Dictionary应用

using System;
using System.Collections.Generic;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ProjectWeb
{
    public partial class DataSetTable : System.Web.UI.Page
    {
        //创建字典，好处就是使用ContainsKey功能
        private Dictionary<string, string> dicObject = new Dictionary<string, string>();

        protected void Page_Load(object sender, EventArgs e)
        {
            //把DataTable数据添加到Dictionary字典
            DataTable dt_sn = GetData().Tables[0];
            this.dicObject.Clear();
            foreach (DataRow dr in dt_sn.Rows)
                this.dicObject.Add(dr["id"].ToString(), dr["name"].ToString());

            //Dictionary字典的数据添加到页面DropDownList1
            this.DropDownList1.Items.Clear();
            this.DropDownList1.Items.Add(new ListItem("第一张表"," "));
            foreach (KeyValuePair<string, string> kv in dicObject)
                this.DropDownList1.Items.Add(new ListItem(kv.Value, kv.Key));

            //第二张表数据
            DataTable dt_te = GetData().Tables[1];
            this.DropDownList2.Items.Clear();
            this.DropDownList2.Items.Add(new ListItem("第二张表", " "));
            foreach (DataRow dr in dt_te.Rows)
                this.DropDownList2.Items.Add(new ListItem(dr["name"].ToString(), dr["id"].ToString()));
        }
        #region 返回数据集
        private DataSet GetData()
        {
            //创建第一张表
            DataTable dt_sn = new DataTable();
            //添加列
            dt_sn.Columns.Add("id");
            dt_sn.Columns.Add("name");
            //添加行
            DataRow dr_sn = dt_sn.NewRow();
            dr_sn["id"] = "1";
            dr_sn["name"] = "杨秀徐";
            dt_sn.Rows.Add(dr_sn);
            //表名称
            dt_sn.TableName = "SN";

            //创建第二张表
            DataTable dt_te = new DataTable();
            //添加列
            dt_te.Columns.Add("id");
            dt_te.Columns.Add("name");
            //添加行
            DataRow dr_te = dt_te.NewRow();
            dr_te["id"] = "2";
            dr_te["name"] = "杨四节";
            dt_te.Rows.Add(dr_te);
            //表名称
            dt_te.TableName = "Te";

            DataSet ds = new DataSet();
            //把表DataTable添加到数据集DataSet
            ds.Tables.Add(dt_sn);
            ds.Tables.Add(dt_te);

            return ds;
        }
        #endregion
    }
}