SelectMany(TSource, TCollection, TResult) Method (IMongoQueryable(TSource), Expression(Func(TSource, IEnumerable(TCollection))), Expression(Func(TSource, TCollection, TResult)))

MongoQueryable.SelectMany<TSource, TCollection, TResult> Method (IMongoQueryable<TSource>, Expression<Func<TSource, IEnumerable<TCollection>>>, Expression<Func<TSource, TCollection, TResult>>)

Projects each element of a sequence to an IEnumerable<T> and invokes a result selector function on each element therein. The resulting values from each intermediate sequence are combined into a single, one-dimensional sequence and returned.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.19.1+3a2a09dd959482f665ffbb5df2557ec541597af4

Syntax

Copy

public static IMongoQueryable<TResult> SelectMany<TSource, TCollection, TResult>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, IEnumerable<TCollection>>> collectionSelector,
	Expression<Func<TSource, TCollection, TResult>> resultSelector
)

<ExtensionAttribute>
Public Shared Function SelectMany(Of TSource, TCollection, TResult) ( 
	source As IMongoQueryable(Of TSource),
	collectionSelector As Expression(Of Func(Of TSource, IEnumerable(Of TCollection))),
	resultSelector As Expression(Of Func(Of TSource, TCollection, TResult))
) As IMongoQueryable(Of TResult)

[<ExtensionAttribute>]
static member SelectMany : 
        source : IMongoQueryable<'TSource> * 
        collectionSelector : Expression<Func<'TSource, IEnumerable<'TCollection>>> * 
        resultSelector : Expression<Func<'TSource, 'TCollection, 'TResult>> -> IMongoQueryable<'TResult>

Parameters

source: Type: MongoDB.Driver.Linq.IMongoQueryable<TSource>
A sequence of values to project.
collectionSelector: Type: System.Linq.Expressions.Expression<Func<TSource, IEnumerable<TCollection>>>
A projection function to apply to each element of the input sequence.
resultSelector: Type: System.Linq.Expressions.Expression<Func<TSource, TCollection, TResult>>
A projection function to apply to each element of each intermediate sequence.

Type Parameters

TSource: The type of the elements of source.
TCollection: The type of the intermediate elements collected by the function represented by collectionSelector.
TResult: The type of the elements of the resulting sequence.

Return Value

Type: IMongoQueryable<TResult>
An IMongoQueryable<T> whose elements are the result of invoking the one-to-many projection function collectionSelector on each element of source and then mapping each of those sequence elements and their corresponding source element to a result element.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IMongoQueryable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Reference

MongoQueryable Class

SelectMany Overload

MongoDB.Driver.Linq Namespace