webform1.aspx.cs

简单示例介绍DropDownList的高级用法

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace DropDownTest
{
	/// <summary>
	/// WebForm1 的摘要说明。
	/// </summary>
	public partial class WebForm1 : System.Web.UI.Page
	{
 
    
		protected void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.DynamicDropDown2.Request += new Yok.DynamicListEventHandler(this.DynamicDropDown2_Request);
			this.Dynamicdropdown4.Request += new Yok.DynamicListEventHandler(this.JustSplitTheWords);
			this.Dynamicdropdown3.Request += new Yok.DynamicListEventHandler(this.JustSplitTheWords);

		}
		#endregion

        protected void Button1_Click(object sender, System.EventArgs e) {
           Response.Write("text:" + DynamicDropDown2.Text + " value:" +DynamicDropDown2.Value);
        }

        private void DropDownList1_PreRender(object sender, System.EventArgs e) {
        
        }

        private void DynamicDropDown2_Request(object sender, Yok.DynamicListEventArgs e) {
            System.Collections.IDictionary destricts = (System.Collections.IDictionary)BuildTestDataSource()[e.Param];
            if (destricts != null)
                foreach (System.Collections.DictionaryEntry de in destricts) {
                    ((Yok.DynamicDropDown)sender).AddItem((string)de.Key, (string)de.Value);
                }
           
        }
        System.Collections.Hashtable BuildTestDataSource() {
            System.Collections.Hashtable ht = new System.Collections.Hashtable();
            System.Collections.Hashtable gz = new System.Collections.Hashtable();
            gz.Add("越秀", "yx");
            gz.Add("东山", "ds");
            gz.Add("白云", "by");
            gz.Add("天河", "th");
            gz.Add("芳村", "fc");
            gz.Add("海珠", "hz");
            ht.Add("广州", gz);
            System.Collections.Hashtable fs = new System.Collections.Hashtable();
            fs.Add("禅城", "cc");
            fs.Add("南海", "nh");
            fs.Add("顺德", "sd");
            fs.Add("高明", "gm");
            fs.Add("三水", "ss");
            ht.Add("佛山", fs);
            return ht;
        }

        private void JustSplitTheWords(object sender, Yok.DynamicListEventArgs e) {
            for (int i = 0; i < e.Param.Length; i++)
            ((Yok.DynamicDropDown)sender).AddItem(e.Param[i].ToString(), e.Param[i].ToString());
        
        }

	}
}