DataSet之将连个DataSet集合合并成一个DataSet集合

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace qqIsonline
{
    public partial class index1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack){
                GridView1.DataSource = GetQQinfo();
                GridView1.DataBind();
                GridView2.DataSource = GetorderInfo();
                GridView2.DataBind();
                GridView3.DataSource = GetDataByCount();
                GridView3.DataBind();
            }
            
        }
        string sqlConnStr = ConfigurationManager.ConnectionStrings["myDB"].ToString();

        //获得QQ信息
        public DataSet GetQQinfo()
        {
           using(SqlConnection sqlConn = new SqlConnection(sqlConnStr)){
               string sqlStr = "select * from qqinfo";
               SqlDataAdapter sda = new SqlDataAdapter(sqlStr,sqlConn);
               DataSet ds = new DataSet();
               sda.Fill(ds);
               return ds;
           }
        }

        //获得订单中每个扣扣号出现的总数
        public DataSet GetorderInfo()
        {
            using (SqlConnection sqlConn = new SqlConnection(sqlConnStr))
            {
                string sqlStr = "select COUNT(orderinfo.Id) as num,QQ from orderinfo group by QQ order by num Desc";
                SqlDataAdapter sda = new SqlDataAdapter(sqlStr, sqlConn);
                DataSet ds = new DataSet();
                sda.Fill(ds);
                return ds;
            }
        }

        /// <summary>
        /// 将两个DataSet中的数据整合
        /// 将每个客服对应的订单量追加到DataTable后面
        /// </summary>
        /// <returns>一个新的集合</returns>
        public DataTable GetDataByCount()
        {
            DataSet dtordet = GetorderInfo();     //每个客服订单量汇总的集合
            DataSet dtqq = GetQQinfo();           //客服数据集合
            dtqq.Tables[0].Columns.Add("colunm", typeof(string));    //给客服集合新增一列
            for (int i = 0; i < dtordet.Tables[0].Rows.Count; i++)   //遍历每个客服订单量汇总的集合
            {
                string qq = dtordet.Tables[0].Rows[i]["QQ"].ToString();   //获得该行的QQ号
                DataRow[] dr = dtqq.Tables[0].Select("QQ=" + qq);         //客服数据集合中是否包含有这个ID
                if (dr.Length.Equals(1))   //包含
                {
                    int k = dtqq.Tables[0].Rows.IndexOf(dr[0]);        //记录下该行数据的行号！
                    string num = dtordet.Tables[0].Rows[k]["num"].ToString();   //获得改行数据对应的订单数
                    dtqq.Tables[0].Rows[i]["colunm"] = num;   //添加列数据
                }
            }
            DataView dv = dtqq.Tables[0].DefaultView;
            dv.Sort="colunm DESC";   //对数据根据订单量进行降序排序
            return dv.ToTable();
        }
    }
}