public class PageList<T>:List<T>
{
public int CurrentPage {private set; get; }//当前页
public int TotalPages {private set; get; }//总页数
public int PageSize {private set; get; }//单页内容数量
public int TotalCount {private set; get; }//数据总数
public bool HasPrevious => CurrentPage > 1;//是否有前一页
public bool HasNext => CurrentPage < TotalPages;//是否有前一页
public PageList(List<T> items, int count ,int pageNumber,int pageSize)
{
TotalCount = count;
PageSize = pageSize;
CurrentPage = pageNumber;
TotalPages = (int)Math.Ceiling((double)count / pageSize);//取最大整数
AddRange(items);//****************************************************************************************
}
public static async Task<PageList<T>>CreateAsync(IQueryable<T> source, int pageNumber, int pageSize)
{
var count =await source.CountAsync();
var items = await source.Skip((pageNumber - 1) * pageSize).Take(pageSize).ToListAsync();//取从(pageNumber - 1) * pageSize向后pageSize个数据
return new PageList<T>(items, count, pageNumber, pageSize);
}
}