/// <summary>
/// 规约求值分页列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <returns>返回 <see cref="IPagingList{T}"/>。</returns>
public static IPagingList <T> EvaluatePagingList <T>(this IQueryable <T> queryable,
Action <IPagingList <T> > pageAction,
IEntitySpecification <T>?specification = null)
where T : class
{
IPagingList <T> list = new PagingList <T>(queryable);
if (specification is not null)
{
list.Filtrate(query => specification.Evaluate(queryable));
}
pageAction(list);
return(list);
}
/// <summary>
/// 规约求值分页列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <param name="cancellationToken">给定的 <see cref="CancellationToken"/>（可选）。</param>
/// <returns>返回一个包含 <see cref="PagingList{T}"/> 的异步操作。</returns>
public static Task <IPagingList <T> > EvaluatePagingListAsync <T>(this IQueryable <T> queryable,
Action <IPagingList <T> > pageAction, IEntitySpecification <T>?specification = null,
CancellationToken cancellationToken = default)
where T : class
{
IPagingList <T> list = new PagingList <T>(queryable);
if (specification is not null)
{
list.Filtrate(query => specification.Evaluate(queryable));
}
return(cancellationToken.RunTask(() =>
{
pageAction(list);
return list;
}));
}
