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分享关于delegate的疑问。
各位，既然有了interface，C#干吗还要引入delegate啊，难道就为了
他的event机制吗？还是有什么其它的意思？
他的event机制吗？还是有什么其它的意思？
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jennyq_zq 2003-07-31
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The delegate tutorial in MSDN mentions the difference:
delegate is useful when single function is used, or several implemetations of one method specification are used. Those functions are parallel.
Interface is mostly a set of methods specification. Those functions might have relationship between each other and the caller is likely to cast interface to or from other objects, interfaces. And also Interface can inherit another Interface.
I think they are two levels of abstraction: function, class.
The Observer pattern should be based on Interface, it is almost impossible to use delegate to implement Director, which has to describe the complex communication between colleagues.
delegate is useful when single function is used, or several implemetations of one method specification are used. Those functions are parallel.
Interface is mostly a set of methods specification. Those functions might have relationship between each other and the caller is likely to cast interface to or from other objects, interfaces. And also Interface can inherit another Interface.
I think they are two levels of abstraction: function, class.
The Observer pattern should be based on Interface, it is almost impossible to use delegate to implement Director, which has to describe the complex communication between colleagues.
qimini 2003-07-31
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實現設計模式的Observer模式
