Windows Communication Foundation (WCF) 應用程式可以從用戶端內起始交易,並協調服務作業內的交易。 用戶端可以起始交易並叫用數個服務作業,並確保服務作業已認可或回復為單一單位。
您可以透過指定ServiceBehaviorAttribute,並為需要用戶端交易的服務作業設定其TransactionIsolationLevel和TransactionScopeRequired屬性,以在服務合約中啟用交易行為。 參數 TransactionAutoComplete 指定該方法執行的交易,如果沒有擲回未處理的例外狀況,是否會自動完成。 如需這些屬性的詳細資訊,請參閱 ServiceModel 交易屬性。
在服務作業中執行的工作,並由資源管理員管理,例如記錄資料庫更新,是用戶端交易的一部分。
下列範例展示了如何使用 ServiceBehaviorAttribute 和 OperationBehaviorAttribute 屬性來控制伺服器端的交易行為。
[ServiceBehavior(TransactionIsolationLevel = System.Transactions.IsolationLevel.Serializable)]
public class CalculatorService: ICalculatorLog
{
[OperationBehavior(TransactionScopeRequired = true,
TransactionAutoComplete = true)]
public double Add(double n1, double n2)
{
recordToLog($"Added {n1} to {n2}");
return n1 + n2;
}
[OperationBehavior(TransactionScopeRequired = true,
TransactionAutoComplete = true)]
public double Subtract(double n1, double n2)
{
recordToLog($"Subtracted {n1} from {n2}");
return n1 - n2;
}
[OperationBehavior(TransactionScopeRequired = true,
TransactionAutoComplete = true)]
public double Multiply(double n1, double n2)
{
recordToLog($"Multiplied {n1} by {n2}");
return n1 * n2;
}
[OperationBehavior(TransactionScopeRequired = true,
TransactionAutoComplete = true)]
public double Divide(double n1, double n2)
{
recordToLog($"Divided {n1} by {n2}", n1, n2);
return n1 / n2;
}
}
您可以將用戶端和服務綁定設定為使用 WS-AtomicTransaction 協議,並將<transactionFlow>元素設true為啟用交易和交易流程,如下列範例設定所示。
<client>
<endpoint address="net.tcp://localhost/ServiceModelSamples/service"
binding="netTcpBinding"
bindingConfiguration="netTcpBindingWSAT"
contract="Microsoft.ServiceModel.Samples.ICalculatorLog" />
</client>
<bindings>
<netTcpBinding>
<binding name="netTcpBindingWSAT"
transactionFlow="true"
transactionProtocol="WSAtomicTransactionOctober2004" />
</netTcpBinding>
</bindings>
客戶可以在交易範圍內建立 TransactionScope 並叫用服務作業,以開始交易。
using (TransactionScope ts = new TransactionScope(TransactionScopeOption.RequiresNew))
{
//Do work here
ts.Complete();
}