我可以在构造函数中同时调用this和base重载吗? [英] Can I call both this and base overloads in a constructor?

问题描述

我能找到的最接近的线程是这一个，但是情况有所不同-要调用的基本构造函数是默认构造函数.在这里，我需要指定要传递的参数.

The closest thread I could find was this one, but the scenario there is different - the base constructor to be called is the default one. Here I need to specify which parameter I want to pass it.

假设我们有以下情形:

    public class Base
    {
        public string Str;

        public Base(string s)
        {
            Str = s;
        }
    }

    public class A : Base
    {
        public string Str2;

        public A(string str2)
            : base(str2)
        {
            Str2 = str2;
        }

        public A(string str2, string str)
            : base(str)
        {
            Str2 = str2;
        }
    }

我想避免在A的第二个构造函数重载中重复相同的逻辑(从技术上讲，我可以将所有逻辑包装到一个减少复制粘贴/提高可维护性的函数中，因为最终所有重载都依赖于同一代码.如果没有其他解决方案，请按照此步骤操作.)

I want to avoid repeating the same logic in A's 2nd constructor overload (technically I could wrap all the logic into a function reducing the copy-paste / improving maintainability, for at the end all overloads would rely in the same code. Would follow this if there is no other solution).

我以为我可以先调用A的第一个构造函数重载，然后再调用基数.但似乎我做不到.

I thought I could call first A's 1st constructor overload and afterwards the base one. But seems I can't.

这里的方法是什么?

推荐答案

正确的方法是

public class A : Base
{
    public string Str2;

    public A(string str2)
        : this(str2, str2)
    {
    }

    public A(string str2, string str)
        : base(str)
    {
        Str2 = str2;
    }
}

A 的单参数构造函数调用 A 的2参数构造函数，使用 this(而不是 base(.然后删除单参数构造函数的主体，因为所有工作都在两个参数构造函数中完成.

The single parameter constructor of A calls the 2 parameter constructor of A passing in the same string to both parameters using this( instead of base(. You then remove the body of the single parameter constructor because all of the work is being done in the two parameter constructor.

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