/// <summary>
/// 从指定<see cref="IQueryable{T}"/>集合 中查询指定分页条件的子数据集
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <typeparam name="TKey">实体主键类型</typeparam>
/// <param name="source">要查询的数据集</param>
/// <param name="predicate">查询条件谓语表达式</param>
/// <param name="pageCondition">分页查询条件</param>
/// <param name="total">输出符合条件的总记录数</param>
/// <returns></returns>
public static IQueryable <TEntity> Where <TEntity, TKey>(this IQueryable <TEntity> source,
Expression <Func <TEntity, bool> > predicate,
PageCondition pageCondition,
out int total) where TEntity : EntityBase <TKey>
{
source.CheckNotNull("source");
predicate.CheckNotNull("predicate");
pageCondition.CheckNotNull("pageCondition");
return(source.Where <TEntity, TKey>(predicate, pageCondition.PageIndex, pageCondition.PageSize, out total, pageCondition.SortConditions));
}
/// <summary>
/// 从指定<see cref="IQueryable{T}"/>集合中查询指定数据筛选的分页信息
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <typeparam name="TResult">分页数据类型</typeparam>
/// <param name="source">要查询的数据集</param>
/// <param name="predicate">查询条件谓语表达式</param>
/// <param name="pageCondition">分页查询条件</param>
/// <param name="selector">数据筛选表达式</param>
/// <returns>分页结果信息</returns>
public static PageResult <TResult> ToPage <TEntity, TResult>(this IQueryable <TEntity> source,
Expression <Func <TEntity, bool> > predicate,
PageCondition pageCondition,
Expression <Func <TEntity, TResult> > selector)
{
source.CheckNotNull("source");
predicate.CheckNotNull("predicate");
pageCondition.CheckNotNull("pageCondition");
selector.CheckNotNull("selector");
return(source.ToPage(predicate, pageCondition.PageIndex, pageCondition.PageSize, pageCondition.SortConditions, selector));
}
/// <summary>
/// 从指定<see cref="IQueryable{T}"/>集合中查询指定输出DTO的分页信息
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <typeparam name="TOutputDto">输出DTO数据类型</typeparam>
/// <param name="source">要查询的数据集</param>
/// <param name="predicate">查询条件谓语表达式</param>
/// <param name="pageCondition">分页查询条件</param>
/// <returns>分页结果信息</returns>
public static PageResult <TOutputDto> ToPage <TEntity, TOutputDto>(this IQueryable <TEntity> source,
Expression <Func <TEntity, bool> > predicate,
PageCondition pageCondition)
where TOutputDto : IOutputDto
{
source.CheckNotNull("source");
predicate.CheckNotNull("predicate");
pageCondition.CheckNotNull("pageCondition");
return(source.ToPage <TEntity, TOutputDto>(predicate,
pageCondition.PageIndex,
pageCondition.PageSize,
pageCondition.SortConditions));
}
