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OperationContext.Current Property

Gets or sets the execution context for the current thread.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

Public Shared Property Current As OperationContext

Property Value

Type: System.ServiceModel.OperationContext
The OperationContext that represents the messaging and execution context of the current method.

Use the Current property to obtain the execution and message context for the current method.

The following code example uses the Current property and GetCallbackChannel(Of T) method to create a channel back to the caller from within a method. All methods in this example are one-way methods, enabling the service and the client to communicate in both directions independently. In this case, the example client application expects only one return call before it exits, but another client, for example a Windows Forms client, can receive any number of calls from the service.

Imports System
Imports System.Collections.Generic
Imports System.ServiceModel
Imports System.Threading

Namespace Microsoft.WCF.Documentation
    <ServiceContract(Name:="SampleDuplexHello", Namespace:="http://microsoft.wcf.documentation", _
                     CallbackContract:=GetType(IHelloCallbackContract), SessionMode:=SessionMode.Required)> _
  Public Interface IDuplexHello
        <OperationContract(IsOneWay:=True)> _
        Sub Hello(ByVal greeting As String)
    End Interface

  Public Interface IHelloCallbackContract
	<OperationContract(IsOneWay := True)> _
	Sub Reply(ByVal responseToGreeting As String)
  End Interface

  Public Class DuplexHello
	  Implements IDuplexHello
	Public Sub New()
	  Console.WriteLine("Service object created: " & Me.GetHashCode().ToString())
	End Sub

	Protected Overrides Sub Finalize()
	  Console.WriteLine("Service object destroyed: " & Me.GetHashCode().ToString())
	End Sub

	Public Sub Hello(ByVal greeting As String) Implements IDuplexHello.Hello
	  Console.WriteLine("Caller sent: " & greeting)
	  Console.WriteLine("Session ID: " & OperationContext.Current.SessionId)
	  Console.WriteLine("Waiting two seconds before returning call.")
	  ' Put a slight delay to demonstrate asynchronous behavior on client.
            Dim callerProxy = OperationContext.Current.GetCallbackChannel(Of IHelloCallbackContract)()
            Dim response = "Service object " & Me.GetHashCode().ToString() & " received: " & greeting
	  Console.WriteLine("Sending back: " & response)
	End Sub
  End Class
End Namespace

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.