22. Delegates

最新推荐文章于 2024-02-07 17:33:29 发布

Talin

最新推荐文章于 2024-02-07 17:33:29 发布

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文章标签： Pascal C C++ C#

本文介绍了C#中委托的概念，委托是一种引用类型，用于封装方法的引用。与C++中的函数指针不同，委托是完全面向对象的，并且可以封装实例方法及静态方法。文章还解释了委托实例如何调用其包含的方法。

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[Note: Delegates enable scenarios that other languages?such as C++, Pascal,
and Modula?have addressed with
function pointers. Unlike C++ function pointers, however, delegates are
fully object oriented, and unlike
C++ pointers to member functions, delegates encapsulate both an object
instance and a method. end note]
A delegate declaration defines a class that is derived from the class
System.Delegate. A delegate instance
encapsulates one or more methods, each of which is referred to as a
callable entity. For instance methods, a
callable entity consists of an instance and a method on that instance. For
static methods, a callable entity consists
of just a method. Given a delegate instance and an appropriate set of
arguments, one can invoke all of that
delegate instance?s methods with that set of arguments.
[Note: An interesting and useful property of a delegate instance is that it
does not know or care about the classes
of the methods it encapsulates; all that matters is that those methods be
compatible (§22.1) with the delegate?s
type. This makes delegates perfectly suited for ?anonymous? invocation. end
note]