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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.linq.parallelenumerable.union below:

ParallelEnumerable.Union Method (System.Linq) | Microsoft Learn

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Caution

The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.

This Union overload should never be called. This method is marked as obsolete and always throws NotSupportedException when called.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::ParallelQuery<TSource> ^ Union(System::Linq::ParallelQuery<TSource> ^ first, System::Collections::Generic::IEnumerable<TSource> ^ second, System::Collections::Generic::IEqualityComparer<TSource> ^ comparer);

[System.Obsolete("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")]
public static System.Linq.ParallelQuery<TSource> Union<TSource>(this System.Linq.ParallelQuery<TSource> first, System.Collections.Generic.IEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer);

[System.Obsolete("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")]
public static System.Linq.ParallelQuery<TSource> Union<TSource>(this System.Linq.ParallelQuery<TSource> first, System.Collections.Generic.IEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource>? comparer);

[<System.Obsolete("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")>]
static member Union : System.Linq.ParallelQuery<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> System.Linq.ParallelQuery<'Source>

<Extension()>
Public Function Union(Of TSource) (first As ParallelQuery(Of TSource), second As IEnumerable(Of TSource), comparer As IEqualityComparer(Of TSource)) As ParallelQuery(Of TSource)

Type Parameters

TSource

This type parameter is not used.

Parameters

second: IEnumerable<TSource>

This parameter is not used.

Returns

This overload always throws a NotSupportedException.

Attributes

Exceptions

The exception that occurs when this method is called.

One or more exceptions occurred during the evaluation of the query.

Remarks

This overload exists to disallow usage of Union with a left data source of type ParallelQuery<TSource> and a right data source of type IEnumerable<T>. Otherwise, the Union operator would appear to be binding to the parallel implementation, but would in reality bind to the sequential implementation.