Outer join in LINQ: retarget net10.0, add LeftJoin and RightJoin examples - #2226
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…ples - Retarget both projects from net8.0 to net10.0. - Bump test packages: Microsoft.NET.Test.Sdk 18.10.1, xunit 2.9.3, xunit.runner.visualstudio 4.0.0, coverlet.collector 10.0.1. - Add PerformLeftJoinWithLeftJoinMethod and PerformRightJoinWithRightJoinMethod using the .NET 10 Enumerable.LeftJoin and Enumerable.RightJoin operators. - Add two tests for the new methods (8 tests become 10). - SongWithAuthorComparer: Equals returns the expression directly, and GetHashCode combines Title and AuthorName with HashCode.Combine. - Program.cs prints the two new joins.
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Sample update for "How to Create an Outer Join in LINQ" (code-maze.com/csharp-outer-join-linq/). This PR touches only csharp-linq/HowToCreateAnOuterJoinInLINQLeftAndRight.
Changes:
Package versions were re-queried on NuGet on 2026-09-23. Microsoft.NET.Test.Sdk is 18.10.1 today, one patch above the 18.10.0 the batch plan named, so 18.10.1 is what this PR uses. The other three match the plan.
Verified locally on SDK 10.0.302, runtime Microsoft.NETCore.App 10.0.10: dotnet build -c Release with 0 warnings and 0 errors, dotnet test with 10 of 10 passing, and dotnet list package --vulnerable --include-transitive clean on both projects. The console output of the existing sections is unchanged.