Question

我有一个客户端调用一对Web服务方法作为TransactionScope的一部分。第一种服务方法作为自己的TransactionScope的一部分做了几件事。如果第一个方法的内部TransactionScope未完成（即从不调用scope.Complete（）），则无论服务方法实际返回什么，Web服务方法都会抛出ProtocolException。这是完整的异常消息（真实对象名称被混淆以匹配下面的示例）：

System.ServiceModel.ProtocolException: The transaction under which this method call was executing was asynchronously aborted.

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at TransactionScopeExperiment.Service1WCF.IService1.ServiceRequest(ServiceRequest request)
   at TransactionScopeExperiment.Service1WCF.Service1ServiceClient.ServiceMethod1(ServiceRequest request) in d:\vs-projects\TransactionScopeExperiment\TransactionScopeExperiment\Service References\Service1WCF\Reference.cs:line 1204
   at TransactionScopeExperiment.Program.CallAddMethod() in d:\vs-projects\TransactionScopeExperiment\TransactionScopeExperiment\Program.cs:line 60
   at TransactionScopeExperiment.Program.RunWithTransactionScope() in d:\vs-projects\TransactionScopeExperiment\TransactionScopeExperiment\Program.cs:line 81

我的服务看起来像这样

[ServiceBehavior(TransactionIsolationLevel = IsolationLevel.Serializable, TransactionTimeout = "00:01:00")]
[WebService(Namespace = "http://www.demo.com")]
public class Service1 : IService1
{
    [TransactionFlow(TransactionFlowOption.Allowed)]
    [OperationBehavior(TransactionScopeRequired = true)]
    public ServiceResponse ServiceMethod1(ServiceRequest request)
    {
        try
        {
            using (var scope = new TransactionScope())
            {
                // first SQL insert
                // second SQL insert fails and throws exception
                scope.Complete();
            }
        }
        catch (Exception ex)
        {
            return new ServiceResponse(error: ex.Message);
        }
    }
}

[ServiceContract]
public interface IService1
{
    [OperationContract]
    ServiceResponse ServiceMethod1(ServiceRequest request);
}

<bindings>
    <wsHttpBinding>
        <binding name="WSHttpBinding_IService1" transactionFlow="true">
            <security mode="None" />
        </binding>
    </wsHttpBinding>
</bindings>

为什么ServiceMethod1抛出ProtocolException而不是返回我的错误ServiceResponse对象？我如何获得我的回复对象？

当内部TransactionScope被中止时，为什么WCF方法会抛出ProtocolException？

0 个答案: