要改变这样的字符串的内容导致异常？ [英] Should changing the contents of a string like this cause an exception?

问题描述

考虑下面的代码：

using System;
using System.Runtime.InteropServices;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            const string test = "ABCDEF"; // Strings are immutable, right?
            char[] chars = new StringToChar{str=test}.chr;
            chars[0] = 'X';

            // On an x32 release or debug build or on an x64 debug build, 
            // the following prints "XBCDEF".
            // On an x64 release build, it prints "ABXDEF".
            // In both cases, we have changed the contents of 'test' without using
            // any 'unsafe' code...

            Console.WriteLine(test);
        }
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct StringToChar
    {
        [FieldOffset(0)]
        public string str;
        [FieldOffset(0)]
        public char[] chr;
    }
}

通过运行这段代码，我们能够改变字符串的内容没有例外发生的历史。我们没有宣布任何不安全的代码，这样做。 ！这段代码显然是非常不可靠的。

By running this code, we are able to change the contents of a string without an exception occuring. We did not have to declare any unsafe code to do so. This code is clearly very dodgy!

我的问题很简单：你认为异常应通过上面的代码

My question is simply this: Do you think that an exception should be thrown by the code above?

推荐答案

我的投票对决策FieldOffset不安全。

My vote's on making FieldOffset unsafe.

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