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Mvc Linq 分页 参考PagedList
第一次写博客 写的不好各位大神多多包涵。
我的分页主要是针对Linq 分页来写的，针对IEnumerable<T> 和 IQueryable<T> 类型数据分页。 开始上代码
创建接口：
public interface IPagedList { /// <summary> /// 总记录数 /// </summary> int TotalCount { get; set; } /// <summary> /// 总页数 /// </summary> int TotalPages { get; set; } /// <summary> /// 当前页 /// </summary> int PageIndex { get; set; } /// <summary> /// 页面大小 /// </summary> int PageSize { get; set; } /// <summary> /// 是否上一页 /// </summary> bool IsPreviousPage { get; } /// <summary> /// 是否下一页 /// </summary> bool IsNextPage { get; } }
泛型实体类：PagedQueryableToListModel<T>（实现IQueryable集合的数据），PagedCacheToListModel<T> （实现List集合的数据）我在这里重载构造函数实现根据参数不同调用不同构造函数 代码如下：
1 //PagedQueryableToListModel<T>泛型类 2 public class PagedQueryableToListModel<T> : List<T>,IPagedList 3 { 4 /// <summary> 5 /// 数据源为IQueryable的范型 6 /// </summary> 7 /// <param name="source">数据源</param> 8 /// <param name="index">当前页</param> 9 /// <param name="pageSize">页大小</param> 10 public PagedQueryableToListModel(IQueryable<T> source, int index, int pageSize) 11 { 12 //判断传过来的实体集是否为空 13 if(source != null) 14 { 15 int total = source.Count(); 16 this.TotalCount = total; 17 this.PageSize = pageSize; 18 this.TotalPages = total / pageSize; 19 if (total % pageSize > 0) 20 TotalPages++; 21 this.PageSize = PageSize; 22 if (index > this.TotalPages) 23 { 24 index = this.TotalPages; 25 } 26 if (index < 1) 27 { 28 index = 1; 29 } 30 this.PageIndex = index; 31 List<T> resultSet = source.Skip((PageIndex-1) * PageSize).Take(PageSize).ToList(); 32 this.AddRange(resultSet);//Skip跳过指定条数，Take返回多少条 33 } 34 } 35 36 /// <summary> 37 /// 数据源为IQueryable的范型 38 /// </summary> 39 /// <param name="source">数据源</param> 40 /// <param name="index">当前页</param> 41 /// <param name="pageSize">页大小</param> 42 public PagedQueryableToListModel(IQueryable<T> source, int index, int pageSize, out int totalCount) 43 { 44 //判断传过来的实体集是否为空 45 if (source != null) 46 { 47 totalCount = source.Count(); 48 this.TotalCount = totalCount; 49 this.PageSize = pageSize; 50 this.TotalPages = totalCount / pageSize; 51 if (totalCount % pageSize > 0) 52 TotalPages++; 53 this.PageSize = PageSize; 54 if (index > this.TotalPages) 55 { 56 index = this.TotalPages; 57 } 58 if (index < 1) 59 { 60 index = 1; 61 } 62 this.PageIndex = index; 63 List<T> resultSet = source.Skip((PageIndex - 1) * PageSize).Take(PageSize).ToList(); 64 this.AddRange(resultSet);//Skip跳过指定条数，Take返回多少条 65 } 66 else 67 { 68 totalCount = 0; 69 } 70 } 71 72 /// <summary> 73 /// 总记录数 74 /// </summary> 75 public int TotalCount { get; set; } 76 /// <summary> 77 /// 总页数 78 /// </summary> 79 public int TotalPages { get; set; } 80 /// <summary> 81 /// 当前页 82 /// </summary> 83 public int PageIndex { get; set; } 84 /// <summary> 85 /// 页面大小 86 /// </summary> 87 public int PageSize { get; set; } 88 /// <summary> 89 /// 是否上一页 90 /// </summary> 91 public bool IsPreviousPage 92 { 93 get 94 { 95 return PageIndex-1 > 0; 96 } 97 } 98 /// <summary> 99 /// 是否下一页100 /// </summary>101 public bool IsNextPage102 {103 get104 {105 return (PageIndex * PageSize) < TotalCount;106 }107 }108 109 110 }
