求救 用MySqlDataAdapter.Update(DataTable)去批量插入数据时抛InvalidOperationException异常

            MySqlConnectionStringBuilder connectionStringBuilder = new MySqlConnectionStringBuilder();
            connectionStringBuilder.Server = "localhost";
            connectionStringBuilder.UserID = "root";
            connectionStringBuilder.Password = "111111";
            connectionStringBuilder.Database = "test";
            MySqlConnection connection = new MySqlConnection(connectionStringBuilder.ToString());
            connection.Open();

            MySqlCommand selectAllCommand = new MySqlCommand("Select * from student limit 1", connection);
            selectAllCommand.UpdatedRowSource = UpdateRowSource.None;
            MySqlDataAdapter dataAdapter = new MySqlDataAdapter(selectAllCommand);
            dataAdapter.UpdateBatchSize = 0;
            DataTable dbDataTable = new DataTable();
            int nn = dataAdapter.Fill(dbDataTable);
            MySqlCommandBuilder commandBuilder = new MySqlCommandBuilder(dataAdapter);
            dataAdapter.InsertCommand = commandBuilder.GetInsertCommand(true) as MySqlCommand;
            dataAdapter.DeleteCommand = commandBuilder.GetDeleteCommand();
            dataAdapter.UpdateCommand = commandBuilder.GetUpdateCommand(true) as MySqlCommand;

            for (int ii = 0; ii < 100; ii++)
            {
                DataRow dataRow = dbDataTable.NewRow();
                dataRow["name"] = "zhangsan";
                dataRow["age"] = 10;
                dataRow["spec"] = "gongren";
                dbDataTable.Rows.Add(dataRow);
            }
            int n = dataAdapter.Update(dbDataTable);
            connection.Close();

异常信息是： When batching, the command's UpdatedRowSource property value of UpdateRowSource.FirstReturnedRecord or UpdateRowSource.Both is invalid.

但执行update之前，我明明把所有的UpdatedRowSource设置了None的啊，但运行Update时却把InsertCommand的UpdateRowSource改成FirstReturnedRecord

哪位高人知道，请教请教？？ --------------------编程问答-------------------- 有人高人在吗？ --------------------编程问答-------------------- 建议转发到相应语言版 --------------------编程问答-------------------- 有人用过吗？ --------------------编程问答-------------------- dataAdapter.InsertCommand .UpdatedRowSource = UpdateRowSource.None;

补充：.NET技术 ,  C#