namespace Entity
{ public interface IPagedList { /// <summary> /// 记录数 /// </summary> int TotalCount { get; set; } /// <summary> /// 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; } } /// <summary> /// 分页通用类 /// </summary> /// <typeparam name="T"></typeparam> public class PagedList<T> : List<T>, IPagedList { /// <summary> /// 数据源为IQueryable的范型 /// </summary> /// <param name="source">数据源</param> /// <param name="index">当前页</param> /// <param name="pageSize">每页显示多少条记录</param> public PagedList(IQueryable<T> source, int index, int pageSize) { if (source != null) //判断传过来的实体集是否为空 { int total = source.Count(); this.TotalCount = total; this.TotalPages = total / pageSize;if (total % pageSize > 0)
TotalPages++;this.PageSize = pageSize;
if (index > this.TotalPages) { index = this.TotalPages; } if (index < 1) { index = 1; } this.PageIndex = index; this.AddRange(source.Skip((index - 1) * pageSize).Take(pageSize).ToList()); //Skip是跳到第几页，Take返回多少条 } }/// <summary>
/// 总页数 /// </summary> public int TotalPages { get; set; } /// <summary> /// 总记录数 /// </summary> public int TotalCount { get; set; } /// <summary> /// 当前页 /// </summary> public int PageIndex { get; set; } /// <summary> /// 每页显示多少条记录 /// </summary> public int PageSize { get; set; } /// <summary> /// 是否有上一页 /// </summary> public bool IsPreviousPage { get { return (PageIndex > 0); } } /// <summary> /// 是否有下一页 /// </summary> public bool IsNextPage { get { return (PageIndex * PageSize) <= TotalCount; } }private NameValueCollection _AddParameters = new NameValueCollection();
/// <summary> /// 分页参数 /// </summary> public NameValueCollection AddParameters { get { return _AddParameters; } set { _AddParameters = value; } }}
/// <summary>
/// PagedList扩展类 /// </summary> public static class ExtendPagedList { /// <summary> /// 返回PagedList<T>类型的IQueryable的扩展方法 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="linq"></param> /// <param name="pageIndex"></param> /// <param name="pageSize"></param> /// <returns></returns> public static PagedList<T> ToPagedList<T>(this IQueryable<T> linq, int pageIndex, int pageSize) { return new PagedList<T>(linq, pageIndex, pageSize); } }}