System.InvalidOperationException:This.NpgsqlTransaction has completed;it is no longer usable. at Npg

Posted 2022-09-02 personblog

　关于报此异常，原因是事务不能循环提交，一个方法中事务只能提交一次。

System.InvalidOperationException:This.NpgsqlTransaction has completed;it is no longer usable. at Npgsql.NpgsqlTransaction.CheckCompleted() in ...

  正确使用方法

 using (var pay = _postgreDbContext.Database.BeginTransaction())
            
                try
                
                    billItem.review_remark = "通过";
                    foreach (var item in Settlement)
                    
                        item.status = 2;
                    
                    _postgreDbContext.SaveChanges();
                    pay.Commit();//注意放到循环外面

                
                catch (Exception ex)
                
                    throw ex;