共用方式為

HtmlInputRadioButton.Checked 屬性

定義

命名空間:
System.Web.UI.HtmlControls
組件:
System.Web.dll

會獲得或設定一個值，表示是否選擇了控制項 HtmlInputRadioButton 。

public:
 property bool Checked { bool get(); void set(bool value); };
public bool Checked { get; set; }
member this.Checked : bool with get, set
Public Property Checked As Boolean

屬性值

Boolean

true若HtmlInputRadioButton選擇控制項;否則，。 false

範例

以下程式碼範例示範如何利用該 Checked 屬性決定選擇群組中的哪個單選按鈕。

<%@ 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 language="C#" runat="server">

      void Button1_Click(object sender, EventArgs e) 
      {

         if (Radio1.Checked)
            Span1.InnerHtml = "Option 1 is selected";
         else if (Radio2.Checked)
            Span1.InnerHtml = "Option 2 is selected";
         else if (Radio3.Checked)
            Span1.InnerHtml = "Option 3 is selected";
      }

   </script>

</head>
<body>

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

      <h3>HtmlInputRadioButton Sample</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode" 
             runat="server"/>

      Option 1<br />

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

      <input type="radio" 
             id="Radio3" 
             name="Mode" 
             runat="server"/>

      Option 3

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

      <br />
      <input type="button" 
             id="Button1" 
             value="Enter" 
             onserverclick="Button1_Click" 
             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 language="VB" runat="server">

    Sub Button1_Click(sender As Object, e As EventArgs)
        
        If Radio1.Checked = True Then
            Span1.InnerHtml = "Option 1 is selected"
        Else
            If Radio2.Checked = True Then
                Span1.InnerHtml = "Option 2 is selected"
            Else
                If Radio3.Checked = True Then
                    Span1.InnerHtml = "Option 3 is selected"
                End If
            End If
        End If
    End Sub 'Button1_Click

   </script>

</head>
<body>

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

      <h3>HtmlInputRadioButton Sample</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode" 
             runat="server"/>

      Option 1<br />

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

      <input type="radio" 
             id="Radio3" 
             name="Mode" 
             runat="server"/>

      Option 3

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

      <br />
      <input type="button" 
             id="Button1" 
             value="Enter" 
             onserverclick="Button1_Click" 
             runat="server" />

   </form>

</body>
</html>

備註

利用該 Checked 屬性判斷控制是否 HtmlInputRadioButton 被選擇。 如果你有一組 HtmlInputRadioButton 控制，必須逐一遍歷控制，並分別測試 Checked 每個控制項的性質。 你也可以利用這個特性在程式上指定是否選擇了控制項。

你可以透過指定每個想要包含的各項單選按鈕控制項屬性的共同值Name來將控制項分組HtmlInputRadioButton。

備註

當你將控制組組時 HtmlInputRadioButton ，一次只能選擇一個單選按鈕。 Checked所選控制項的屬性設為 true，而群組中其他所有單選按鈕則設定false為 。

適用於

另請參閱