何时以及为什么应该使用 ClassName : this(null)? [英] When and why should I use ClassName : this(null)?

问题描述

我无法理解一个简单的裸

i can't understand the difference between a simple bare

Public ClassName() {}

和

Public ClassName() : this(null) {}

我知道只有当我有一个 +1 重载的构造函数时我才能使用它，但是我无法理解以这种方式定义无参数构造函数的优点.

I know I can use it only if i have a +1 overloaded ctor, but I can't understand the advantages of defining the parameterless constructor this way.

推荐答案

这允许单参数构造函数拥有所有逻辑，因此不再重复.

This permits the single-param constructor to have all the logic, so it isn't repeated.

public ClassName() : this(null) {}

public ClassName(string s)
{
    // logic (code)
    if (s != null) {
        // more logic
    }
    // Even more logic
}

我希望很清楚，如果不是 this(null)，逻辑"和更多逻辑"将需要在无参数构造函数中重复.

I hope it's clear that the "logic" and "even more logic" would have needed to be repeated in the parameterless constructor if not for the this(null).

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