/// <summary>
/// 工厂方法
/// </summary>
/// <param name="source"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="totalCount"></param>
/// <returns></returns>
public static PagerQueryResult <TOutputDto> Create(IEnumerable <TOutputDto> source, int pageIndex, int pageSize, int totalCount)
{
var instance = new PagerQueryResult <TOutputDto>();
//NbGuard.MakeSureBetweenInclusive(pageIndex, 1, int.MaxValue);
//NbGuard.MakeSureBetweenInclusive(pageSize, 1, int.MaxValue);
//NbGuard.MakeSureBetweenInclusive(totalCount, 0, int.MaxValue);
if (source == null)
{
throw new ArgumentNullException("source");
}
if (pageIndex < 0 || pageSize < 0)
{
// Check: check if pageSize > totalCount.
// Check: check if int parameters < 0.
throw new ArgumentException("非法的参数");
}
foreach (var item in source)
{
instance.Result.Add(item);
}
instance.PageIndex = pageIndex;
instance.PageSize = pageSize;
instance.TotalCount = totalCount;
return(instance);
}
/// <summary>
/// 返回空的结果
/// </summary>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <returns></returns>
public static PagerQueryResult <TOutputDto> CreateEmpty(int pageIndex, int pageSize)
{
var instance = new PagerQueryResult <TOutputDto>();
instance.PageIndex = pageIndex;
instance.PageSize = pageSize;
instance.TotalCount = 0;
return(instance);
}
/// <summary>
/// 带分页的结果
/// </summary>
/// <typeparam name="TOutputDto"></typeparam>
/// <param name="source"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="totalCount"></param>
/// <returns></returns>
public static PagerQueryResult <TOutputDto> WithPage <TOutputDto>(this IEnumerable <TOutputDto> source, int pageIndex, int pageSize, int totalCount)
{
return(PagerQueryResult <TOutputDto> .Create(source, pageIndex, pageSize, totalCount));
}