.NET事务的用法

 using (SqlTransaction st = conn.BeginTransaction(IsolationLevel.ReadUncommitted))

                    {

                        //cmd.Transaction = st;

                        try

                        {

                            cmd.ExecuteNonQuery();

                            st.Rollback();

                            conn.Close();

                        }

                        catch (SqlException sqlEx)

                        {

                            st.Rollback();

                            throw sqlEx;

                        }

                    }

在如上代码调试时，出现异常：

  异常提示：

+      [System.InvalidOperationException] {"如果分配给命令的连接位于本地挂起事务中，ExecuteNonQuery 要求命令拥有事务。命令的 Transaction 属性尚未初始化。"}    System.InvalidOperationException

后来，检查发现是缺少了上面代码中“cmd.Transaction = st;”一行。加上即可。