1 // PagedCacheToListModel<T>泛型类 2 public class PagedCacheToListModel<T> : List<T>, IPagedList 3 { 4 /// <summary> 5 /// 数据源为List的范型 6 /// </summary> 7 /// <param name="source">数据源</param> 8 /// <param name="index">当前页</param> 9 /// <param name="pageSize">页大小</param> 10 public PagedCacheToListModel(List<T> source, int index, int pageSize) 11 { 12 //判断传过来的实体集是否为空 13 if(source != null) 14 { 15 int total = source.Count; 16 this.TotalCount = total; 17 this.PageSize = pageSize; 18 this.TotalPages = total / pageSize; 19 if (total % pageSize > 0) 20 TotalPages++; 21 this.PageSize = PageSize; 22 if (index > this.TotalPages) 23 { 24 index = this.TotalPages; 25 } 26 if (index < 1) 27 { 28 index = 1; 29 } 30 this.PageIndex = index; 31 List<T> resultSet = source.Skip((PageIndex-1) * PageSize).Take(PageSize).ToList(); 32 this.AddRange(resultSet);//Skip跳过指定条数，Take返回多少条 33 } 34 } 35 36 /// <summary> 37 /// 数据源为List集合数据 38 /// </summary> 39 /// <param name="source">数据源</param> 40 /// <param name="index">当前页</param> 41 /// <param name="pageSize">页大小</param> 42 public PagedCacheToListModel(List<T> source, int index, int pageSize, out int totalCount) 43 { 44 //判断传过来的实体集是否为空 45 if (source != null) 46 { 47 totalCount = source.Count; 48 this.TotalCount = totalCount; 49 this.PageSize = pageSize; 50 this.TotalPages = totalCount / pageSize; 51 if (totalCount % pageSize > 0) 52 TotalPages++; 53 this.PageSize = PageSize; 54 if (index > this.TotalPages) 55 { 56 index = this.TotalPages; 57 } 58 if (index < 1) 59 { 60 index = 1; 61 } 62 this.PageIndex = index; 63 List<T> resultSet = source.Skip((PageIndex - 1) * PageSize).Take(PageSize).ToList(); 64 this.AddRange(resultSet);//Skip跳过指定条数，Take返回多少条 65 } 66 else 67 { 68 totalCount = 0; 69 } 70 71 } 72 73 /// <summary> 74 /// 总记录数 75 /// </summary> 76 public int TotalCount { get; set; } 77 /// <summary> 78 /// 总页数 79 /// </summary> 80 public int TotalPages { get; set; } 81 /// <summary> 82 /// 当前页 83 /// </summary> 84 public int PageIndex { get; set; } 85 /// <summary> 86 /// 页面大小 87 /// </summary> 88 public int PageSize { get; set; } 89 /// <summary> 90 /// 是否上一页 91 /// </summary> 92 public bool IsPreviousPage 93 { 94 get 95 { 96 return PageIndex-1 > 0; 97 } 98 } 99 /// <summary>100 /// 是否下一页101 /// </summary>102 public bool IsNextPage103 {104 get105 {106 return (PageIndex * PageSize) < TotalCount;107 }108 }109 110 }
构建泛型方法调用分页实体类
1 public static class ExtendPagedList 2 { 3 4 /// <summary> 5 /// static方法 传递linq返回分页数据 6 /// </summary> 7 /// <typeparam name="T">IQueryable集合</typeparam> 8 /// <param name="linq">数据源</param> 9 /// <param name="pageIndex">当前页</param>10 /// <param name="pageSize">页面大小</param>11 /// <returns></returns>12 public static PagedQueryableToListModel<T> ToPagedList<T>(this IQueryable<T> linq, int pageIndex, int pageSize)13 {14 return new PagedQueryableToListModel<T>(linq, pageIndex, pageSize);15 }16 17 /// <summary>18 /// static方法 传递linq返回分页数据 及 数据总数19 /// </summary>20 /// <typeparam name="T">IQueryable集合</typeparam>21 /// <param name="linq"></param>22 /// <param name="pageIndex"></param>23 /// <param name="pageSize"></param>24 /// <param name="totalCount">返回数据总数</param>25 /// <returns></returns>26 public static PagedQueryableToListModel<T> ToPagedList<T>(this IQueryable<T> linq, int pageIndex, int pageSize, out int totalCount)27 {28 return new PagedQueryableToListModel<T>(linq, pageIndex, pageSize, out