下拉列表框(dropdownlist)幾種綁定數(shù)據(jù)方式

1、未綁定狀態(tài)Deaiilt.B spx 起始頁DrapD oviiList 任筠甘慳卻堪海編輯項， 啟用 iutoFjLtBack綁定方式1單擊“確信”完成列表項的添加看至U default.aspx 代碼如下： 練習 1abcde運行看到：者賽習】綁定方式2：用Dropdownlist1的items集合的Add方式添加項數(shù)據(jù)在確信按鈕的單擊事件中添加如下代碼：protected void Button1_Click(object sender, EventArgs e)this.DropDownList1.Items.Add(new ListItem(11);this.DropDownList

2、1.Items.Add(new ListItem(22);this.DropDownList1.Items.Add(new ListItem(33);this.DropDownList1.Items.Add(new ListItem(44);this.DropDownList1.Items.Add(new ListItem(55);如此 default.aspx.cs 中的代碼如下：using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using

3、System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;protected void Page_Load(object sender, EventArgs e)protected void Button1_Click(object sender, EventArgs e)this.DropDownList1.Items.Add(new ListItem(11);this.DropDownList1.Items.A

4、dd(new ListItem(33);this.DropDownList1.Items.Add(new ListItem(44);this.DropDownList1.Items.Add(new ListItem(55);運行并單擊“確信”按鈕后，發(fā)覺列表框中多了 11,22,33,44,55 :巷建故I確定Ib c d e1122334455綁定方式3:先引入命名空間using System.collections;后概念一個動態(tài)數(shù)組：arraylist su=new arraylist();接著用su.Add(aa);給數(shù)組添加數(shù)據(jù)，最后用this.dropdownlist1.datas

5、ource=su;this.dropdownlist1.databind();把數(shù)組數(shù)據(jù)綁定到下拉列表框中default.aspx.cs代碼變成如下：using System;using System.Data;using System.Configuration;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.HtmlControl

6、s;using System.Collections;protected void Page_Load(object sender, EventArgs e)protected void Button1_Click(object sender, EventArgs e)this.DropDownList1.Items.Add(new ListItem(11);this.DropDownList1.Items.Add(new ListItem(22);this.DropDownList1.Items.Add(new ListItem(33);this.DropDownList1.Items.Ad

7、d(new ListItem(44);this.DropDownList1.Items.Add(new ListItem(55);ArrayList su = new ArrayList();su.Add(aa);su.Add(bb);su.Add(cc);su.Add(dd);su.Add(ee);this.DropDownList1.DataSource = su;this.DropDownList1.DataBind();運行并單擊“確信”后看到如下：密隨與1在設(shè)計視圖中添加一個文本框，實現(xiàn)：當咱們在下拉列表框當選擇某個索引項時, 立刻在文本框中顯示的功能要實現(xiàn)如此的功能得先設(shè)置效勞器回

8、發(fā)為真（即autopostback為true ）,能夠在屬性中找到該屬性并設(shè)置然后雙擊下拉列表控件，在其中輸入代碼:Default. crs Defivlt, 起蛤頁雙擊下拉列表控件protected void DropDownList1_SelectedIndexChanged(object sender,EventArgs e)this.TextBox1.Text = this.DropDownList1.SelectedValue;這時default.aspx.cs 代碼變成如下：using System;using System.Data;using System.Configurat

9、ion;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.Collections;protected void Page_Load(object sender, EventArgs e) protected void Button1_Click(object sender, Event

10、Args e) this.DropDownList1.Items.Add(new ListItem(11);this.DropDownList1.Items.Add(new ListItem(22);this.DropDownList1.Items.Add(new ListItem(33);this.DropDownList1.Items.Add(new ListItem(44);this.DropDownList1.Items.Add(new ListItem(55);ArrayList su = new ArrayList();su.Add(aa);su.Add(bb);su.Add(cc);su.Add(dd);su.Add(ee);this.DropDownList1.DataSource = su;this.DropDownList1.DataBind();protected void