1. selectedIndex——指的是dropdownlist中选项的索引，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：.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="dropdown.aspx.cs" Inherits="dropdown" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>无标题页</title> </head> <body> <form id="form1" runat="server"> <div> <asp:DropDownList ID="DropDownList1" runat="server"> <asp:ListItem Value="1">北京</asp:ListItem> <asp:ListItem Value="2">上海</asp:ListItem> <asp:ListItem Value="3">广州</asp:ListItem> </asp:DropDownList> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="check" /><br /> <asp:Label ID="Label1" runat="server" Text=""></asp:Label> <br /> <asp:Label ID="Label2" runat="server" Text=""></asp:Label> <br /> <asp:Label ID="Label3" runat="server" Text=""></asp:Label><br /> <asp:Label ID="Label4" runat="server" Text=""></asp:Label> <br /> <asp:Label ID="Label5" runat="server" 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; } }
原文
转载于:https://www.cnblogs.com/ZkbFighting/p/9469267.html
相关资源：数据结构—成绩单生成器