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Merged
SimonCropp merged 1 commit into from
Jun 13, 2026
Merged

LINQ joins, Type.GetNullableUnderlyingType, EqualityComparer.Create keySelector #558

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6 changes: 3 additions & 3 deletions apiCount.include.md
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**API count: 978**
**API count: 986**

### Per Target Framework

Expand All @@ -22,7 +22,7 @@
| `net6.0` | 512 |
| `net7.0` | 359 |
| `net8.0` | 240 |
| `net9.0` | 151 |
| `net10.0` | 98 |
| `net9.0` | 164 |
| `net10.0` | 111 |
| `net11.0` | 58 |
| `uap10.0` | 937 |
8 changes: 8 additions & 0 deletions api_list.include.md
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Expand Up @@ -340,6 +340,7 @@
#### EqualityComparer

* `EqualityComparer<T> Create(Func<T?, T?, bool>, Func<T, int>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.equalitycomparer-1.create?view=net-11.0)
* `EqualityComparer<T> Create<TKey>(Func<T?, TKey?>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.equalitycomparer-1.create?view=net-11.0#system-collections-generic-equalitycomparer-1-create-1(system-func((-0-0))-system-collections-generic-iequalitycomparer((-0))))


#### EventInfo
Expand Down Expand Up @@ -499,10 +500,16 @@

#### IEnumerable<TOuter>

* `IEnumerable<TResult> FullJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner?, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.fulljoin?view=net-11.0#system-linq-enumerable-fulljoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<(TOuter? Outer, TInner? Inner)> FullJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.fulljoin?view=net-11.0#system-linq-enumerable-fulljoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<IGrouping<TOuter, TInner>> GroupJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.groupjoin?view=net-11.0#system-linq-enumerable-groupjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<(TOuter Outer, TInner Inner)> Join<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.join?view=net-11.0#system-linq-enumerable-join-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner?, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner?, TResult>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))))
* `IEnumerable<(TOuter Outer, TInner? Inner)> LeftJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner, TResult>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))))
* `IEnumerable<(TOuter? Outer, TInner Inner)> RightJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))


#### IEnumerable<TSource>
Expand Down Expand Up @@ -1237,6 +1244,7 @@
* `bool IsAssignableFrom<T>()`
* `bool IsAssignableTo(Type?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.isassignableto?view=net-11.0)
* `bool IsAssignableTo<T>()`
* `Type? GetNullableUnderlyingType()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.getnullableunderlyingtype?view=net-11.0)
* `IsGenericMethodParameter` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.isgenericmethodparameter?view=net-11.0)


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8 changes: 4 additions & 4 deletions assemblySize.include.md
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Expand Up @@ -20,8 +20,8 @@
| net6.0 | 10.0KB | 181.5KB | +171.5KB | +10.0KB | +7.0KB | +512bytes | +3.5KB |
| net7.0 | 10.0KB | 144.0KB | +134.0KB | +9.0KB | +5.0KB | +512bytes | +3.0KB |
| net8.0 | 9.5KB | 115.0KB | +105.5KB | +8.5KB | | +512bytes | +3.5KB |
| net9.0 | 9.5KB | 69.0KB | +59.5KB | +8.5KB | | +512bytes | +3.5KB |
| net10.0 | 10.0KB | 45.5KB | +35.5KB | +8.5KB | | +512bytes | +3.0KB |
| net9.0 | 9.5KB | 72.0KB | +62.5KB | +8.5KB | | +512bytes | +3.5KB |
| net10.0 | 10.0KB | 48.5KB | +38.5KB | +9.0KB | | +1.0KB | +3.5KB |
| net11.0 | 10.0KB | 20.5KB | +10.5KB | +9.0KB | | +512bytes | +3.5KB |


Expand All @@ -47,6 +47,6 @@
| net6.0 | 10.0KB | 264.4KB | +254.4KB | +17.7KB | +8.7KB | +1.1KB | +4.2KB |
| net7.0 | 10.0KB | 208.3KB | +198.3KB | +16.6KB | +6.4KB | +1.1KB | +3.7KB |
| net8.0 | 9.5KB | 164.0KB | +154.5KB | +16.0KB | +299bytes | +1.1KB | +4.2KB |
| net9.0 | 9.5KB | 96.5KB | +87.0KB | +16.0KB | | +1.1KB | +4.2KB |
| net10.0 | 10.0KB | 64.1KB | +54.1KB | +16.0KB | | +1.1KB | +3.7KB |
| net9.0 | 9.5KB | 100.7KB | +91.2KB | +16.0KB | | +1.1KB | +4.2KB |
| net10.0 | 10.0KB | 68.3KB | +58.3KB | +16.5KB | | +1.6KB | +4.2KB |
| net11.0 | 10.0KB | 30.3KB | +20.3KB | +16.5KB | | +1.1KB | +4.2KB |
22 changes: 15 additions & 7 deletions readme.md
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Expand Up @@ -13,7 +13,7 @@ The package targets `netstandard2.0` and is designed to support the following ru
* `uap10`


**API count: 978**<!-- include: apiCount. path: /apiCount.include.md -->
**API count: 986**<!-- include: apiCount. path: /apiCount.include.md -->

