如何生成可以包含加号或减号(- 或 +)的随机字符串 [英] How can i generate a random string that can contain either plus sign or minus sign (- or +)

问题描述

我正在制作一个数学游戏，我需要让它随机化 - 或 +.
我已经试过了:

I'm making a math game, and I need to make it randomize either - or +.
I have already tried this:

Random rnd = new Random();
string name = rnd.Next(-, +);  

但这行不通，有没有人有办法做到这一点?注意:我是初学者

But that doeen't work, Anyone have a way I can do this? Note: Im a beginner

推荐答案

public static class Extensions
{
    public static T NextItem<T>(this Random r, params T[] items)
    {
        //  Thanks to nbokmans for catching my error here: The second parameter
        //  is not the largest value it can return; it's the "exclusive upper bound".
        return items[r.Next(0, items.Length)];
    }
}

...

Random rnd = new Random();
string name = rnd.NextItem("-", "+");

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