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

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

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element.

public:
generic <typename TSource, typename TCollection, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::ParallelQuery<TResult> ^ SelectMany(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, int, System::Collections::Generic::IEnumerable<TCollection> ^> ^ collectionSelector, Func<TSource, TCollection, TResult> ^ resultSelector);

public static System.Linq.ParallelQuery<TResult> SelectMany<TSource,TCollection,TResult>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,int,System.Collections.Generic.IEnumerable<TCollection>> collectionSelector, Func<TSource,TCollection,TResult> resultSelector);

static member SelectMany : System.Linq.ParallelQuery<'Source> * Func<'Source, int, seq<'Collection>> * Func<'Source, 'Collection, 'Result> -> System.Linq.ParallelQuery<'Result>

<Extension()>
Public Function SelectMany(Of TSource, TCollection, TResult) (source As ParallelQuery(Of TSource), collectionSelector As Func(Of TSource, Integer, IEnumerable(Of TCollection)), resultSelector As Func(Of TSource, TCollection, TResult)) As ParallelQuery(Of TResult)

Type Parameters

TSource

The type of the intermediate elements collected by collectionSelector.

TCollection

The type of elements of source.

TResult

The type of elements to return.

Parameters

collectionSelector: Func<TSource,Int32,IEnumerable<TCollection>>

A transform function to apply to each source element; the second parameter of the function represents the index of the source element.

resultSelector: Func<TSource,TCollection,TResult>

A function to create a result element from an element from the first sequence and a collection of matching elements from the second sequence.

Returns

A sequence whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of source based on the index supplied to collectionSelector, and then mapping each of those sequence elements and their corresponding source element to a result element.

Exceptions

source or collectionSelector is a null reference (Nothing in Visual Basic).

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