AsyncEnumerable.UnionBy Method
Definition
Important
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Overloads
| UnionBy<TSource,TKey>(IAsyncEnumerable<TSource>, IAsyncEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>) |
Produces the set union of two sequences according to a specified key selector function. |
| UnionBy<TSource,TKey>(IAsyncEnumerable<TSource>, IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, IEqualityComparer<TKey>) |
Produces the set union of two sequences according to a specified key selector function. |
UnionBy<TSource,TKey>(IAsyncEnumerable<TSource>, IAsyncEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
- Source:
- UnionBy.cs
Produces the set union of two sequences according to a specified key selector function.
public static System.Collections.Generic.IAsyncEnumerable<TSource> UnionBy<TSource,TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer = default);static member UnionBy : System.Collections.Generic.IAsyncEnumerable<'Source> * System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<'Source><Extension()>
Public Function UnionBy(Of TSource, TKey) (first As IAsyncEnumerable(Of TSource), second As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), Optional comparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of TSource)Type Parameters
- TSource
The type of the elements of the input sequences.
- TKey
The type of key to identify elements by.
Parameters
- first
- IAsyncEnumerable<TSource>
An IAsyncEnumerable<T> whose distinct elements form the first set for the union.
- second
- IAsyncEnumerable<TSource>
An IAsyncEnumerable<T> whose distinct elements form the second set for the union.
- keySelector
- Func<TSource,TKey>
A function to extract the key for each element.
- comparer
- IEqualityComparer<TKey>
The IEqualityComparer<T> to compare values.
Returns
An IAsyncEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
Exceptions
second is null.
Applies to
UnionBy<TSource,TKey>(IAsyncEnumerable<TSource>, IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, IEqualityComparer<TKey>)
- Source:
- UnionBy.cs
Produces the set union of two sequences according to a specified key selector function.
public static System.Collections.Generic.IAsyncEnumerable<TSource> UnionBy<TSource,TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, Func<TSource,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer = default);static member UnionBy : System.Collections.Generic.IAsyncEnumerable<'Source> * System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Key>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<'Source><Extension()>
Public Function UnionBy(Of TSource, TKey) (first As IAsyncEnumerable(Of TSource), second As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, CancellationToken, ValueTask(Of TKey)), Optional comparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of TSource)Type Parameters
- TSource
The type of the elements of the input sequences.
- TKey
The type of key to identify elements by.
Parameters
- first
- IAsyncEnumerable<TSource>
An IAsyncEnumerable<T> whose distinct elements form the first set for the union.
- second
- IAsyncEnumerable<TSource>
An IAsyncEnumerable<T> whose distinct elements form the second set for the union.
- keySelector
- Func<TSource,CancellationToken,ValueTask<TKey>>
A function to extract the key for each element.
- comparer
- IEqualityComparer<TKey>
The IEqualityComparer<T> to compare values.
Returns
An IAsyncEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
Exceptions
second is null.
