| IAggregateFluentExtensionsGraphLookupTResult, TFrom, TConnectFrom, TConnectTo, TStartWith, TAsElement, TAs, TNewResult Method (IAggregateFluentTResult, IMongoCollectionTFrom, ExpressionFuncTFrom, TConnectFrom, ExpressionFuncTFrom, TConnectTo, ExpressionFuncTResult, TStartWith, ExpressionFuncTNewResult, TAs, ExpressionFuncTAsElement, Int32, AggregateGraphLookupOptionsTFrom, TAsElement, TNewResult) | 
 
            Appends a $graphLookup stage to the pipeline.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.12.2+a4a3888f4fb51bb518b1eb5002effc2d47f2ea6a
 Syntax
Syntaxpublic static IAggregateFluent<TNewResult> GraphLookup<TResult, TFrom, TConnectFrom, TConnectTo, TStartWith, TAsElement, TAs, TNewResult>(
	this IAggregateFluent<TResult> aggregate,
	IMongoCollection<TFrom> from,
	Expression<Func<TFrom, TConnectFrom>> connectFromField,
	Expression<Func<TFrom, TConnectTo>> connectToField,
	Expression<Func<TResult, TStartWith>> startWith,
	Expression<Func<TNewResult, TAs>> as,
	Expression<Func<TAsElement, int>> depthField,
	AggregateGraphLookupOptions<TFrom, TAsElement, TNewResult> options = null
)
where TAs : Object, IEnumerable<TAsElement>
<ExtensionAttribute>
Public Shared Function GraphLookup(Of TResult, TFrom, TConnectFrom, TConnectTo, TStartWith, TAsElement, TAs As {Object, IEnumerable(Of TAsElement)}, TNewResult) ( 
	aggregate As IAggregateFluent(Of TResult),
	from As IMongoCollection(Of TFrom),
	connectFromField As Expression(Of Func(Of TFrom, TConnectFrom)),
	connectToField As Expression(Of Func(Of TFrom, TConnectTo)),
	startWith As Expression(Of Func(Of TResult, TStartWith)),
	as As Expression(Of Func(Of TNewResult, TAs)),
	depthField As Expression(Of Func(Of TAsElement, Integer)),
	Optional options As AggregateGraphLookupOptions(Of TFrom, TAsElement, TNewResult) = Nothing
) As IAggregateFluent(Of TNewResult)[<ExtensionAttribute>]
static member GraphLookup : 
        aggregate : IAggregateFluent<'TResult> * 
        from : IMongoCollection<'TFrom> * 
        connectFromField : Expression<Func<'TFrom, 'TConnectFrom>> * 
        connectToField : Expression<Func<'TFrom, 'TConnectTo>> * 
        startWith : Expression<Func<'TResult, 'TStartWith>> * 
        as : Expression<Func<'TNewResult, 'TAs>> * 
        depthField : Expression<Func<'TAsElement, int>> * 
        ?options : AggregateGraphLookupOptions<'TFrom, 'TAsElement, 'TNewResult> 
(* Defaults:
        let _options = defaultArg options null
*)
-> IAggregateFluent<'TNewResult>  when 'TAs : Object and IEnumerable<'TAsElement>
Parameters
- aggregate
- Type: MongoDB.DriverIAggregateFluentTResult
 The aggregate.
- from
- Type: MongoDB.DriverIMongoCollectionTFrom
 The from collection.
- connectFromField
- Type: System.Linq.ExpressionsExpressionFuncTFrom, TConnectFrom
 The connect from field.
- connectToField
- Type: System.Linq.ExpressionsExpressionFuncTFrom, TConnectTo
 The connect to field.
- startWith
- Type: System.Linq.ExpressionsExpressionFuncTResult, TStartWith
 The start with value.
- as
- Type: System.Linq.ExpressionsExpressionFuncTNewResult, TAs
 The as field.
- depthField
- Type: System.Linq.ExpressionsExpressionFuncTAsElement, Int32
 The depth field.
- options (Optional)
- Type: MongoDB.DriverAggregateGraphLookupOptionsTFrom, TAsElement, TNewResult
 The options.
Type Parameters
- TResult
- The type of the result.
- TFrom
- The type of the from documents.
- TConnectFrom
- The type of the connect from field (must be either TConnectTo or a type that implements IEnumerable{TConnectTo}).
- TConnectTo
- The type of the connect to field.
- TStartWith
- The type of the start with expression (must be either TConnectTo or a type that implements IEnumerable{TConnectTo}).
- TAsElement
- The type of the as field elements.
- TAs
- The type of the as field.
- TNewResult
- The type of the new result (must be same as TResult with an additional as field).
Return Value
Type: 
IAggregateFluentTNewResultThe fluent aggregate interface.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type 
IAggregateFluentTResult. 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
See Also