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Implement Enumerable.*By methods (DistinctBy, ExceptBy, IntersectBy, …
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…UnionBy, MinBy, MaxBy) (#50335)

* Implement Enumerable.*By operators

* apply feedback

* Update src/libraries/System.Linq/src/System/Linq/Distinct.cs

Co-authored-by: Stephen Toub <stoub@microsoft.com>

Co-authored-by: Stephen Toub <stoub@microsoft.com>
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@eiriktsarpalis @stephentoub
eiriktsarpalis and stephentoub authored Apr 9, 2021
1 parent f4df53b commit abd01f5
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Showing 23 changed files with 1,802 additions and 34 deletions.
24 changes: 19 additions & 5 deletions src/libraries/System.Linq.Queryable/ref/System.Linq.Queryable.cs
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Expand Up @@ -77,18 +77,22 @@ public static partial class Queryable
public static int Count<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static System.Linq.IQueryable<TSource> DefaultIfEmpty<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static System.Linq.IQueryable<TSource> DefaultIfEmpty<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static System.Linq.IQueryable<TSource> DistinctBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static System.Linq.IQueryable<TSource> DistinctBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> Distinct<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static System.Linq.IQueryable<TSource> Distinct<TSource>(this System.Linq.IQueryable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource>? comparer) { throw null; }
public static TSource? ElementAtOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, int index) { throw null; }
public static TSource? ElementAtOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Index index) { throw null; }
public static TSource ElementAt<TSource>(this System.Linq.IQueryable<TSource> source, int index) { throw null; }
public static TSource? ElementAtOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, int index) { throw null; }
public static TSource ElementAt<TSource>(this System.Linq.IQueryable<TSource> source, System.Index index) { throw null; }
public static TSource ElementAt<TSource>(this System.Linq.IQueryable<TSource> source, int index) { throw null; }
public static System.Linq.IQueryable<TSource> ExceptBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TKey> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static System.Linq.IQueryable<TSource> ExceptBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TKey> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> Except<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2) { throw null; }
public static System.Linq.IQueryable<TSource> Except<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Collections.Generic.IEqualityComparer<TSource>? comparer) { throw null; }
public static TSource? FirstOrDefault<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource FirstOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource? FirstOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static TSource FirstOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate, TSource defaultValue) { throw null; }
public static TSource FirstOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource First<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource First<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static System.Linq.IQueryable<System.Linq.IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
Expand All @@ -101,21 +105,29 @@ public static partial class Queryable
public static System.Linq.IQueryable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Linq.Expressions.Expression<System.Func<TSource, TElement>> elementSelector, System.Linq.Expressions.Expression<System.Func<TKey, System.Collections.Generic.IEnumerable<TElement>, TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<System.Func<TOuter, TKey>> outerKeySelector, System.Linq.Expressions.Expression<System.Func<TInner, TKey>> innerKeySelector, System.Linq.Expressions.Expression<System.Func<TOuter, System.Collections.Generic.IEnumerable<TInner>, TResult>> resultSelector) { throw null; }
public static System.Linq.IQueryable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<System.Func<TOuter, TKey>> outerKeySelector, System.Linq.Expressions.Expression<System.Func<TInner, TKey>> innerKeySelector, System.Linq.Expressions.Expression<System.Func<TOuter, System.Collections.Generic.IEnumerable<TInner>, TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> IntersectBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TKey> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static System.Linq.IQueryable<TSource> IntersectBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TKey> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> Intersect<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2) { throw null; }
public static System.Linq.IQueryable<TSource> Intersect<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Collections.Generic.IEqualityComparer<TSource>? comparer) { throw null; }
public static System.Linq.IQueryable<TResult> Join<TOuter, TInner, TKey, TResult>(this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<System.Func<TOuter, TKey>> outerKeySelector, System.Linq.Expressions.Expression<System.Func<TInner, TKey>> innerKeySelector, System.Linq.Expressions.Expression<System.Func<TOuter, TInner, TResult>> resultSelector) { throw null; }
public static System.Linq.IQueryable<TResult> Join<TOuter, TInner, TKey, TResult>(this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<System.Func<TOuter, TKey>> outerKeySelector, System.Linq.Expressions.Expression<System.Func<TInner, TKey>> innerKeySelector, System.Linq.Expressions.Expression<System.Func<TOuter, TInner, TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static TSource? LastOrDefault<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource LastOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource? LastOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static TSource LastOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate, TSource defaultValue) { throw null; }
public static TSource LastOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource Last<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource Last<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static long LongCount<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static long LongCount<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static TSource? MaxBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static TSource? MaxBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IComparer<TSource>? comparer) { throw null; }
public static TSource? Max<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource? Max<TSource>(this System.Linq.IQueryable<TSource> source, System.Collections.Generic.IComparer<TSource>? comparer) { throw null; }
public static TResult? Max<TSource, TResult>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TResult>> selector) { throw null; }
public static TSource? MinBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static TSource? MinBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IComparer<TSource>? comparer) { throw null; }
public static TSource? Min<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource? Min<TSource>(this System.Linq.IQueryable<TSource> source, System.Collections.Generic.IComparer<TSource>? comparer) { throw null; }
public static TResult? Min<TSource, TResult>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TResult>> selector) { throw null; }
public static System.Linq.IQueryable<TResult> OfType<TResult>(this System.Linq.IQueryable source) { throw null; }
public static System.Linq.IOrderedQueryable<TSource> OrderByDescending<TSource, TKey>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
Expand All @@ -133,9 +145,9 @@ public static partial class Queryable
public static bool SequenceEqual<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2) { throw null; }
public static bool SequenceEqual<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Collections.Generic.IEqualityComparer<TSource>? comparer) { throw null; }
public static TSource? SingleOrDefault<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource SingleOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource? SingleOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static TSource SingleOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate, TSource defaultValue) { throw null; }
public static TSource SingleOrDefault<TSource>(this System.Linq.IQueryable<TSource> source, TSource defaultValue) { throw null; }
public static TSource Single<TSource>(this System.Linq.IQueryable<TSource> source) { throw null; }
public static TSource Single<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
public static System.Linq.IQueryable<TSource> SkipLast<TSource>(this System.Linq.IQueryable<TSource> source, int count) { throw null; }
Expand Down Expand Up @@ -171,6 +183,8 @@ public static partial class Queryable
public static System.Linq.IOrderedQueryable<TSource> ThenByDescending<TSource, TKey>(this System.Linq.IOrderedQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IComparer<TKey>? comparer) { throw null; }
public static System.Linq.IOrderedQueryable<TSource> ThenBy<TSource, TKey>(this System.Linq.IOrderedQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static System.Linq.IOrderedQueryable<TSource> ThenBy<TSource, TKey>(this System.Linq.IOrderedQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> UnionBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector) { throw null; }
public static System.Linq.IQueryable<TSource> UnionBy<TSource, TKey>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Linq.Expressions.Expression<System.Func<TSource, TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> Union<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2) { throw null; }
public static System.Linq.IQueryable<TSource> Union<TSource>(this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Collections.Generic.IEqualityComparer<TSource>? comparer) { throw null; }
public static System.Linq.IQueryable<TSource> Where<TSource>(this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<System.Func<TSource, bool>> predicate) { throw null; }
Expand Down
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