c# - sqlite事务c#中的异常

Question

我尝试了一切，但总是在“com.Transaction = trx;”处返回 System.NullreferencesException

   public override int ExecuteNonQuery(string query)
    {

        int register=0;
        SQLiteTransaction trx=null;
        SQLiteCommand com;
        try
        {
            if (this.IsClosed()) this.Open();

                trx = con.BeginTransaction();
                com = new SQLiteCommand(query, con);
                com.Transaction = trx;
                register = com.ExecuteNonQuery();
                trx.Commit();

            return register;
        }
        catch (SQLiteException ex)
        {
            trx.Rollback();//se tiene q deshaser toda la trransaccion hecha
            throw ex;
        }

        finally
        {
            this.Close();
        }

    }

我不知道我的错误在哪里:(

这是让我陷入交易的异常

更新：

这是异常细节

Answer 1

我修复了它，问题出在交易上，我认为 sqlite 不支持它，我评论了它，一切都像魅力一样。

  public override int ExecuteNonQuery(string query)
    {

        int register=0;
        //SQLiteTransaction trx=null;
        SQLiteCommand com;
        try
        {
            if (con.State == ConnectionState.Closed) this.Open();

                //trx = con.BeginTransaction();//para hacer transaciones para que la base de datos este estable
                com = new SQLiteCommand(query, con);
                //com.Transaction = trx;
                register = com.ExecuteNonQuery();//recien hacemos la coneccion en esta linea
               // trx.Commit();

            return register;
        }
        catch (SQLiteException ex)
        {
           // trx.Rollback();//se tiene q deshaser toda la trransaccion hecha
            throw ex;
        }

        finally
        {
            this.Close();
        }

    }

Answer 2

尝试替换这些行

 if (this.IsClosed()) 
      this.Open();

和

 if (con.State == ConnectionState.Closed) 
     con.Open();