Question

在引用方法的地址时，我们是否应该考虑覆盖？

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.为了使你的意图更加明显，你可以放置AddressOf Me.Foo。另外，就像一个FYI，如果你把MyClass.Foo，它会打印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

Answer 2

我相信如果在继承的B类/对象实例中调用PFoo，PFoo将引用在继承类中重写的Foo。

AddressOf在基类中

2 个答案: