可有人解释MustOverride？

问题描述

有人能解释不是MustOverride做，但为什么要用它？难道是揭露功能？

Can someone explain not what MustOverride does, but why use it? Is it to expose the function?

我有两个班，第一个（RoomFactory）;

I have two classes, the first (RoomFactory);

Public MustInherit Class RoomFactory : Inherits baseFactory
Private _roomid As Integer = 0
Private _roomname as String = ""

Public Sub New()

End Sub

Public Sub New(ByVal roomid As Integer, ByVal roomname As String)
    Me.RoomId = roomid
    Me.RoomName = roomname
End Sub

Public MustOverride Function CreateRoom(ByVal roomdetails As RoomFactory) As Integer
Public MustOverride Function IsRoomAvailable(ByVal roomdetails as RoomFactory) As Boolean
// .. properties removed for brevity .. //

第二类（室）

Second class (Room)

Public Class Room : Inherits RoomFactory
    Public Function CreateRoom(ByVal roomdetails As RoomFactory) As Integer
        Return 0
    End Function
    Public Function IsRoomAvailable(ByVal roomdetails As RoomFactory) As Boolean
        Return False
    End Function
End Class

首先，我认为这是正确的，但想任何建议，否则 - 性能等，但我想主要的问题是 - 为什么使用MustOverride

Firstly, I think this is right, but would like any advice to the otherwise - performance etc. But I guess the primary question is - why use the MustOverride?

请点击这里原谅我的无知。

Please excuse my ignorance here.

推荐答案

它是如此，你可以提供一个基类常见的功能，但力派生类来实现功能本身的特定位。

It's so that you can provide common functionality in a base class, but force derived classes to implement specific bits of functionality themselves.

在你的工厂的情况，我会建议使用的界面，而不是一个抽象类，但在其他情况下，这是有道理的。 System.Text.Encoding 是一个抽象类的一个很好的例子，如的System.IO.Stream 。

In your factory situation I would suggest using an interface rather than an abstract class, but in other cases it makes sense. System.Text.Encoding is a good example of an abstract class, as is System.IO.Stream.

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