C# 错误:使用未分配的局部变量

问题描述

我不确定为什么会出现这个错误，但这段代码不应该编译吗，因为我已经在检查队列是否正在初始化?

I'm not sure why I'm getting this error, but shouldn't this code compile, since I'm already checking to see if queue is getting initialized?

public static void Main(String[] args)
{
    Byte maxSize;
    Queue queue;

    if(args.Length != 0)
    {
        if(Byte.TryParse(args[0], out maxSize))
            queue = new Queue(){MaxSize = maxSize};
        else
            Environment.Exit(0);
    }
    else
    {
        Environment.Exit(0);
    }

    for(Byte j = 0; j < queue.MaxSize; j++)
        queue.Insert(j);
    for(Byte j = 0; j < queue.MaxSize; j++)
        Console.WriteLine(queue.Remove());
}

所以如果队列没有被初始化，那么 for 循环就无法到达，对吧?由于程序已经以 Environment.Exit(0) 终止?

So if queue is not initialized, then the for loops aren't reachable right? Since the program already terminates with Environment.Exit(0)?

希望各位大神指点一下:)

Hope ya'll can give me some pointers :)

谢谢.

推荐答案

编译器不知道Environment.Exit()会终止程序；它只是看到你在一个类上执行一个静态方法.声明时只需将 queue 初始化为 null.

The compiler doesn't know that the Environment.Exit() is going to terminate the program; it just sees you executing a static method on a class. Just initialize queue to null when you declare it.

Queue queue = null;

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