/// <summary>
/// 初始化枚举迭代器的新实例
/// </summary>
/// <param name="move">获取下一页数据的委托</param>
/// <param name="startPageIndex">起始页</param>
/// <param name="pageSize">每个页面的数据数量</param>
/// <param name="total"></param>
public PageEnumerator(PageMoveDelegate <T> move,
int startPageIndex,
int pageSize,
int total)
{
_move = move ?? throw new ArgumentNullException(nameof(move));
_startPageIndex = startPageIndex < 0
? throw new ArgumentOutOfRangeException(nameof(startPageIndex))
: startPageIndex;
_pageSize = pageSize < 0
? throw new ArgumentOutOfRangeException(nameof(pageSize))
: pageSize;
_total = total < 0
? throw new ArgumentOutOfRangeException(nameof(total))
: total;
_currentPageIndex = startPageIndex;
_currentPageDatas = move(startPageIndex, pageSize, CancellationToken.None)
.ConfigureAwait(false)
.GetAwaiter()
.GetResult();
TotalPageCount = (int)Math.Ceiling((total * 1.0) / pageSize);
}
/// <summary>
/// 初始化分页的枚举
/// </summary>
/// <param name="move">用于开始翻页的委托</param>
/// <param name="startPageIndex">起始页</param>
/// <param name="pageSize">每页获取数据的数量</param>
/// <param name="total"></param>
public PageEnumerable(PageMoveDelegate <T> move,
int startPageIndex,
int pageSize,
int total)
{
_move = move ?? throw new ArgumentNullException(nameof(move));
_total = total < 0
? throw new ArgumentOutOfRangeException(nameof(total), ERROR_TOTAL)
: total;
_startPageIndex = startPageIndex < 1
? throw new ArgumentOutOfRangeException(nameof(startPageIndex), ERROR_STARTPAGE)
: startPageIndex;
_pageSize = pageSize < 0
? throw new ArgumentOutOfRangeException(nameof(pageSize), ERROR_PAGESIZE)
: pageSize;
}
