关键字“参数"到底如何工作? [英] How exactly keyword 'params' work?

问题描述

以下代码示例打印:

T
T[]
T[]

前两行符合预期，为什么编译器选择param数组作为常规数组?

While first two lines are as expected, why compiler selected param array for a regular array?

public class A
{
    public void Print<T>(T t)
    {
        Console.WriteLine("T");
    }

    public void Print<T>(params T[] t)
    {
        Console.WriteLine("T[]");
    }
}

class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        a.Print("string");
        a.Print("string","string");
        a.Print(new string[] {"a","b"});
    }
}

推荐答案

内幕

a.Print("string","string");

仅仅是...的语法糖

a.Print(new string[]{"string","string"});

就像我说的那样， params 关键字仅自动为您创建数组，您告诉编译器:直接接受 T 数组或使用X输入参数来构造该数组.

Like I said, the params keyword only automagically creates the array for you, you tell the compiler: either accept an array of T directly or use the X input params to construct that array.

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