珠海网站建设搭建,宁波网站建,wordpress说说,健网站怎样建1. selectedIndex——指的是dropdownlist中选项的索引#xff0c;为int#xff0c;从0开始#xff0c;可读可写 2. selectedItem——指的是选中的dropdownlist中选项#xff0c;为ListItem#xff0c;只读不写 3. selectedValue——指的是选中的dropdownlist中选项的值为int从0开始可读可写 2. selectedItem——指的是选中的dropdownlist中选项为ListItem只读不写 3. selectedValue——指的是选中的dropdownlist中选项的值为string 只读不写 4. selectedItem.Text——指的是选中的dropdownlist中选项的文本内容与selectedItems的值一样为string可读可写 5. selectedItem.value——指的是选中的dropdownlist中选项的值与selectedValue的值一样为string可读可写 光看文字可能不太理解我也是通过程序来加深理解的下面举个例子
前台代码
% Page LanguageC# AutoEventWireuptrue CodeFiledropdown.aspx.cs Inheritsdropdown %!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtdhtml xmlnshttp://www.w3.org/1999/xhtml
head runatservertitle无标题页/title
/head
bodyform idform1 runatserverdivasp:DropDownList IDDropDownList1 runatserverasp:ListItem Value1北京/asp:ListItemasp:ListItem Value2上海/asp:ListItemasp:ListItem Value3广州/asp:ListItem/asp:DropDownListasp:Button IDButton1 runatserver OnClickButton1_Click Textcheck /br /asp:Label IDLabel1 runatserver Text/asp:Labelbr /asp:Label IDLabel2 runatserver Text/asp:Labelbr /asp:Label IDLabel3 runatserver Text/asp:Labelbr /asp:Label IDLabel4 runatserver Text/asp:Labelbr /asp:Label IDLabel5 runatserver Text/asp:Label/div/form
/body
/html
后台代码
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;public partial class dropdown : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e){}protected void Button1_Click(object sender, EventArgs e){Label1.Text selectedIndex DropDownList1.SelectedIndex;Label2.Text selectedItem DropDownList1.SelectedItem;Label3.Text selectedValue DropDownList1.SelectedValue;Label4.Text selectedItem.text DropDownList1.SelectedItem.Text;Label5.Text selectedItem.value DropDownList1.SelectedItem.Value;}
}
运行效果如下 https://blog.csdn.net/iqv520/article/details/4419186/?utm_mediumdistribute.pc_relevant_bbs_down.none-task-blog-baidujs-2.nonecasedepth_1-utm_sourcedistribute.pc_relevant_bbs_down.none-task-blog-baidujs-2.nonecase
