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Fix #27687.

Note that the implementation does not include the following overloads:

public static IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
public static IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);

public static IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
public static IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);

I have decided to remove them since they were causing type inference issues and can be expressed trivially in terms of the other ExceptBy and IntersectBy overloads.

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ghost commented Mar 28, 2021

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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ghost commented Mar 28, 2021

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Issue Details

Fix #27687.

Note that the implementation does not include the following overloads:

public static IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
public static IEnumerable<TSource> ExceptBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);

public static IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector);
public static IEnumerable<TSource> IntersectBy<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer);

I have decided to remove them since they were causing type inference issues and can be expressed trivially in terms of the other ExceptBy and IntersectBy overloads.

Author: eiriktsarpalis
Assignees: eiriktsarpalis
Labels:

area-System.Linq

Milestone: 6.0.0

@eiriktsarpalis eiriktsarpalis requested a review from layomia March 28, 2021 17:57
@eiriktsarpalis eiriktsarpalis merged commit abd01f5 into dotnet:main Apr 9, 2021
@eiriktsarpalis eiriktsarpalis deleted the distinct-by branch April 9, 2021 21:32
cleoold added a commit to cleoold/types-linq that referenced this pull request May 6, 2021
The new linq api introduces MaxBy() and MinBy() dotnet/runtime#50335 which are different from morelinq's impl which I was referencing. To avoid conflicts, rename the my methods.

maxima_by() sounds like a more appropriate name..

Also except_by() according to the link is interesting...
@ghost ghost locked as resolved and limited conversation to collaborators May 9, 2021
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Add Enumerable.*By operators (DistinctBy, ExceptBy, IntersectBy, UnionBy, MinBy, MaxBy)

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