在C#中进行委托.其目的是什么? [英] delegate in c# .what its purpose?

问题描述

C#编译器将委托公开为引用类型，您无法使用new运算符实例化委托.我们无法使用新关键字实例化委托.

请解决

thanx

the C# compiler exposes delegates as reference types, you could not instantiate the delegate by using the new operator.we cannot instantiate a delegate by using new key word.

please resolve it

thanx

推荐答案

将其搜索为"Delegate in c#"，您将不会获得任何结果.好的文章，将帮助您理解概念. :)

Google it for "Delegate in c#" and you will get no. of good articles which will help you to understand the concept. :)

实际上已委派了代表，例如，参见: [ ^ ].

Actually delegates are istantiated, see, for instance: "Delegates Tutorial at MSDN"[^].

委托不是实例，而是代表对方法的引用的变量.
结果，您无法使用new运算符来实例化它:这意味着您正在创建一个新方法，这显然很愚蠢！
如果您将委托视为方法的指针"，那么您就在那里.这是稍后访问方法而无需知道其名称的一种方法.

A delegate is not an instance - it is a variable holding a reference to a method.
As a result, you cannot instantiate it by using the new operator: that would imply that you are creating a new method, which is plainly silly!

If you think of a delegate as a "Pointer to a method" then you are there. It is a way to access a method later without needing to know it''s name at that point.

public string GetScreenName() { return "Screen"; }
public string GetPrinterName() { return "Printer"; }
public delegate string GetNameMethod();
public GetNameMethod GetName;
...
            if (isUsingScreen)
                {
                GetName = GetScreenName;
                }
            else
                {
                GetName = GetPrinterName;
                }
            Console.WriteLine(GetName());

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