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: 2.20.0+ee01960089f28ea1b501690df5fc9f6318a70242
Syntax public 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