如何在C＃中为其他类传递函数指针委托 [英] How do I pass a function pointer delegate for a different class in c#

问题描述

在c ++中，
到一个函数中，该函数接受一个带有无效返回类型的函数指针，例如：

In c++, To a function that takes in a function pointer with void return type, eg:

void TakesFun(Func<void ()>  fun ){
    fun();
}

上述功能可以通过以下方式调用

Above function can be called in these ways

//if foo is a function returning void but is declared in global space and not part of another class
TakesFun(bind(foo));   
//if foo is a function returning void but is declared in class called ClassX and the function is required to be called for object "obj".
TakesFun(bind(ClassX::foo, obj));   
//if foo is a function taking an integer as argument and returning void but is declared in class called ClassX and the function is required to be called for object "obj".
TakesFun(bind(ClassX::foo, obj, 5)); //5 is the argument supplied to function foo   

的参数，您能帮我为3个类似的函数编写C＃代码吗电话吗？我尝试阅读有关Delegates的内容，但示例并未涵盖上述所有3种情况。

Could you help me write C# code for 3 similar function calls? I tried reading up on Delegates, but the examples do not cover all the above 3 cases.

推荐答案

正如@Backs所说，您可以这样定义 TakesFun 函数：

As @Backs said, you can define TakesFun function like this:

void TakesFun(Action action) => action();

如果需要传递参数，则可以使用以下命令：

If you need to pass a parameter, you can use this:

void TakesFun<TParam>(Action<TParam> action, TParam p) => action(p);

您的3个示例将是：

TakesFun(SomeClass.Foo); // 'Foo' is a static function of 'SomeClass' class
TakesFun(obj.Foo); // 'Foo' is a function of some class and obj is instance of this class
TakesFun(obj.Foo, "parameter"); // as above, but will pass string as parameter to 'Foo'

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