### Per Target Framework

Expand All @@ -37,8 +37,8 @@ The package targets `netstandard2.0` and is designed to support the following ru
| `net6.0` | 512 |
| `net7.0` | 359 |
| `net8.0` | 240 |
| `net9.0` | 151 |
| `net10.0` | 98 |
| `net9.0` | 164 |
| `net10.0` | 111 |
| `net11.0` | 58 |
| `uap10.0` | 937 |
<!-- endInclude -->
Expand Down Expand Up @@ -114,8 +114,8 @@ This project uses features from the newest stable SDK and C# language. As such c
| net6.0 | 10.0KB | 181.5KB | +171.5KB | +10.0KB | +7.0KB | +512bytes | +3.5KB |
| net7.0 | 10.0KB | 144.0KB | +134.0KB | +9.0KB | +5.0KB | +512bytes | +3.0KB |
| net8.0 | 9.5KB | 115.0KB | +105.5KB | +8.5KB | | +512bytes | +3.5KB |
| net9.0 | 9.5KB | 69.0KB | +59.5KB | +8.5KB | | +512bytes | +3.5KB |
| net10.0 | 10.0KB | 45.5KB | +35.5KB | +8.5KB | | +512bytes | +3.0KB |
| net9.0 | 9.5KB | 72.0KB | +62.5KB | +8.5KB | | +512bytes | +3.5KB |
| net10.0 | 10.0KB | 48.5KB | +38.5KB | +9.0KB | | +1.0KB | +3.5KB |
| net11.0 | 10.0KB | 20.5KB | +10.5KB | +9.0KB | | +512bytes | +3.5KB |


Expand All @@ -141,8 +141,8 @@ This project uses features from the newest stable SDK and C# language. As such c
| net6.0 | 10.0KB | 264.4KB | +254.4KB | +17.7KB | +8.7KB | +1.1KB | +4.2KB |
| net7.0 | 10.0KB | 208.3KB | +198.3KB | +16.6KB | +6.4KB | +1.1KB | +3.7KB |
| net8.0 | 9.5KB | 164.0KB | +154.5KB | +16.0KB | +299bytes | +1.1KB | +4.2KB |
| net9.0 | 9.5KB | 96.5KB | +87.0KB | +16.0KB | | +1.1KB | +4.2KB |
| net10.0 | 10.0KB | 64.1KB | +54.1KB | +16.0KB | | +1.1KB | +3.7KB |
| net9.0 | 9.5KB | 100.7KB | +91.2KB | +16.0KB | | +1.1KB | +4.2KB |
| net10.0 | 10.0KB | 68.3KB | +58.3KB | +16.5KB | | +1.6KB | +4.2KB |
| net11.0 | 10.0KB | 30.3KB | +20.3KB | +16.5KB | | +1.1KB | +4.2KB |
<!-- endInclude -->

Expand Down Expand Up @@ -871,6 +871,7 @@ The class `Polyfill` includes the following extension methods:
#### EqualityComparer

* `EqualityComparer<T> Create(Func<T?, T?, bool>, Func<T, int>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.equalitycomparer-1.create?view=net-11.0)
* `EqualityComparer<T> Create<TKey>(Func<T?, TKey?>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.equalitycomparer-1.create?view=net-11.0#system-collections-generic-equalitycomparer-1-create-1(system-func((-0-0))-system-collections-generic-iequalitycomparer((-0))))


#### EventInfo
Expand Down Expand Up @@ -1030,10 +1031,16 @@ The class `Polyfill` includes the following extension methods:

#### IEnumerable<TOuter>

* `IEnumerable<TResult> FullJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner?, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.fulljoin?view=net-11.0#system-linq-enumerable-fulljoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<(TOuter? Outer, TInner? Inner)> FullJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.fulljoin?view=net-11.0#system-linq-enumerable-fulljoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<IGrouping<TOuter, TInner>> GroupJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.groupjoin?view=net-11.0#system-linq-enumerable-groupjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<(TOuter Outer, TInner Inner)> Join<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.join?view=net-11.0#system-linq-enumerable-join-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner?, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner?, TResult>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))))
* `IEnumerable<(TOuter Outer, TInner? Inner)> LeftJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.leftjoin?view=net-11.0#system-linq-enumerable-leftjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner, TResult>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))-system-collections-generic-iequalitycomparer((-2))))
* `IEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter?, TInner, TResult>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-4(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-func((-0-1-3))))
* `IEnumerable<(TOuter? Outer, TInner Inner)> RightJoin<TOuter, TInner, TKey>(IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, IEqualityComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.rightjoin?view=net-11.0#system-linq-enumerable-rightjoin-3(system-collections-generic-ienumerable((-0))-system-collections-generic-ienumerable((-1))-system-func((-0-2))-system-func((-1-2))-system-collections-generic-iequalitycomparer((-2))))


#### IEnumerable<TSource>
Expand Down Expand Up @@ -1768,6 +1775,7 @@ The class `Polyfill` includes the following extension methods:
* `bool IsAssignableFrom<T>()`
* `bool IsAssignableTo(Type?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.isassignableto?view=net-11.0)
* `bool IsAssignableTo<T>()`
* `Type? GetNullableUnderlyingType()` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.getnullableunderlyingtype?view=net-11.0)
* `IsGenericMethodParameter` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.type.isgenericmethodparameter?view=net-11.0)


Expand Down
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