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: 2.16.0+eeafbea0921243a5868b81984e1083a07c1f75bc
Syntax public static ProjectionDefinition<TDocument> ElemMatch<TDocument, TItem>(
this ProjectionDefinition<TDocument> projection,
Expression<Func<TDocument, IEnumerable<TItem>>> field,
Expression<Func<TItem, bool>> filter
)
<ExtensionAttribute>
Public Shared Function ElemMatch(Of TDocument, TItem) (
projection As ProjectionDefinition(Of TDocument),
field As Expression(Of Func(Of TDocument, IEnumerable(Of TItem))),
filter As Expression(Of Func(Of TItem, Boolean))
) As ProjectionDefinition(Of TDocument)
[<ExtensionAttribute>]
static member ElemMatch :
projection : ProjectionDefinition<'TDocument> *
field : Expression<Func<'TDocument, IEnumerable<'TItem>>> *
filter : Expression<Func<'TItem, bool>> -> ProjectionDefinition<'TDocument>
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