话不多说，直接上代码：
public class PaginatedList<T>:List<T>
{
/// <summary>
/// 当前页
/// </summary>
public int PageIndex { get; set; }
//总页面数
public int TotalPages { get; set; }
public PaginatedList(List<T> items, int count, int pageIndex, int pageSize)
{
PageIndex = pageIndex;
TotalPages = (int)Math.Ceiling(count / (decimal)pageSize);
this.AddRange(items);
}
/// <summary>
/// 判断是否有上一页
/// </summary>
public bool HasPreViousPage => (PageIndex > 1);
/// <summary>
/// 判断是否有下一页
/// </summary>
public bool HasNextPage => PageIndex < TotalPages;
/// <summary>
/// 创建分页
/// </summary>
/// <param name="source">实体信息</param>
/// <param name="pageIndex">当前页</param>
/// <param name="pageSize">当前页数据条数</param>
/// <returns></returns>
public static async Task<PaginatedList<T>> CreatepagingAsync(IQueryable<T> source,int pageIndex,int pageSize)
{
//返回实体总条数
var count = await source.CountAsync();
var items = await source.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToListAsync();
var dtos=new PaginatedList<T>(items,count,pageIndex,pageSize);
return dtos;
}
}
用到了asp.net core的IQueryable类的skip和Take函数。skip正如字面意思，跳过指定大小的数据，Take为取相邻指定大小数量的数据.
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