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ProjectionDefinitionExtensions.ElemMatch<TDocument, TItem> Method (ProjectionDefinition<TDocument>, Expression<Func<TDocument, IEnumerable<TItem>>>, FilterDefinition<TItem>)

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: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2
Syntax
public static ProjectionDefinition<TDocument> ElemMatch<TDocument, TItem>(
	this ProjectionDefinition<TDocument> projection,
	Expression<Func<TDocument, IEnumerable<TItem>>> field,
	FilterDefinition<TItem> filter
)

Parameters

projection
Type: MongoDB.Driver.ProjectionDefinition<TDocument>
The projection.
field
Type: System.Linq.Expressions.Expression<Func<TDocument, IEnumerable<TItem>>>
The field.
filter
Type: MongoDB.Driver.FilterDefinition<TItem>
The filter.

Type Parameters

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

Return Value

Type: ProjectionDefinition<TDocument>
A combined projection.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ProjectionDefinition<TDocument>. 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).
See Also