HtmlInputRadioButton.OnServerChange(EventArgs) 方法

參考

定義

命名空間:: System.Web.UI.HtmlControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

引發 ServerChange 事件。這允許您在事件引發時建立自訂事件處理常式。

protected:
 virtual void OnServerChange(EventArgs ^ e);

protected virtual void OnServerChange (EventArgs e);

abstract member OnServerChange : EventArgs -> unit
override this.OnServerChange : EventArgs -> unit

Protected Overridable Sub OnServerChange (e As EventArgs)

參數

e: EventArgs

EventArgs，其中包含事件資料。

範例

下列程式碼範例示範如何指定和撰寫 ServerChange 事件的處理常式程式碼。自訂事件處理常式會更新網頁上的標籤，以顯示所選選項按鈕的值。

<%@ 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" >
<head>
    <title>HtmlInputRadioButton Sample</title>
<script runat="server">

      void Server_Change(object sender, EventArgs e) 
      {
         if (Radio1.Checked)
            Span1.InnerHtml = "You selected " +
                              Radio1.Value;
         else if (Radio2.Checked)
            Span1.InnerHtml = "You selected " +
                              Radio2.Value;
         else if (Radio3.Checked)
            Span1.InnerHtml = "You selected " +
                              Radio3.Value;
      }
         

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3>HtmlInputRadioButton Sample</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode"
             value="Radio Button 1"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 1
      <br />

      <input type="radio" 
             id="Radio2" 
             name="Mode"
             value="Radio Button 2"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 2
      <br />

      <input type="radio" 
             id="Radio3" 
             name="Mode"
             value="Radio Button 3"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 3

      <br />

      <input type="submit" 
             id="Button1" 
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server" />

   </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" >
<head>
    <title>HtmlInputRadioButton Sample</title>
<script runat="server">

      Sub Server_Change(sender As Object , e As EventArgs) 
      
         If Radio1.Checked Then
            Span1.InnerHtml = "You selected " & _
                              Radio1.Value
         ElseIf Radio2.Checked Then
            Span1.InnerHtml = "You selected " & _
                              Radio2.Value
         ElseIf Radio3.Checked Then
            Span1.InnerHtml = "You selected " & _
                              Radio3.Value
         End If

      End Sub
         

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3>HtmlInputRadioButton Sample</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode"
             value="Radio Button 1"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 1
      <br />

      <input type="radio" 
             id="Radio2" 
             name="Mode"
             value="Radio Button 2"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 2
      <br />

      <input type="radio" 
             id="Radio3" 
             name="Mode"
             value="Radio Button 3"
             onserverchange="Server_Change" 
             runat="server"/>
      Option 3

      <br />

      <input type="submit" 
             id="Button1" 
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server"/>

   </form>

</body>
</html>


<%@ 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" >
<head>
    <title>HtmlInputRadioButton ServerChange Example</title>
<script runat="server">

      void Server_Change(object sender, EventArgs e) 
      {
         if (Radio1.Checked)
         {
            Span1.InnerHtml = "You selected " + Radio1.Value;
         }
         else if (Radio2.Checked)
         {
            Span1.InnerHtml = "You selected " + Radio2.Value;
         }
         else if (Radio3.Checked)
         {
            Span1.InnerHtml = "You selected " + Radio3.Value;
         }
      }

      void Page_Load(object sender, EventArgs e)
      {
         // Create an EventHandler delegate for the method you want to
         // handle the event, and then add it to the list of methods
         // called when the event is raised.
         Radio1.ServerChange += new System.EventHandler(this.Server_Change);
         Radio2.ServerChange += new System.EventHandler(this.Server_Change);
         Radio3.ServerChange += new System.EventHandler(this.Server_Change);
      }         

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3>HtmlInputRadioButton ServerChange Example</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode"
             value="Radio Button 1"
             runat="server"/>
      Option 1
      <br />

      <input type="radio" 
             id="Radio2" 
             name="Mode"
             value="Radio Button 2"
             runat="server"/>
      Option 2
      <br />

      <input type="radio" 
             id="Radio3" 
             name="Mode"
             value="Radio Button 3"
             runat="server"/>
      Option 3

      <br />

      <input type="submit" 
             id="Button1" 
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server" />

   </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" >
<head>
    <title>HtmlInputRadioButton ServerChange Example</title>
<script runat="server">

      Sub Server_Change(sender As Object, e As EventArgs) 

         If Radio1.Checked Then

            Span1.InnerHtml = "You selected " & Radio1.Value

         ElseIf Radio2.Checked Then

            Span1.InnerHtml = "You selected " & Radio2.Value

         ElseIf Radio3.Checked Then

            Span1.InnerHtml = "You selected " & Radio3.Value

         End If

      End Sub

      Sub Page_Load(sender As Object, e As EventArgs)

         ' Create an EventHandler delegate for the method you want to
         ' handle the event, and then add it to the list of methods
         ' called when the event is raised.
         AddHandler Radio1.ServerChange, AddressOf Server_Change
         AddHandler Radio2.ServerChange, AddressOf Server_Change
         AddHandler Radio3.ServerChange, AddressOf Server_Change
      
      End Sub         

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3>HtmlInputRadioButton ServerChange Example</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode"
             value="Radio Button 1"
             runat="server"/>
      Option 1
      <br />

      <input type="radio" 
             id="Radio2" 
             name="Mode"
             value="Radio Button 2"
             runat="server"/>
      Option 2
      <br />

      <input type="radio" 
             id="Radio3" 
             name="Mode"
             value="Radio Button 3"
             runat="server"/>
      Option 3

      <br />

      <input type="submit" 
             id="Button1" 
             value="Submit" 
             runat="server"/>

      <br />

      <span id="Span1" 
            runat="server" />

   </form>

</body>
</html>

備註

ServerChange當控制項的 HtmlInputRadioButton 屬性變更貼文到伺服器之間的值時 Checked ，就會引發事件。這可讓您建立自訂事件處理常式，以執行特定指令集 (，例如引發事件時的資料驗證) 。

注意

控制項必須啟用檢視狀態， ServerChange 事件才能正常運作。若要啟用Web Form頁面上所有控制項的檢視狀態，請將 Page.EnableViewState 屬性設定為 true 。您也可以將屬性設定為 true 來啟用個別控制項的 Control.EnableViewState 檢視狀態。

引發事件會透過委派叫用此事件處理常式。如需詳細資訊，請參閱處理和引發事件。

OnServerChange 方法也允許衍生類別處理事件，而不用附加委派。這是在衍生類別中處理事件的慣用技巧。

給繼承者的注意事項

當在衍生類別中覆寫 OnServerChange(EventArgs) 時，請確定呼叫基底類別的 OnServerChange(EventArgs) 方法，使已註冊的委派能接收到事件。

適用於

共用方式為

HtmlInputRadioButton.OnServerChange(EventArgs) 方法

定義

參數

範例

備註

給繼承者的注意事項

適用於

另請參閱

其他資源