CallbackBehaviorAttribute.UseSynchronizationContext Properti

Definisi

Ruang nama:

System.ServiceModel

Rakitan:

System.ServiceModel.dll, System.ServiceModel.Primitives.dll

Paket:

System.ServiceModel.Primitives v10.0.652802

Sumber:

CallbackBehaviorAttribute.cs

Mendapatkan atau menetapkan nilai yang menentukan apakah akan menggunakan konteks sinkronisasi saat ini untuk memilih utas eksekusi.

public:
 property bool UseSynchronizationContext { bool get(); void set(bool value); };

public bool UseSynchronizationContext { get; set; }

member this.UseSynchronizationContext : bool with get, set

Public Property UseSynchronizationContext As Boolean

Nilai Properti

Boolean

true jika semua panggilan ke layanan harus berjalan pada utas yang ditentukan oleh SynchronizationContext; jika tidak, false. Nilai defaultnya adalah true.

Contoh

Contoh kode berikut menunjukkan CallbackBehaviorAttribute pada objek panggilan balik yang menggunakan objek untuk menentukan utas SynchronizationContext mana yang akan di-marshal, ValidateMustUnderstand properti untuk memberlakukan validasi pesan, dan IncludeExceptionDetailInFaults properti untuk mengembalikan pengecualian sebagai FaultException objek ke layanan untuk tujuan penelusuran kesalahan.

using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Threading;

namespace Microsoft.WCF.Documentation
{
  [CallbackBehaviorAttribute(
   IncludeExceptionDetailInFaults= true,
    UseSynchronizationContext=true,
    ValidateMustUnderstand=true
  )]
  public class Client : SampleDuplexHelloCallback
  {
    AutoResetEvent waitHandle;

    public Client()
    {
      waitHandle = new AutoResetEvent(false);
    }

    public void Run()
    {
      // Picks up configuration from the configuration file.
      SampleDuplexHelloClient wcfClient
        = new SampleDuplexHelloClient(new InstanceContext(this), "WSDualHttpBinding_SampleDuplexHello");
      try
      {
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine("Enter a greeting to send and press ENTER: ");
        Console.Write(">>> ");
        Console.ForegroundColor = ConsoleColor.Green;
        string greeting = Console.ReadLine();
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine("Called service with: \r\n\t" + greeting);
        wcfClient.Hello(greeting);
        Console.WriteLine("Execution passes service call and moves to the WaitHandle.");
        this.waitHandle.WaitOne();
        Console.ForegroundColor = ConsoleColor.Blue;
        Console.WriteLine("Set was called.");
        Console.Write("Press ");
        Console.ForegroundColor = ConsoleColor.Red;
        Console.Write("ENTER");
        Console.ForegroundColor = ConsoleColor.Blue;
        Console.Write(" to exit...");
        Console.ReadLine();
      }
      catch (TimeoutException timeProblem)
      {
        Console.WriteLine("The service operation timed out. " + timeProblem.Message);
        Console.ReadLine();
      }
      catch (CommunicationException commProblem)
      {
        Console.WriteLine("There was a communication problem. " + commProblem.Message);
        Console.ReadLine();
      }
    }
    public static void Main()
    {
      Client client = new Client();
      client.Run();
    }

    public void Reply(string response)
    {
      Console.WriteLine("Received output.");
      Console.WriteLine("\r\n\t" + response);
      this.waitHandle.Set();
    }
  }
}

Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.Threading

Namespace Microsoft.WCF.Documentation
  <CallbackBehaviorAttribute(IncludeExceptionDetailInFaults:= True, UseSynchronizationContext:=True, ValidateMustUnderstand:=True)> _
  Public Class Client
      Implements SampleDuplexHelloCallback
    Private waitHandle As AutoResetEvent

    Public Sub New()
      waitHandle = New AutoResetEvent(False)
    End Sub

    Public Sub Run()
      ' Picks up configuration from the configuration file.
      Dim wcfClient As New SampleDuplexHelloClient(New InstanceContext(Me), "WSDualHttpBinding_SampleDuplexHello")
      Try
        Console.ForegroundColor = ConsoleColor.White
        Console.WriteLine("Enter a greeting to send and press ENTER: ")
        Console.Write(">>> ")
        Console.ForegroundColor = ConsoleColor.Green
        Dim greeting As String = Console.ReadLine()
        Console.ForegroundColor = ConsoleColor.White
        Console.WriteLine("Called service with: " & Constants.vbCrLf & Constants.vbTab & greeting)
        wcfClient.Hello(greeting)
        Console.WriteLine("Execution passes service call and moves to the WaitHandle.")
        Me.waitHandle.WaitOne()
        Console.ForegroundColor = ConsoleColor.Blue
        Console.WriteLine("Set was called.")
        Console.Write("Press ")
        Console.ForegroundColor = ConsoleColor.Red
        Console.Write("ENTER")
        Console.ForegroundColor = ConsoleColor.Blue
        Console.Write(" to exit...")
        Console.ReadLine()
      Catch timeProblem As TimeoutException
        Console.WriteLine("The service operation timed out. " & timeProblem.Message)
        Console.ReadLine()
      Catch commProblem As CommunicationException
        Console.WriteLine("There was a communication problem. " & commProblem.Message)
        Console.ReadLine()
      End Try
    End Sub
    Public Shared Sub Main()
      Dim client As New Client()
      client.Run()
    End Sub

    Public Sub Reply(ByVal response As String) Implements SampleDuplexHelloCallback.Reply
      Console.WriteLine("Received output.")
      Console.WriteLine(Constants.vbCrLf & Constants.vbTab & response)
      Me.waitHandle.Set()
    End Sub
  End Class
End Namespace

Keterangan

Gunakan properti ini untuk menyediakan afinitas utas antarmuka pengguna yang diperlukan beberapa aplikasi. Misalnya, aplikasi Windows Forms dapat didaftarkan sebagai objek layanan singleton. Dalam hal ini, semua panggilan ke layanan harus berjalan pada utas Formulir Windows. Kasus default, di mana UseSynchronizationContext diatur ke true, menyinkronkan semua panggilan ke layanan untuk dijalankan pada utas antarmuka pengguna.

Perhatikan bahwa utas yang digunakan adalah utas sinkronisasi saat ini saat DuplexChannelFactory<TChannel>.CreateChannel atau DuplexClientBase<TChannel>.CreateChannel dipanggil. Dalam kasus aplikasi Windows Forms, ini berarti bahwa panggilan ini harus terjadi setelah panggilan ke Application.Run metode .