/// <summary>
/// Filters a sequence of values to return descendants of all given items.
/// </summary>
/// <param name="collection">sequence to filter. </param>
/// <param name="items">sequence of parent items to find it's descendants. </param>
/// <param name="depth">Level of inheritance to filter descendants.
/// 1 returns only direct children, 2 - children of children etc.
/// -1 to return all descendants down to deepest leaves.
/// -1 by default. </param>
/// <param name="includeSelf">Whether or not to include given parent items itself in list. false by default. </param>
/// <typeparam name="TResult">Type of sequence containing ancestors elements. Should implement <see cref="IHasTreeEntry"/>. </typeparam>
/// <typeparam name="TFilter">Type of referenced items to use in filter. Should implement <see cref="IHasTreeEntry"/>. </typeparam>
/// <returns>Sequence of descendants of given items. </returns>
public static IQueryable <TResult> DescendantsOfAny <TResult, TFilter>(
this IQueryable <TResult> collection,
IEnumerable <TFilter> items,
int depth = -1,
bool includeSelf = false)
where TResult : IHasTreeEntry
where TFilter : IHasTreeEntry
{
return(collection.Where(i => i.TreeEntry, NestedIntervalsSpec.DescendantsOfAll(items, depth, includeSelf)));
}
/// <summary>
/// Filters a sequence of values to return descendants of all given items.
/// </summary>
/// <param name="collection">sequence to filter. </param>
/// <param name="navigateExpr">Property expression returning path to IHasTreeEntry item. </param>
/// <param name="items">sequence of parent items to find it's descendants. </param>
/// <param name="depth">Level of inheritance to filter descendants.
/// 1 returns only direct children, 2 - children of children etc.
/// -1 to return all descendants down to deepest leaves.
/// -1 by default. </param>
/// <param name="includeSelf">Whether or not to include given parent items itself in list. false by default. </param>
/// <typeparam name="TResult">Type of sequence containing descendants elements. Should implement <see cref="IHasTreeEntry"/>. </typeparam>
/// <typeparam name="TFilter">Type of referenced items to use in filter. Should implement <see cref="IHasTreeEntry"/>. </typeparam>
/// <returns>Sequence of descendants of given items. </returns>
public static IQueryable <TResult> DescendantsOfAny <TResult, TFilter>(
this IQueryable <TResult> collection,
Expression <Func <TResult, IHasTreeEntry> > navigateExpr,
IEnumerable <TFilter> items,
int depth = -1,
bool includeSelf = false)
where TFilter : IHasTreeEntry
{
return(collection.Where(navigateExpr.Navigate(i => i.TreeEntry), NestedIntervalsSpec.DescendantsOfAll(items, depth, includeSelf)));
}