WCFによるセキュアでリライアブルでトランザクティッドな分散アプリケーションの構築：Windows Communication Foundation概説（2/3 ページ）

// サービス・コントラクトの定義
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
public interface ICalculator
{
  [OperationContract]
  [TransactionFlow(TransactionFlowOption.Mandatory)]
  double Add(double n1, double n2);

  [OperationContract]
  [TransactionFlow(TransactionFlowOption.Mandatory)]
  double Subtract(double n1, double n2);
}

[ServiceBehavior(TransactionIsolationLevel = System.Transactions.IsolationLevel.Serializable)]
public class CalculatorService: ICalculator
{
  [OperationBehavior(TransactionScopeRequired = true,
                     TransactionAutoComplete = true)]
  public double Add(double n1, double n2)
  {
    recordToLog(String.Format("Added {0} to {1}", n1, n2));
    return n1 + n2;
  }

   [OperationBehavior(TransactionScopeRequired = true,
                      TransactionAutoComplete = true)]
  public double Subtract(double n1, double n2)
  {
    recordToLog(String.Format("Subtracted {0} from {1}", n1, n2));
    return n1 - n2;
  }

  // ログ追加用のPrivateメソッド
  private void recordToLog(string recordText)
  {
    string fullRecordText =
      recordText + " at " + DateTime.Now.TimeOfDay;

    using (SqlConnection conn = new SqlConnection(
             ConfigurationManager.AppSettings["connectionString"]))
    {
      SqlCommand cmd = new SqlCommand(
        "INSERT into Log (Entry) Values (@Entry)", conn);
      cmd.Parameters.AddWithValue("@Entry", fullRecordText);
      conn.Open();
      cmd.ExecuteNonQuery();
      Console.WriteLine("Writing to database: {0}", fullRecordText);
    }
  }
}

using (TransactionScope ts = new TransactionScope(
         TransactionScopeOption.RequiresNew))
{
  Console.WriteLine("Starting transaction");

  // Addサービス・オペレーションの呼び出し
  double value1 = 100.00D;
  double value2 = 15.99D;
  double result = proxy.Add(value1, value2);
  Console.WriteLine("  Add({0},{1}) = {2}", value1, value2, result);

  // Subtractサービス・オペレーションの呼び出し
  value1 = 145.00D;
  value2 = 76.54D;
  result = proxy.Subtract(value1, value2);
  Console.WriteLine("  Subtract({0},{1}) = {2}", value1, value2, result);

  Console.WriteLine("{0} transaction\n",
    commitTransaction ? "Committing" : "Rolling back");

  if (commitTransaction)
    ts.Complete();
  }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <client>
      <endpoint name=" Endpoint1"
                address="http://localhost:8000/ServiceModelSamples/service"
                binding="wsHttpBinding"
                bindingConfiguration="wsHttpBindingWSAT"
                contract="Microsoft.ServiceModel.Samples.ICalculatorLog" />
    </client>
    <bindings>
      <wsHttpBinding>
        <binding name="wsHttpBindingWSAT"
                 transactionFlow="true" />
      </wsHttpBinding>
    </bindings>
  </system.serviceModel>
</configuration>