Queryable.UnionBy Method

Definition

Namespace:: System.Linq

Assemblies:: netstandard.dll, System.Linq.Queryable.dll

Important

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Overloads

Name	Description
UnionBy(IQueryable, IEnumerable, Expression>)	Produces the set union of two sequences according to a specified key selector function.
UnionBy(IQueryable, IEnumerable, Expression>, IEqualityComparer)	Produces the set union of two sequences according to a specified key selector function.

UnionBy(IQueryable, IEnumerable, Expression>)

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Produces the set union of two sequences according to a specified key selector function.

public:
generic 
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable ^ UnionBy(System::Linq::IQueryable ^ source1, System::Collections::Generic::IEnumerable ^ source2, System::Linq::Expressions::Expression ^> ^ keySelector);

public static System.Linq.IQueryable UnionBy(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Linq.Expressions.Expression> keySelector);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable UnionBy(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Linq.Expressions.Expression> keySelector);

static member UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression> -> System.Linq.IQueryable<'Source>

[]
static member UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression> -> System.Linq.IQueryable<'Source>


Public Function UnionBy(Of TSource, TKey) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey))) As IQueryable(Of TSource)

Type Parameters

TSource

The type of the elements of the input sequences.

TKey

The type of key to identify elements by.

Parameters

source1: IQueryable

An IQueryable whose distinct elements form the first set for the union.

source2: IEnumerable

An IEnumerable whose distinct elements form the second set for the union.

keySelector: Expression<Func>

A function to extract the key for each element.

Returns

IQueryable

An IEnumerable that contains the elements from both input sequences, excluding duplicates.

Attributes: RequiresDynamicCodeAttribute

Exceptions

ArgumentNullException

source1 or source2 is null.

Applies to

UnionBy(IQueryable, IEnumerable, Expression>, IEqualityComparer)

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Source:: Queryable.cs

Produces the set union of two sequences according to a specified key selector function.

public:
generic 
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable ^ UnionBy(System::Linq::IQueryable ^ source1, System::Collections::Generic::IEnumerable ^ source2, System::Linq::Expressions::Expression ^> ^ keySelector, System::Collections::Generic::IEqualityComparer ^ comparer);

public static System.Linq.IQueryable UnionBy(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Linq.Expressions.Expression> keySelector, System.Collections.Generic.IEqualityComparer? comparer);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable UnionBy(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Linq.Expressions.Expression> keySelector, System.Collections.Generic.IEqualityComparer? comparer);

static member UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.IQueryable<'Source>

[]
static member UnionBy : System.Linq.IQueryable<'Source> * seq<'Source> * System.Linq.Expressions.Expression> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.IQueryable<'Source>


Public Function UnionBy(Of TSource, TKey) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)), comparer As IEqualityComparer(Of TKey)) As IQueryable(Of TSource)