VB.NET：委託給一個實例方法不能有'this'

Question

當我試圖在VB.NET中添加事件處理函數時，我得到一個ArgumentException。

Delegate to an instance method cannot have null 'this' 

唯一的例外發生在這裏：

AddHandler MyClass.SomePropertyChanged, AddressOf MySecondClass.HandleSomePropertyChanged 

類：

Class MyClass  
    Public Event SomePropertyChanged(ByVal sender As Object, ByVal e As SomePropertyChangedEventArgs) 
    Protected Overridable Sub OnSomePropertyChanged(ByVal e As SomePropertyChangedEventArgs) 
     RaiseEvent SomePropertyChanged(Me, e) 
    End Sub 

    'I'm raising the event like this: 
    OnSomePropertyChanged(New SomePropertyChangedEventArgs("Rating", 0.09)) 

End Class 

Class MySecondClass  
    Public Sub HandleSomePropertyChanged(ByVal sender As Object, ByVal e As SomePropertyChangedEventArgs) 
     '... 
    End Sub 
End Class 

EventArgs的我已經定義爲：

Public Class SomePropertyChangedEventArgs 
    Inherits EventArgs 
    Public Property PropertyName As String 
    Public Property Value As Object 
End Class 

我沒有得到什麼這裏的問題 -

Answer 1

這似乎表明，在這條線：

AddHandler MyClass.SomePropertyChanged, AddressOf MySecondClass.HandleSomePropertyChanged 

您MySecondClass變量是Nothing。