DropDownList.SelectedIndex 属性

定义

获取或设置 DropDownList 控件中的选定项的索引。

public:
 virtual property int SelectedIndex { int get(); void set(int value); };
public override int SelectedIndex { get; set; }
member this.SelectedIndex : int with get, set
Public Overrides Property SelectedIndex As Integer

属性值

Int32

DropDownList 控件中的选定项的索引。 默认值为 0,该值选择列表中的第一项。

示例

下面的代码示例演示如何使用 SelectedIndex 属性来确定控件中的 DropDownList 选定项。

<%@ Page Language="C#" AutoEventWireup="True" %>

<!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" >
   <script runat="server" >
  
      void Selection_Change(Object sender, EventArgs e)
      {

         // Set the title format based on the value selected from the
         // DropDownList control. The SelectedIndex property can be used
         // to determine an enumeration value. Simply cast the value to 
         // the appropriate enumeration type. Note that the value might
         // need to be adjusted if the enumeration type is not zero-based. 
         Calendar1.TitleFormat = (TitleFormat)ModeList.SelectedIndex;

      }
  
   </script>
  
<head runat="server">
    <title> DropDownList SelectedIndex Example </title>
</head>
<body>

   <form id="form1" runat="server">
  
      <h3> DropDownList SelectedIndex Example </h3>

      Choose the title format.

      <br /><br /> 
  
      <asp:Calendar id="Calendar1"
           ShowGridLines="True" 
           ShowTitle="True"
           runat="server"/>

      <br /><br />

      <table cellpadding="5">

         <tr>

            <td>

               Format:

            </td>

         </tr>

         <tr>

            <td>

               <asp:DropDownList id="ModeList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem> Month </asp:ListItem>
                  <asp:ListItem Selected="True"> MonthYear </asp:ListItem>

               </asp:DropDownList>

            </td>

         </tr>
         
      </table>   
  
   </form>

</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>

<!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" >
   <script runat="server" >
  
      Sub Selection_Change(sender As Object, e As EventArgs)
      
         ' Set the title format based on the value selected from the
         ' DropDownList control. The SelectedIndex property can be used
         ' to determine an enumeration value. Simply cast the value to 
         ' the appropriate enumeration type. Note that the value might
         ' need to be adjusted if the enumeration type is not zero-based.
         Calendar1.TitleFormat = CType(ModeList.SelectedIndex, TitleFormat)

      End Sub
  
   </script>
  
<head runat="server">
    <title> DropDownList SelectedIndex Example </title>
</head>
<body>

   <form id="form1" runat="server">
  
      <h3> DropDownList SelectedIndex Example </h3>

      Choose the title format.

      <br /><br /> 
  
      <asp:Calendar id="Calendar1"
           ShowGridLines="True" 
           ShowTitle="True"
           runat="server"/>

      <br /><br />

      <table cellpadding="5">

         <tr>

            <td>

               Format:

            </td>

         </tr>

         <tr>

            <td>

               <asp:DropDownList id="ModeList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem> Month </asp:ListItem>
                  <asp:ListItem Selected="True"> MonthYear </asp:ListItem>

               </asp:DropDownList>

            </td>

         </tr>
         
      </table>   
  
   </form>

</body>
</html>

注解

SelectedIndex使用属性以编程方式指定或确定控件中DropDownList所选项的索引。 控件中 DropDownList 始终选择项。 不能同时清除列表中的每一个项目的选择。

备注

控件中 DropDownList 项的索引从零开始。

适用于

另请参阅