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

ParallelEnumerable.SequenceEqual 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 SequenceEqual 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 bool SequenceEqual(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 bool SequenceEqual<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 bool SequenceEqual<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 SequenceEqual : System.Linq.ParallelQuery<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> bool

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

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

Thrown every time this method is called.

Remarks

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