totalCount);29 }30 /// <summary>31 /// 返回List集合分页数据32 /// </summary>33 /// <typeparam name="T">List集合</typeparam>34 /// <param name="list"></param>35 /// <param name="pageIndex"></param>36 /// <param name="pageSize"></param>37 /// <returns></returns>38 public static PagedCacheToListModel<T> PagedCacheToList<T>(this List<T> list, int pageIndex, int pageSize)39 {40 return new PagedCacheToListModel<T>(list, pageIndex, pageSize);41 }42 /// <summary>43 /// 返回List集合分页数据 及 数据总数44 /// </summary>45 /// <typeparam name="T">List集合</typeparam>46 /// <param name="list"></param>47 /// <param name="pageIndex"></param>48 /// <param name="pageSize"></param>49 /// <param name="totalCount">返回总数</param>50 /// <returns></returns>51 public static PagedCacheToListModel<T> PagedCacheToList<T>(this List<T> list, int pageIndex, int pageSize, out int totalCount)52 {53 return new PagedCacheToListModel<T>(list, pageIndex, pageSize, out totalCount);54 }55 }
之后是Controller中ActionResult方法返回数据
1 public ActionResult Index(int indexPage=1, int pageSize=5) 2 { 3 XiaoMiViewModel miView = new XiaoMiViewModel(); 4 using(XiaoMiEntities db =new XiaoMiEntities()) 5 { 6 //IQueryable集合 7 var xiaomiSet1 = (from i in db.xiaomi 8 orderby i.id 9 select new XiaoMiModel10 {11 id = i.id,12 username = i.username,13 email = i.email14 }).AsQueryable();15 16 int totalCount = default(int);//总数17 //此处为IQueryable集合18 miView.PageData = http://www.mamicode.com/ExtendPagedList.ToPagedList(xiaomiSet1, indexPage, pageSize, out totalCount);19 20 //list集合数据21 var xiaomiSet2 = (from i in db.xiaomi22 orderby i.id23 select new XiaoMiModel24 {25 id = i.id,26 username = i.username,27 email = i.email28 }).ToList();29 //此处为list数据集合30 miView.CachePageData = http://www.mamicode.com/ExtendPagedList.PagedCacheToList(xiaomiSet2, indexPage, pageSize, out totalCount);31 miView.TotalCount = totalCount;32 }33 return View(miView);34 }
在razor视图中展示分页数据
@model PagedListModel.ViewModels.XiaoMiViewModel@{ ViewBag.Title = "Index";}<h2>IQueryable集合(sql直接分页)数据分页</h2>@foreach (var Data in Model.PageData.ToList()){ <p>ID:@Data.id : @Data.username</p>}<!--IQueryable集合(sql直接分页)数据分页 Start--><p> 总数：@Model.TotalCount <br /> @if (Model.PageData.IsPreviousPage) { <a href=http://www.mamicode.com/"@Url.Action("Index", "Test", new { indexPage = Model.PageData.PageIndex - 1 })">上一页</a> } else { <em style="color:Gray">上一页</em> } @if (Model.PageData.IsNextPage) { <a href=http://www.mamicode.com/"@Url.Action("Index", "Test", new { indexPage = Model.PageData.PageIndex + 1 })">下一页</a> } else { <em style="color:Gray">下一页</em> }</p><br /><hr /><h2>List数据直接分页</h2><!--end-->@foreach (var Data in Model.CachePageData.ToList()){ <p>ID:@Data.id : @Data.username</p>}<!--直接list集合数据分页 Start--><p> 总数：@Model.TotalCount <br /> @if (Model.CachePageData.IsPreviousPage) { <a href=http://www.mamicode.com/"@Url.Action("Index", "Test", new { indexPage = Model.CachePageData.PageIndex - 1 })">上一页</a> } else { <em style="color:Gray">上一页</em> } @if (Model.CachePageData.IsNextPage) { <a href=http://www.mamicode.com/"@Url.Action("Index", "Test", new { indexPage = Model.CachePageData.PageIndex + 1 })">下一页</a> } else { <em style="color:Gray">下一页</em> }</p><!--end-->
好了 以上就是分页所有步骤了 。。。。
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