什么是“这个"构造函数，它是做什么用的 [英] what is 'this' constructor, what is it for

问题描述

我正在学习过程中，我有一个问题无法找到满意的答案.

I'm in the learning process and I have a question I havent been able to find a satisfactory answer for.

this 我需要一个概要.我一直看到它，人们已经为我使用它的代码提出了修复建议.我真的不知道它到底是做什么的.如果有人能这么好心地给我一个基本的纲要，我会非常高兴.

this I need a rundown on it. I keep seeing it and people have suggested fixes for my code that use it. I really have no idea what exactly it does. If someone would be so kind as to give me a basic rundown on it I would be really happy.

推荐答案

用于引用同一个类中的另一个构造函数.你用它来继承"另一个构造函数:

It's used to refer to another constructor in the same class. You use it to "inherit" another constructor:

public MyClass() {}

public MyClass(string something) : this() {}

在上面，当调用第二个构造函数时，它先执行无参数构造函数，然后再执行自己.请注意，使用 :this() 等价于 :base()，不同之处在于它指的是同一类中的构造函数，而不是父类.

In the above, when the second constructor is invoked, it executes the parameterless constructor first, before executing itself. Note that using : this() is the equivalent of : base(), except it refers to a constructor in the same class, instead of the parent class.

有一篇关于构造函数的文章这里 (MSDN)，它提供了一个使用示例:

There's an article about constructors here (MSDN), which provides a usage example:

public Employee(int annualSalary)
{
    salary = annualSalary;
}

public Employee(int weeklySalary, int numberOfWeeks)
    : this(weeklySalary * numberOfWeeks)
{
}

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