/// <summary>
/// 分页
/// </summary>
/// <typeparam name="TDto">查询对象</typeparam>
/// <param name="paging">分页对象</param>
/// <param name="specification">查询对象</param>
/// <param name="pagingBefore">分页前</param>
/// <param name="pagingAfter">分页后</param>
/// <returns></returns>
public virtual IPagingResult <TDto> Paging <TDto>(IPaging paging,
ISpecification <TDto> specification,
Func <IQueryable <TDto>, IQueryable <TDto> > pagingBefore = null,
Func <IQueryable <TDto>, IQueryable <TDto> > pagingAfter = null)
{
var query = this._storage.AsQueryable <TDto>();
if (specification != null && specification.Expression != null)
{
query = query.Where(specification.Expression);
}
paging.TotalNumber = query.Count();
if (pagingBefore != null)
{
query = pagingBefore(query);
}
query = query.Skip((paging.PageIndex - 1) * paging.PageSize)
.Take(paging.PageSize);
if (pagingAfter != null)
{
query = pagingAfter(query);
}
return(PagingResult.Build(paging, query.ToList()));
}
