C#难题:可到达的goto指向不可达的标签 [英] C# Puzzle : Reachable goto pointing to an unreachable label

问题描述

以下是这篇文章中的Eric Lippert的评论:

Here's Eric Lippert's comment from this post:

现在您知道答案了，您可以 解决这个难题:给我写一个程序 在其中有一个可到达的goto 这将导致无法访问的标签. – 埃里克·利珀特(Eric Lippert)7月17日下午7:17

Now that you know the answer, you can solve this puzzle: write me a program in which there is a reachable goto which goes to an unreachable label. – Eric Lippert Jul 17 at 7:17

我无法创建将具有可到达的goto指向不可到达的标签的代码.那有可能吗?如果是，那么C#代码是什么样的?

I am not able to create a code which will have reachable goto pointing to an unreachable label. Is that even possible? If yes, what would the C# code look like?

注意:我们不要讨论'goto'的坏处，等等.这是理论上的练习.

Note: Let's not get into discussion about how 'goto' is bad etc. This is a theoretical exercise.

推荐答案

我的原始答案:

    try
    {
        goto ILikeCheese;
    }
    finally
    {
        throw new InvalidOperationException("You only have cottage cheese.");
    }
ILikeCheese:
    Console.WriteLine("MMM. Cheese is yummy.");

这里没有编译器警告.

    bool jumping = false;
    try
    {
        if (DateTime.Now < DateTime.MaxValue)
        {
            jumping = (Environment.NewLine != "\t");
            goto ILikeCheese;
        }

        return;
    }
    finally
    {
        if (jumping)
            throw new InvalidOperationException("You only have cottage cheese.");
    }
ILikeCheese:
    Console.WriteLine("MMM. Cheese is yummy.");

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