Question

在页面加载时使用RadioButtonList()类创建的一组单选按钮添加了一个事件，同时尝试设置控件的事件OnSelectedIndexChanged，但Visual Studio和页面测试都给了我以下错误：

System.Web.UI.WebControls.ListControl.Protected Overridable Sub 无法访问OnSelectedIndexChanged（e As System.EventArgs）这个背景是因为它受到了保护＆＃39;。

为什么无法以编程方式访问此控件的此事件并告诉我它是Protected？

这是代码：

Sub Page_Load(Sender As Object, E As EventArgs)                        
       Dim group_answers As New RadioButtonList()
       group_answers.AutoPostBack = True
       AddHandler group_answers.OnSelectedIndexChanged, AddressOf check_selection

       group_answers.Items.Add(New ListItem("0%", "17"))
       group_answers.Items.Add(New ListItem("10%", "18"))
       group_answers.Items.Add(New ListItem("20%", "19"))
       group_answers.Items.Add(New ListItem("30%", "20"))                                              

       group_answers.RepeatDirection = RepeatDirection.Horizontal                            
       question_answer.Controls.Add(group_answers)    
End Sub

Answer 1

我认为您要订阅SelectedIndexChanged事件：

AddHandler group_answers.SelectedIndexChanged, AddressOf check_selection

尝试以编程方式设置RadioButtonList的事件

1 个答案: