将程序升级到.net 4.5，将EntityFramework升级到最新版本并使用Autofac对应用程序进行一些调整之后，我遇到了以下问题：
该程序运行了几天后，突然会开始频繁报告：

System.Data.Entity.Core.EntityException: The underlying provider failed on Open. ---> System.InvalidCastException: Cannot cast an object of type "System.Data.SqlClient.SqlTransaction" to type "System.Transactions.Safeiunknown".。
   在 System.Transactions.Transaction.JitSafegetcontextTransaction(ContextData contextData)
   在 System.Transactions.Transaction.FastGetTransaction(TransactionScope currentScope,ContextData contextData,Transaction& contextTransaction)
   在 System.Transactions.Transaction.get_Current()
   在 System.Data.ProviderBase.DbConnectionPool.GetFromTransactedPool(Transaction& transaction)
   在 System.Data.ProviderBase.DbConnectionPool.Trygetconnection(DbConnection owningObject,UInt32 waitForMultipleObjectsTimeout,Boolean allowCreate,Boolean onlyOneCheckConnection,DbConnectionOptions userOptions,DbConnectionInternal& connection)
   在 System.Data.ProviderBase.DbConnectionPool.Trygetconnection(DbConnection owningObject,TaskCompletionSource`1 retry,DbConnectionInternal& connection)
   在 System.Data.ProviderBase.DbConnectionFactory.Trygetconnection(DbConnection owningConnection,DbConnectionInternal oldConnection,DbConnectionInternal& connection)
   在 System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection,DbConnectionFactory connectionFactory,DbConnectionOptions userOptions)
   在 System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   在 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   在 System.Data.SqlClient.SqlConnection.Open()
   在 System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext](TTarget target,action`2 operation,TInterceptionContext interceptionContext,action`3 executing,action`3 executed)
   在 System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection,DbInterceptionContext interceptionContext)
   在 System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.c__DisplayClass2_0.b__0()
   在 System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   在 System.Data.Entity.Core.EntityClient.EntityConnection.Open()

我认为这应该是由于将程序更改为依赖注入而引起的，但是我在Dbcontext创建和Dispose中创建了一个计数器，确认所有Dbcontext已经被处决，我不知道出了什么问题
这是我的连接字符串

Data Source=***; Initial Catalog=cloud; MultipleactiveResultSets=true; Pooling=True; UID=sa;PWD=***;

在某些地方，我使用交易，但是我很少使用它们。

public TransResult UseTrans(action<DbTransaction<TContext>> action)
        {
            if (currentTransHasError)
            {
                return new TransResult() { IsSuccess = false,Message = currentTransErrorMessage };
            }
            var result = new TransResult() { IsSuccess = true };
            bool isnested = true;
            try
            {

                if (currentContextTrans == null)
                {
                    isnested = false;
                    currentContextTrans = db.Database.BeginTransaction();
                }
                var trans = new DbTransaction<TContext>(this,isnested);
                action?.Invoke(trans);
                trans.Commit();

            }
            catch (Exception e)
            {

                result.Message = currentTransErrorMessage = e.Message;
                result.IsSuccess = false;
                currentTransHasError = true;
                if (currentContextTrans != null)
                {
                    currentContextTrans.Rollback();

                }

                // TODO: Handle failure
            }
            finally
            {
                if (!isnested)
                {
                    if (currentContextTrans != null)
                    {
                        currentContextTrans.Dispose();
                        currentContextTrans = null;
                    }
                    currentTransErrorMessage = string.Empty;
                    currentTransHasError = false;
                }
            }
            return result;

        }