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ExecuteDbDataReaderAsync Method

DbCommand.ExecuteDbDataReaderAsync Method

.NET Framework 4.6 and 4.5

Providers should implement this method to provide a non-default implementation for ExecuteReader overloads.

The default implementation invokes the synchronous ExecuteReader method and returns a completed task, blocking the calling thread. The default implementation will return a cancelled task if passed an already cancelled cancellation token. Exceptions thrown by ExecuteReader will be communicated via the returned Task Exception property.

This method accepts a cancellation token that can be used to request the operation to be cancelled early. Implementations may ignore this request.

Namespace:  System.Data.Common
Assembly:  System.Data (in System.Data.dll)

Protected Overridable Function ExecuteDbDataReaderAsync ( _
	behavior As CommandBehavior, _
	cancellationToken As CancellationToken _
) As Task(Of DbDataReader)


Type: System.Data.CommandBehavior

Options for statement execution and data retrieval.

Type: System.Threading.CancellationToken

The token to monitor for cancellation requests.

Return Value

Type: System.Threading.Tasks.Task(Of DbDataReader)
A task representing the asynchronous operation.


An error occurred while executing the command text.


An invalid CommandBehavior value.

For more information about asynchronous programming, see Asynchronous Programming.

.NET Framework

Supported in: 4.6, 4.5
© 2015 Microsoft