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