| IMongoCollectionExtensionsDistinctAsyncTDocument, TField Method (IMongoCollectionTDocument, ExpressionFuncTDocument, TField, ExpressionFuncTDocument, Boolean, DistinctOptions, CancellationToken) | 
 
            Gets the distinct values for a specified field.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.5.0+57.Branch.master.Sha.6a4e00a2d91090c65a9b11364b9ebfdb9c7da076
 Syntax
Syntaxpublic static Task<IAsyncCursor<TField>> DistinctAsync<TDocument, TField>(
	this IMongoCollection<TDocument> collection,
	Expression<Func<TDocument, TField>> field,
	Expression<Func<TDocument, bool>> filter,
	DistinctOptions options = null,
	CancellationToken cancellationToken = null
)
<ExtensionAttribute>
Public Shared Function DistinctAsync(Of TDocument, TField) ( 
	collection As IMongoCollection(Of TDocument),
	field As Expression(Of Func(Of TDocument, TField)),
	filter As Expression(Of Func(Of TDocument, Boolean)),
	Optional options As DistinctOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of IAsyncCursor(Of TField))
[<ExtensionAttribute>]
static member DistinctAsync : 
        collection : IMongoCollection<'TDocument> * 
        field : Expression<Func<'TDocument, 'TField>> * 
        filter : Expression<Func<'TDocument, bool>> * 
        ?options : DistinctOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<IAsyncCursor<'TField>> 
Parameters
- collection
- Type: MongoDB.DriverIMongoCollectionTDocument
 The collection.
- field
- Type: System.Linq.ExpressionsExpressionFuncTDocument, TField
 The field.
- filter
- Type: System.Linq.ExpressionsExpressionFuncTDocument, Boolean
 The filter.
- options (Optional)
- Type: MongoDB.DriverDistinctOptions
 The options.
- cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
 The cancellation token.
Type Parameters
- TDocument
- The type of the document.
- TField
- The type of the result.
Return Value
Type: 
TaskIAsyncCursorTField
            The distinct values for the specified field.
            
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type 
IMongoCollectionTDocument. 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