IQueryable的延迟执行

  public  PageList(IEnumerable < T >  source,  int  index,  int  pageSize, int  totalCount)
        {
             this .AddRange(source.Skip(index * pageSize).Take(pageSize));
             this .TotalCount  =  source.Count();
             this .PageSize = pageSize;
             this .PageIndex = index;
           
             this .TotalPageCount  =  ( int )Math.Ceiling(TotalCount  /  ( double )PageSize);
        }

据说使用IQueryable<T>后,source.Skip(index*pageSize).Take(pageSize)将与原来的source共同执行

试验中