ElemMatch(TDocument, TItem) Method (ProjectionDefinition(TDocument), Expression(Func(TDocument, IEnumerable(TItem))), Expression(Func(TItem, Boolean)))

ProjectionDefinitionExtensionsElemMatchTDocument, TItem Method (ProjectionDefinitionTDocument, FieldDefinitionTDocument, FilterDefinitionTItem)

Combines an existing projection with a projection that filters the contents of an array.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.20.0+ee01960089f28ea1b501690df5fc9f6318a70242

Syntax

Copy

public static ProjectionDefinition<TDocument> ElemMatch<TDocument, TItem>(
	this ProjectionDefinition<TDocument> projection,
	FieldDefinition<TDocument> field,
	FilterDefinition<TItem> filter
)

<ExtensionAttribute>
Public Shared Function ElemMatch(Of TDocument, TItem) ( 
	projection As ProjectionDefinition(Of TDocument),
	field As FieldDefinition(Of TDocument),
	filter As FilterDefinition(Of TItem)
) As ProjectionDefinition(Of TDocument)

[<ExtensionAttribute>]
static member ElemMatch : 
        projection : ProjectionDefinition<'TDocument> * 
        field : FieldDefinition<'TDocument> * 
        filter : FilterDefinition<'TItem> -> ProjectionDefinition<'TDocument>

Parameters

projection: Type: MongoDB.DriverProjectionDefinitionTDocument
The projection.
field: Type: MongoDB.DriverFieldDefinitionTDocument
The field.
filter: Type: MongoDB.DriverFilterDefinitionTItem
The filter.

Type Parameters

TDocument: The type of the document.
TItem: The type of the item.

Return Value

Type: ProjectionDefinitionTDocument
A combined projection.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ProjectionDefinitionTDocument. 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

ProjectionDefinitionExtensions Class

ElemMatch Overload

MongoDB.Driver Namespace