ProjectionDefinitionExtensionsElemMatchTDocument, TItem Method (ProjectionDefinitionTDocument, ExpressionFuncTDocument, IEnumerableTItem, 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: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
Syntax public static ProjectionDefinition<TDocument> ElemMatch<TDocument, TItem>(
this ProjectionDefinition<TDocument> projection,
Expression<Func<TDocument, IEnumerable<TItem>>> field,
FilterDefinition<TItem> 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 FilterDefinition(Of TItem)
) As ProjectionDefinition(Of TDocument)
[<ExtensionAttribute>]
static member ElemMatch :
projection : ProjectionDefinition<'TDocument> *
field : Expression<Func<'TDocument, IEnumerable<'TItem>>> *
filter : FilterDefinition<'TItem> -> ProjectionDefinition<'TDocument>
Parameters
- projection
- Type: MongoDB.DriverProjectionDefinitionTDocument
The projection. - field
- Type: System.Linq.ExpressionsExpressionFuncTDocument, IEnumerableTItem
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).
See Also