Execute方法之前和代码块之后 [英] Execute Method Before and After Code Block

问题描述

我怎么能换一些代码在括号中做到以下几点？

How could I wrap some code in brackets to do the following?

MyCustomStatement(args){
// code goes here
}

因此，在括号中的代码执行前， LL调用方法时括号中的代码执行完毕，将调用另一个方法。是否有这样的事情吗？我知道这似乎是多余的做到这一点时，我根本就前后代码和所有后调用的方法，但我只是很好奇。我不知道该怎么这个词正是因为我是新来编程。

So that before the code in the brackets executes, it'll call a method and when the code in the brackets finishes executing it will call another method. Is there such a thing? I know it seems redundant to do this when I can simply call the methods before and after the code and all, but I simply was curious. I don't know how to word this exactly because I'm new to programming.

谢谢！

推荐答案

您可以通过存储在执行一个抽象类的代码之前和之后为你的代码，当你调用运行（）：

You can do this by storing the code in an abstract class that executes the "before" and "after" code for you when you call Run():

public abstract class Job
{
    protected virtual void Before()
    {
        // Executed before Run()
    }

    // Implement to execute code
    protected abstract void OnRun();

    public void Run()
    {
        Before();
        OnRun();
        After();
    }

    protected virtual void After()
    {
        // Executed after Run()
    }
}

public class CustomJob : Job
{
    protected override void OnRun()
    {
        // Your code
    }
}

和调用代码：

new CustomJob().Run();

当然，那么每一件定制的代码，就必须创建一个新的类，它可能小于希望的。

Of course then for every piece of custom code you'll have to create a new class, which may be less than desirable.

这是更简单的方法是使用一个动作：

An easier way would be to use an Action:

public class BeforeAndAfterRunner
{
    protected virtual void Before()
    {
        // Executed before Run()
    }

    public void Run(Action actionToRun)
    {
        Before();
        actionToRun();
        After();
    }

    protected virtual void After()
    {
        // Executed after Run()
    }
}

，你可以这样调用：

public void OneOfYourMethods()
{
    // your code
}

public void RunYourMethod()
{
    new BeforeAndAfterRunner().Run(OneOfYourMethods);
}

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