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Outer join in LINQ: retarget net10.0, add LeftJoin and RightJoin examples #2226

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Outer join in LINQ: retarget net10.0, add LeftJoin and RightJoin examples #2226

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2 changes: 1 addition & 1 deletion .../HowToCreateAnOuterJoinInLINQLeftAndRight/HowToCreateAnOuterJoinInLINQLeftAndRight.csproj
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Expand Up @@ -2,7 +2,7 @@

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
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26 changes: 26 additions & 0 deletions ...ToCreateAnOuterJoinInLINQLeftAndRight/HowToCreateAnOuterJoinInLINQLeftAndRight/Program.cs
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Expand Up @@ -52,6 +52,32 @@
Console.WriteLine();
Console.WriteLine();

Console.WriteLine("Left outer join - LeftJoin method");
Console.WriteLine();

results = Utilities.PerformLeftJoinWithLeftJoinMethod(Utilities.Songs, Utilities.Authors);

foreach (var item in results)
{
Console.WriteLine($"Title: {item.Title}, Author: {item.AuthorName}");
}

Console.WriteLine();
Console.WriteLine();

Console.WriteLine("Right outer join - RightJoin method");
Console.WriteLine();

results = Utilities.PerformRightJoinWithRightJoinMethod(Utilities.Songs, Utilities.Authors);

foreach (var item in results)
{
Console.WriteLine($"Title: {item.Title}, Author: {item.AuthorName}");
}

Console.WriteLine();
Console.WriteLine();

Console.WriteLine("Full outer join");
Console.WriteLine();

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9 changes: 2 additions & 7 deletions ...JoinInLINQLeftAndRight/HowToCreateAnOuterJoinInLINQLeftAndRight/SongWithAuthorComparer.cs
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Expand Up @@ -6,16 +6,11 @@ internal class SongWithAuthorComparer : IEqualityComparer<SongWithAuthor>
{
public bool Equals(SongWithAuthor? x, SongWithAuthor? y)
{
if (x?.AuthorName == y?.AuthorName && x?.Title == y?.Title)
{
return true;
}

return false;
return x?.AuthorName == y?.AuthorName && x?.Title == y?.Title;
}

public int GetHashCode([DisallowNull] SongWithAuthor obj)
{
return obj.AuthorName.GetHashCode();
return HashCode.Combine(obj.Title, obj.AuthorName);
}
}
32 changes: 32 additions & 0 deletions ...CreateAnOuterJoinInLINQLeftAndRight/HowToCreateAnOuterJoinInLINQLeftAndRight/Utilities.cs
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Expand Up @@ -92,6 +92,38 @@ public static List<SongWithAuthor> PerformRightJoinWithMethodSyntax(

return results.ToList();
}

public static List<SongWithAuthor> PerformLeftJoinWithLeftJoinMethod(
List<Song> songs, List<Author> authors)
{
var results = songs.LeftJoin(
authors,
song => song.AuthorId,
author => author.Id,
(song, author) => new SongWithAuthor
{
Title = song.Title,
AuthorName = author?.Name ?? "unknown"
});

return results.ToList();
}

public static List<SongWithAuthor> PerformRightJoinWithRightJoinMethod(
List<Song> songs, List<Author> authors)
{
var results = songs.RightJoin(
authors,
song => song.AuthorId,
author => author.Id,
(song, author) => new SongWithAuthor
{
Title = song?.Title ?? "-",
AuthorName = author.Name
});

return results.ToList();
}

public static List<SongWithAuthor> PerformFullOuterJoin(
List<Song> songs, List<Author> authors)
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50 changes: 50 additions & 0 deletions ...teAnOuterJoinInLINQLeftAndRight/Tests/HowToCreateAnOuterJoinInLINQLeftAndRightUnitTest.cs
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Expand Up @@ -104,6 +104,56 @@ public void GivenTwoDataSources_WhenPerformRightJoinWithMethodSyntaxMethodCalled
Assert.Equal(authors.Count, output);
}

[Fact]
public void GivenTwoDataSources_WhenPerformLeftJoinWithLeftJoinMethodCalled_ThenAllItemsFromLeftSourceAreReturned()
{
// Arrange
List<Song> songs =
[
new() { Id = 1, Title = "song A", AuthorId = 3 },
new() { Id = 2, Title = "song B", AuthorId = 1 },
new() { Id = 3, Title = "song C", AuthorId = 5 },
new() { Id = 4, Title = "song D", AuthorId = 2 }
];

List<Author> authors =
[
new() { Id = 1, Name = "Author A" },
new() { Id = 9, Name = "Author B" }
];

// Act
var output = Utilities.PerformLeftJoinWithLeftJoinMethod(songs, authors).Count;

// Assert
Assert.Equal(songs.Count, output);
}

[Fact]
public void GivenTwoDataSources_WhenPerformRightJoinWithRightJoinMethodCalled_ThenAllItemsFromRightSourceAreReturned()
{
// Arrange
List<Song> songs =
[
new() { Id = 1, Title = "song A", AuthorId = 3 },
new() { Id = 2, Title = "song B", AuthorId = 1 },
new() { Id = 3, Title = "song C", AuthorId = 5 },
new() { Id = 4, Title = "song D", AuthorId = 2 }
];

List<Author> authors =
[
new() { Id = 1, Name = "Author A" },
new() { Id = 9, Name = "Author B" }
];

// Act
var output = Utilities.PerformRightJoinWithRightJoinMethod(songs, authors).Count;

// Assert
Assert.Equal(authors.Count, output);
}

[Fact]
public void GivenTwoDataSources_WhenPerformFullOuterJoinMethodCalled_ThenAllItemsFromBothSourcesAreReturned()
{
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10 changes: 5 additions & 5 deletions csharp-linq/HowToCreateAnOuterJoinInLINQLeftAndRight/Tests/Tests.csproj
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@@ -1,7 +1,7 @@
<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>

Expand All @@ -10,13 +10,13 @@
</PropertyGroup>

<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
<PackageReference Include="xunit" Version="2.4.2" />
<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
<PackageReference Include="xunit" Version="2.9.3" />
<PackageReference Include="xunit.runner.visualstudio" Version="4.0.0">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
<PackageReference Include="coverlet.collector" Version="6.0.0">
<PackageReference Include="coverlet.collector" Version="10.0.1">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
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