其ExecuteReader的参数是(CommandType commandType, string commandText, params SqlParameter[] commandParameters)

然后我想用它创建一个SqlDatareader对象

我是这么写的
SqlDataReader dr = DAL.NewSqlHelper.ExecuteReader(CommandType.Text, sql2, paras);

没有报错但是一运行就不对了，提示dr一直都为空,在while(dr.Read())处就出错了

这是NewSqlHelper.ExecuteReader的代码

public static SqlDataReader ExecuteReader(CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (constring == null || constring.Length == 0) throw new ArgumentNullException("connectionString");
            SqlConnection connection = null;
            try
            {
                connection = new SqlConnection(constring);
                connection.Open();
                return SqlHelper.ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                // If we fail to return the SqlDatReader, we need to close the connection ourselves
                if (connection != null) connection.Close();
                throw;
            }

        }
是底层方法跳转除了点错