书中的一段 [英] passage in a book

问题描述

i正在阅读一本关于以下内容的vb.net书：


接口允许你使用方法编程对象上的界面而不是

方法？


这对lamen的条款有什么好处？


谢谢，

mj

i was reading a vb.net book that said the following regarding:

Interfaces allow you to program using methods on the interface rather than
methods on the object?

How is this a benefit in lamen''s terms?

thanks,
mj

推荐答案

它基本上意味着它允许你以对象的方式来看待对象它的

界面 - 因此可以保证它有一个特定的方法。


所以让我们说你有A，B，C类。将有一个

对象的集合，集合中的每个对象将是

之一的实例。您可以：

a）查看集合中的每个对象，确定它是A，B还是C.

然后将其转换为正确的类型，并调用方法DoSomething上面

b）让每个类实现ISomeInterface，它有一个方法DoSomething。

然后只需将每个对象转换为ISomeInterface并调用DoSomething。


哪个更容易？


考虑一下，你要添加一个D类。场景''a''，你必须

更改您的集合的代码，现在处理D类。场景

''b''，您不需要做任何事情，只要D类实现

ISomeInterface。


" mattie" <毫安**** @ discussions.microsoft.com>在留言中写道

新闻：3A ********************************** @ microsof t.com ...

It basically means that it allows you to look at the object in terms of its
interface - and thus be guaranteed that it has a particular method.

So let''s say you have classes A, B, C. You will have a collection of
objects, and each object in the collection will be an instance of one of
those. You can either:
a) Look at each object in the collection, figure out if it''s an A, B or C.
Then cast it to the right type, and call method DoSomething on it
b) Make each class implement ISomeInterface which has a method DoSomething.
Then just cast each object to an ISomeInterface and call DoSomething.

Which is easier?

Consider down the road, you add a class D. Scenario ''a'', you would have to
change the code for your collection to now deal with a class D. Scenario
''b'', you don''t need to do anything, as long as class D implements
ISomeInterface.

"mattie" <ma****@discussions.microsoft.com> wrote in message
news:3A**********************************@microsof t.com...

我正在阅读一本关于以下内容的vb.net书：

接口允许你程序在界面上使用方法而不是对象上的方法？

如何在lamen的条款中获益？

谢谢， mj

它基本上意味着它允许您根据其

界面查看对象 - 因此保证它有一个特定的方法。


所以，假设你有A，B，C类。你将有一个

对象的集合，集合中的每个对象都是

之一的实例。您可以：

a）查看集合中的每个对象，确定它是A，B还是C.

然后将其转换为正确的类型，并调用方法DoSomething上面

b）让每个类实现ISomeInterface，它有一个方法DoSomething。

然后只需将每个对象转换为ISomeInterface并调用DoSomething。


哪个更容易？


考虑一下，你要添加一个D类。场景''a''，你必须

更改您的集合的代码，现在处理D类。场景

''b''，您不需要做任何事情，只要D类实现

ISomeInterface。


" mattie" <毫安**** @ discussions.microsoft.com>在留言中写道

新闻：3A ********************************** @ microsof t.com ...

It basically means that it allows you to look at the object in terms of its
interface - and thus be guaranteed that it has a particular method.

So let''s say you have classes A, B, C. You will have a collection of
objects, and each object in the collection will be an instance of one of
those. You can either:
a) Look at each object in the collection, figure out if it''s an A, B or C.
Then cast it to the right type, and call method DoSomething on it
b) Make each class implement ISomeInterface which has a method DoSomething.
Then just cast each object to an ISomeInterface and call DoSomething.

Which is easier?

Consider down the road, you add a class D. Scenario ''a'', you would have to
change the code for your collection to now deal with a class D. Scenario
''b'', you don''t need to do anything, as long as class D implements
ISomeInterface.

"mattie" <ma****@discussions.microsoft.com> wrote in message
news:3A**********************************@microsof t.com...

我正在阅读一本关于以下内容的vb.net书：

接口允许你程序在界面上使用方法而不是对象上的方法？

如何在lamen的条款中获益？

谢谢， mj

感谢您的解释。你说的是什么意思：


然后将每个对象转换为ISomeInterface并调用DoSomething。


语法如何查找那条线？


mj


" Marina"写道：

thanks for the explanation. what do you mean when you said:

Then just cast each object to an ISomeInterface and call DoSomething.

how would the syntax look for that line?

mj

"Marina" wrote:

它基本上意味着它允许您根据其界面查看对象 - 因此可以保证它具有特定的方法。

所以，假设您有A，B，C类。您将拥有一组
对象，并且该集合中的每个对象都将是其中一个对象的实例。 。您可以：
a）查看集合中的每个对象，确定它是A，B还是C.
然后将其转换为正确的类型，并调用方法DoSomething
b）让每个类实现ISomeInterface，它有一个DoSomething方法。
然后将每个对象转换为一个ISomeInterface并调用DoSomething。

哪个更容易？
<考虑下来，你要添加一个D类。场景''a''，你将不得不改变你的收藏代码，现在处理D类。情景
'' b''，你不需要做任何事情，只要D级实现了ISomeInterface。

mattie <毫安**** @ discussions.microsoft.com>在消息中写道
新闻：3A ********************************** @ microsof t.com。 ..

It basically means that it allows you to look at the object in terms of its
interface - and thus be guaranteed that it has a particular method.

So let''s say you have classes A, B, C. You will have a collection of
objects, and each object in the collection will be an instance of one of
those. You can either:
a) Look at each object in the collection, figure out if it''s an A, B or C.
Then cast it to the right type, and call method DoSomething on it
b) Make each class implement ISomeInterface which has a method DoSomething.
Then just cast each object to an ISomeInterface and call DoSomething.

Which is easier?

Consider down the road, you add a class D. Scenario ''a'', you would have to
change the code for your collection to now deal with a class D. Scenario
''b'', you don''t need to do anything, as long as class D implements
ISomeInterface.

"mattie" <ma****@discussions.microsoft.com> wrote in message
news:3A**********************************@microsof t.com...

我正在读一本关于以下内容的vb.net书：

接口允许你使用方法编程对象的界面而不是
方法？

这对lamen的术语有什么好处？

谢谢，
mj

i was reading a vb.net book that said the following regarding:

Interfaces allow you to program using methods on the interface rather than
methods on the object?

How is this a benefit in lamen''s terms?

thanks,
mj

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