数据层执行存储过程的方法，内部含有输出参数

public DataTable ProcGetPagedData(string procName, int pageIndex, int pageSize, out int pageCount, out int rowCount)
        {
            SqlConnection conn = new SqlConnection(connStr);
            pageCount = 0;
            rowCount = 0;
            SqlDataAdapter sda = new SqlDataAdapter(procName, conn);
            SqlParameter[] paras = new SqlParameter[]{
                    new SqlParameter("@pi",pageIndex),
                    new SqlParameter("@ps",pageSize),
                    new SqlParameter("@pc",pageCount),
                    new SqlParameter("@rc",rowCount)
            };
            paras[2].Direction = ParameterDirection.Output;
            paras[3].Direction = ParameterDirection.Output;
            sda.SelectCommand.Parameters.AddRange(paras);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            DataTable dt = new DataTable();
            sda.Fill(dt);
            pageCount = Convert.ToInt32(paras[2].Value);    //接收存储过程的输出参数值
            rowCount = Convert.ToInt32(paras[3].Value);
            return dt;
        }