.net - 基类中的地址

Question

当引用一个方法的地址时，我们是否应该考虑重写？

Class B 
  Inherits A

  Overrides Sub Foo
     Console.WriteLine("B")
  End Sub
End Class


Class A
  Public Sub PFoo
  ... AddressOf Foo ... ' WHAT WILL DO THIS METHOD??? '
  End

  Protected Overridable Sub Foo()
     Console.WriteLine("A")
  End Sub
End Class

Answer 1

它将打印 B。为了更清楚地表明您的意图，您可以放置​​ AddressOf Me.Foo。另外，仅供引用，如果您放置 MyClass.Foo，它将打印 A

    Module Module1

    Sub Main()

        Dim b As B = New B
        b.PFoo() ' prints B
        Console.ReadLine()

    End Sub

End Module

Public Class B
    Inherits A

    Protected Overrides Sub Foo()
        Console.WriteLine("B")
    End Sub
End Class

Public Class A
    Public Sub PFoo()
        Dim f As Action = New Action(AddressOf Me.Foo)
        f.Invoke()
    End Sub

    Protected Overridable Sub Foo()
        Console.WriteLine("A")
    End Sub
End Class