Question

使用或理解wsdualhttpbinding WCF使用事务时遇到很大问题。

我有这样的事情：

IService：

[ServiceContract]
public interface IService
{
  //...
  [OperationContract]
  [ApplyDataContractResolver]
  [TransactionFlow(TransactionFlowOption.Mandatory)] 
  bool SaveDevice(Device device);
  //...
}

Service.svc.cs：

[ServiceBehavior(IncludeExceptionDetailInFaults = true)]
  public class Service : IService
  {
   [OperationBehavior(TransactionScopeRequired = true)]
   public bool SaveDevice(Device device)
   {
            bool temp = false;
            Transaction transaction = Transaction.Current;

            using (EntityConn context = new EntityConn())
            {
                try
                {
                  //....
                }
             }
    }
   }

Model.cs 所以我在我的客户端尝试执行带有事务要求的操作：

if (Transaction.Current.TransactionInformation.DistributedIdentifier == Guid.Empty)
        {
            using (var scope = new TransactionScope(TransactionScopeOption.Suppress))
            {
                try
                {
                   //do some stuff
                }
            }
          }

我正在收到错误：Transaction.Current为空

我是正确的吗？
什么时候不能解决？

感谢您的帮助

编辑：我只需要在使用

    using (var scope = new TransactionScope(TransactionScopeOption.Suppress))
    {
     if (Transaction.Current.TransactionInformation.DistributedIdentifier == Guid.Empty)
     {
            try
            {
               //do some stuff
            }
     }
    }

Answer 1

在TransactionScope之外，我认为Transaction.Current将始终为null。您需要先输入事务范围，然后开始访问Transaction.Current的属性。您似乎正在尝试在客户端执行某些非事务性操作？如果是这样，试试这个：

using (TransactionScope tran = new TransactionScope())
{
    if (Transaction.Current.TransactionInformation.DistributedIdentifier == Guid.Empty)
    {
        // ambient transaction is not escalated; exclude this operation from the ambient transaction
        using (TransactionScope tran2 = new TransactionScope(TransactionScopeOption.Suppress))
        {
            // do some stuff
        }
    }
    else
    {
        // ambient transaction is escalated
        // do some other stuff
    }
}

注意：我已经在示例代码中复制了条件，但是您应该验证这是正确的测试。在分布式交易之外，According to MSDN，TransactionInformation.DistributedIdentifier为null，而非Guid.Empty。

Answer 2

我认为您要在OperationBehavior属性上添加AutoEnlistTransaction = true。同样，您可能希望添加AutoCompleteTransaction = true。

客户端的交易

2 个答案: