C# 错误:使用未分配的局部变量

C# error: Use of unassigned local variable(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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