vNext: Support new System.Linq.Queryable methods which are introduced in .NET 6

[StefH]

[StefH]

@eiriktsarpalis
Do you have a changelog / list from all the changes done for .NET for https://docs.microsoft.com/en-us/dotnet/api/system.linq.iqueryable-1?view=net-6.0 ?

[eiriktsarpalis]

A high-level overview of the LINQ additions can be found in the .NET 6 Preview 4 announcement. We also maintain an API diff in our release notes, however they are being posted incrementally on a preview-by-preview basis. Tagging @Anipik who might know when we will be releasing the full diff for .NET 6 compared to .NET 5 (presumably when RC1 ships?).

The full list of new queryable APIs can be found on the dotnet/runtime repo, for example:

git diff v5.0.0 v6.0.0-preview.6.21352.12 -- src/libraries/System.Linq.Queryable/ref/System.Linq.Queryable.cs

produces the following new Queryable APIs:

public static class Queryable
{
    public static System.Linq.IQueryable<TSource[]> Chunk<TSource>(this System.Linq.IQueryable<TSource> source, int size) { 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 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, System.Index 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 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 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 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? 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, System.Collections.Generic.IComparer<TSource>? comparer) { 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, System.Collections.Generic.IComparer<TSource>? comparer) { 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 System.Linq.IQueryable<TSource> Take<TSource>(this System.Linq.IQueryable<TSource> source, System.Range range) { 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<(TFirst First, TSecond Second, TThird Third)> Zip<TFirst, TSecond, TThird>(this System.Linq.IQueryable<TFirst> source1, System.Collections.Generic.IEnumerable<TSecond> source2, System.Collections.Generic.IEnumerable<TThird> source3) { throw null; }
}

We are not planning on including more APIs for .NET 6. Do note that the above only concerns preview releases, so they are still subject to change theoretically speaking.

Hope this helps.

[Anipik]

We will wait for the 6.0 release for a complete diff

[StefH]

#551