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ProjectionDefinitionExtensionsElemMatchTDocument, TItem Method (ProjectionDefinitionTDocument, ExpressionFuncTDocument, IEnumerableTItem, ExpressionFuncTItem, Boolean)

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
public static ProjectionDefinition<TDocument> ElemMatch<TDocument, TItem>(
	this ProjectionDefinition<TDocument> projection,
	Expression<Func<TDocument, IEnumerable<TItem>>> field,
	Expression<Func<TItem, bool>> filter
)

Parameters

projection
Type: MongoDB.DriverProjectionDefinitionTDocument
The projection.
field
Type: System.Linq.ExpressionsExpressionFuncTDocument, IEnumerableTItem
The field.
filter
Type: System.Linq.ExpressionsExpressionFuncTItem, Boolean
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).
See Also