

 public List<OrderModel> GetOrders(int pageindex, int pagesize, OrderQueryParamModel query, ref int count)    {      var orders = new List<OrderModel>();      var whereStr = string.Empty;      if (query != null)      {        if (!string.IsNullOrEmpty(query.CustomerName))        {          whereStr += string.Format(" and CustomerName like '%{0}%' ", query.CustomerName);        }      }      var cmd = string.Format(@"SELECT COUNT(*) FROM [Orders] WHERE 1=1 {0};            SELECT * FROM (            SELECT *, row_number() OVER (ORDER BY orderId DESC ) AS [row]                  FROM [Orders] WHERE 1=1 {0} )t            WHERE t.row >@indexMin AND t.row<=@indexMax", whereStr);      using (IDbConnection conn = BaseDBHelper.GetConn())      {        using (var multi = conn.QueryMultiple(cmd,           new { indexMin = (pageindex - 1) * pagesize, indexMax = pageindex * pagesize }))        {          count = multi.Read<int>().SingleOrDefault();          orders = multi.Read<OrderModel>().ToList();        }      }      return orders;    }