ProjectionDefinitionExtensions.ElemMatch<TDocument, TItem> Method (ProjectionDefinition<TDocument>, Expression<Func<TDocument, IEnumerable<TItem>>>, Expression<Func<TItem, 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: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2
Syntaxpublic 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.Driver.ProjectionDefinition<TDocument>
The projection. - field
- Type: System.Linq.Expressions.Expression<Func<TDocument, IEnumerable<TItem>>>
The field. - filter
- Type: System.Linq.Expressions.Expression<Func<TItem, Boolean>>
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