WCF + TransactionScopeRequired + async + throw fault => ProtocolException "transaction under which method was executing was asynchronously aborted"

Question

在使用异步主机实现（在我的例子中使用任务）并异步抛出异常（即从延续）的服务上调用标有 "TransactionScopeRequired = true" 的 WCF 操作，似乎总是导致客户端收到以下异常（而不是我抛出的异常）：

System.AggregateException: One or more errors occurred. ---> System.ServiceModel.ProtocolException: The transaction under which this method call was executing was asynchronously aborted.
   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.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass6_0.<CreateTask>b__0(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at WcfTransactionScopeRequiredAsync.Program.Main(String[] args) in D:\WcfTransactionScopeRequiredAsync\WcfTransactionScopeRequiredAsync.Client\Program.cs:line 19
---> (Inner Exception #0) System.ServiceModel.ProtocolException: The transaction under which this method call was executing was asynchronously aborted.
   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.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass6_0.<CreateTask>b__0(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)<---

服务合同：

[ServiceContract]
public interface IService
{
    [FaultContract(typeof(SomeFault))]
    [TransactionFlow(TransactionFlowOption.Allowed)]
    [OperationContract]
    Task DoItAsync();
}

服务主机实现：

[OperationBehavior(TransactionScopeRequired = true)]
public async Task DoItAsync()
{
    using (TransactionScope tx = new TransactionScope(TransactionScopeOption.Required, TransactionScopeAsyncFlowOption.Enabled))
    {
        await Task.Delay(1000).ConfigureAwait(continueOnCapturedContext: false);
        throw new FaultException<SomeFault>(new SomeFault());
        tx.Complete();
    }
}

客户端是同步的：

service.DoItAsync().Wait();

客户端在这种情况下不流转事务（所以这肯定不是分布式事务（通过检查Transaction.Current.TransactionInformation.DistributedIdentifier验证）。

此代码已使用 .NET Framework 4.7.2 进行测试。

到目前为止，我的研究表明此 ProtocolException 是由服务主机上的 WCF 管道抛出的（从异常中的堆栈跟踪中也可以看出），并且据推测是为了处理在主机的外部中止的分布式事务控制（即当 DTC 发出中止时）。虽然这看起来有些道理，但这里显然不是这种情况。

有没有办法在主机上仍然使用异步实现的同时避免此 ProtocolException？

Answer 1

Is there any way to avoid this ProtocolException while still using an async implementation on the host?

看来您不应该在服务宿主实现中创建自己的 TransactionScope 实例，而应仅依赖于 WCF 管道创建的 TransactionScope。

我相应地调整了上面的服务主机实现代码并且 ProtocolException 消失了（我现在在客户端上得到了 FaultException）。

对 this post 的评论让我走上了正确的轨道。

WCF + TransactionScopeRequired + async + throw fault => ProtocolException "transaction under which method was executing was asynchronously aborted"

WCF + TransactionScopeRequired + async + throw fault => ProtocolException "transaction under which method was executing was asynchronously aborted"

c#

wcf

transactionscope

protocolexception

async-await