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IMongoCollectionExtensionsDistinctTDocument, 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: 2.2.0
Syntax
public static IAsyncCursor<TField> Distinct<TDocument, TField>(
	this IMongoCollection<TDocument> collection,
	Expression<Func<TDocument, TField>> field,
	Expression<Func<TDocument, bool>> filter,
	DistinctOptions options = null,
	CancellationToken cancellationToken = null
)

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: IAsyncCursorTField
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