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

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

MongoQueryableSelectManyTSource, TCollection, TResult Method (IMongoQueryableTSource, ExpressionFuncTSource, IEnumerableTCollection, ExpressionFuncTSource, TCollection, TResult)

Projects each element of a sequence to an IEnumerableT 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: 2.4.1

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.LinqIMongoQueryableTSource
A sequence of values to project.
collectionSelector: Type: System.Linq.ExpressionsExpressionFuncTSource, IEnumerableTCollection
A projection function to apply to each element of the input sequence.
resultSelector: Type: System.Linq.ExpressionsExpressionFuncTSource, 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: IMongoQueryableTResult
An IMongoQueryableT 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 IMongoQueryableTSource. 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