1. img tags with src="" or Image tags with ImageUrl="
2. Using AutoEventWireup="true" and adding a page handler
3. Having manually added the event handler (more common for C# than VB)
4. Handling both MyBase.Load and Me.Load

最后我的问题….

我的页面继承自一个包含页面加载处理程序的类，该页面继承自具有页面加载处理程序的类。

Public Class C1
    Inherits System.Web.UI.Page
   Protected Overridable Sub PageLoad(ByVal sender As Object,ByVal e As System.EventArgs) Handles Me.Load
   End Sub
End Class

Public Class C2
    Inherits C1
    Protected Overrides Sub PageLoad(ByVal sender As Object,ByVal e As System.EventArgs) Handles Me.Load
        MyBase.PageLoad(sender,e)
    End Sub
End Class

Public Class MyPage 
    Inherits C2
    Protected Overrides Sub PageLoad(ByVal sender As Object,ByVal e As System.EventArgs) 
        MyBase.PageLoad(sender,e)
    End Sub
End Class

我测试了这个，如果你把一个Handles在MyPage中的方法，它会得到3次的打击…