轉自http://blog.csdn.net/iqv520/article/details/4419186
1. selectedIndex——指的是dropdownlist中選項的索引，為int，從0開始，可讀可寫
2. selectedItem——指的是選中的dropdownlist中選項，為ListItem，只讀不寫
3. selectedValue——指的是選中的dropdownlist中選項的值，為string， 只讀不寫
4. selectedItem.Text——指的是選中的dropdownlist中選項的文本內容，與selectedItems的值一樣為string，可讀可寫
5. selectedItem.value——指的是選中的dropdownlist中選項的值，與selectedValue的值一樣，為string，可讀可寫
光看文字可能不太理解，我也是通過程序來加深理解的，下面舉個例子：
前台代碼：
- <%@ 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>無標題頁</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">廣州</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>
后台代碼：
- 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;
- }
- }
運行效果如下：
本文轉自http://blog.csdn.net/iqv520/article/details/4419186
