winform 项目删除sql server事务问题

Question

当我点击删除时报下面错误，是什么意思？ 怎么解决？项目是winform 数据库是sql server

如果分配给命令的连接位于本地挂起事务中，ExecuteReader 要求命令拥有事务。命令的 Transaction 属性尚未初始化。

事务部分代码
bool isSucess = false;
using (DbBase DbContext = new DbBase(connectionName))
{
using (IDbTransaction tran = DbContext.DbTransaction)
{
try
{
var query = new DapperExQuery().AndWhere(item => item.S_CODE,
OperationMethod.Equal, param.S_CODE);//根据店铺code查询所有采购回复信息
var replyQuery = query.GetSqlQuery(DbContext);
T_PRODUCT_REPLY entity = DbContext.SingleOrDefault(replyQuery, tran);
if (entity != null)
{
isSucess = DbContext.Delete(replyQuery, tran);
if (isSucess)
{
var purchaseQuery =
new DapperExQuery().AndWhere(item => item.PP_CODE,
OperationMethod.Equal, entity.PP_CODE);//根据采购PP_CODE查询采购信息
var purchaseSqlQuery = purchaseQuery.GetSqlQuery(DbContext);

                            T_PRODUCT_PURCHASE pEntity =
                                DbContext.SingleOrDefault<T_PRODUCT_PURCHASE>(purchaseSqlQuery, tran);
                            if (pEntity != null)
                            {
                                isSucess = DbContext.Delete<T_PRODUCT_PURCHASE>(purchaseSqlQuery, tran);
                            }
                        }
                    }
                    else
                    {
                        isSucess = true;
                    }

                    if (isSucess)
                    {

                    }
                }
                catch (Exception e)
                {
                    isSucess = false;
                    throw e;
                }
                finally
                {
                    if (isSucess)
                    {
                        tran.Commit();
                    }
                    else
                    {
                        tran.Rollback();
                    }
                }
            }
            return isSucess;
        }