VB.NET：聲明一個基類非重寫

Question

我有一個基類foo將在相似但略有不同功能的多個子類中使用的內部函數：

Public MustInherit Class foo 
    Public Function bar1() as Something 
     ''// Perfectly OK to change what this method does 
    End Function 

    Public Function bar2() as Something 
     ''// Does a very specific thing I don't want changed ever, 
     ''// but this function must be inherited 
    End Function 
End Class 

如何獲得編譯器生成一個錯誤，當bar2()被子類覆蓋？

Answer 1

指定函數定義的關鍵字NotOverridable：

Public NotOverridable Function bar2() As Something 
    ''// Does a very specific thing I don't want changed ever, 
    ''// but this function must be inherited 
End Function 

Answer 2

NotOverridable？