webform1.aspx.cs

C#2005 实例源代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            InitData();
        }
    }

    /// <summary>
    /// 把数据装入一个Hashtable中
    /// </summary>
    /// <returns></returns>
    private Hashtable GetHashTable()
    {
        //连接数据库
        SqlConnection myCon = new SqlConnection();
        myCon.ConnectionString = "Persist Security Info=False;User id=sa;pwd=sa;database=northwind;server=(local)";
        myCon.Open();

        //使用SqlCommand提交查询命令
        SqlCommand selectCMD = new SqlCommand("SELECT CategoryID,CategoryName FROM Categories", myCon);

        //获取数据适配器
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = selectCMD;

        //创建 SqlDataReader
        SqlDataReader dr = selectCMD.ExecuteReader();

        //循环将dr中的内容过滤，然后放入HashTable中
        Hashtable ht = new Hashtable();
        while (dr.Read())
        {
            //筛选:过滤掉所有CategoryName值以C开头的数据
            string strKey = dr.GetSqlValue(0).ToString();		//CategoryID
            string strValue = dr.GetSqlValue(1).ToString();	//CategoryName
            if (strValue.StartsWith("C"))
                continue;
            //添加到Hashtalbe中
            ht.Add(strKey, strValue);
        }

        //断开连接
        myCon.Close();
        return ht;
    }

    /// <summary>
    /// 把SQLServer示例数据库：NorthWind，表Categories中的数据绑定到RadioButtonList1
    /// </summary>
    private void InitData()
    {
        //逐一处理Hashtable中每一项，手工绑定到RadioButtonList1
        Hashtable ht = this.GetHashTable();
        foreach (DictionaryEntry de in ht)
        {
            ListItem item = new ListItem(de.Value.ToString(), de.Key.ToString());
            RadioButtonList1.Items.Add(item);
        }
    }
}