OperationContext.Current 屬性


取得或設定目前執行緒的執行內容。Gets or sets the execution context for the current thread.

 static property System::ServiceModel::OperationContext ^ Current { System::ServiceModel::OperationContext ^ get(); void set(System::ServiceModel::OperationContext ^ value); };
public static System.ServiceModel.OperationContext Current { get; set; }
member this.Current : System.ServiceModel.OperationContext with get, set
Public Shared Property Current As OperationContext



代表目前方法之訊息與執行內容的 OperationContextThe OperationContext that represents the messaging and execution context of the current method.


下列程式碼範例會使用 Current 屬性和 GetCallbackChannel 方法,從方法內建立通道傳回給呼叫者。The following code example uses the Current property and GetCallbackChannel method to create a channel back to the caller from within a method. 本範例的所有方法都是單向方法,可讓服務與用戶端獨立地進行雙向通訊。All methods in this example are one-way methods, enabling the service and the client to communicate in both directions independently. 在此情況下,範例用戶端應用程式在結束之前只需要一個傳回呼叫,但另一個用戶端(例如 Windows Forms 用戶端)可以從服務接收任意數目的呼叫。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.

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Threading;

namespace Microsoft.WCF.Documentation
    Name = "SampleDuplexHello",
    Namespace = "http://microsoft.wcf.documentation",
    CallbackContract = typeof(IHelloCallbackContract),
    SessionMode = SessionMode.Required
  public interface IDuplexHello
    [OperationContract(IsOneWay = true)]
    void Hello(string greeting);

  public interface IHelloCallbackContract
    [OperationContract(IsOneWay = true)]
    void Reply(string responseToGreeting);

  public class DuplexHello : IDuplexHello
    public DuplexHello()
      Console.WriteLine("Service object created: " + this.GetHashCode().ToString());

      Console.WriteLine("Service object destroyed: " + this.GetHashCode().ToString());

    public void Hello(string greeting)
      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.
      IHelloCallbackContract callerProxy
        = OperationContext.Current.GetCallbackChannel<IHelloCallbackContract>();
      string response = "Service object " + this.GetHashCode().ToString() + " received: " + greeting;
      Console.WriteLine("Sending back: " + response);

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


Current 可以使用屬性來取得目前方法的執行和訊息內容。Use the Current property to obtain the execution and message context for the current method.