Question

任何人都可以帮我解决问题吗？

struct Player
{
    public string Name;
    public int X;
    public int Y;
}
static Player[] players = new Player[amountofPlayers];

static void ResetGame() {
    Console.WriteLine("Welcome to the game!");
    Console.Write("How many player will be taking part today: ");
    string playerNo = Console.ReadLine();
    amountofPlayers = int.Parse(playerNo);
    if (amountofPlayers <= 4)
    {
        for (int i = 0; i < amountofPlayers; i = i + 1)
        {
            int displayNumber = i + 1;
            Console.Write("Please enter the name of player " + displayNumber + ": ");
            players[i].Name = Console.ReadLine(); //error is here
        }
    }
    else
    {
        Console.WriteLine("Please enter a number of players less than 4!");
    }
}

static int amountofPlayers;

Answer 1

这一行：

static Player[] players = new Player[amountofPlayers];

在根据用户输入为amountOfPlayers分配值之前，

正在执行。因此amountOfPlayers的默认值为0，您将创建一个包含0个元素的数组。

我建议您只声明变量：

 static Player[] players;

然后在amountOfPlayers方法中使ResetGame成为本地变量，在您询问有多少玩家后初始化数组：

static void ResetGame() {
    Console.WriteLine("Welcome to the game!");
    Console.Write("How many player will be taking part today: ");
    string playerNo = Console.ReadLine();
    int amountofPlayers = int.Parse(playerNo);
    players = new Player[amountOfPlayers];
    ...
}

我＆＃39; 还建议将Player作为一个类而不是一个结构，保持字段为私有，并改为使用属性。

Answer 2

你的玩家阵列被初始化为0，因为它是静态的，起初你的numberofPlayers是0.当你获得玩家数量时，你必须初始化它。

static Player[] players;
static int amountofPlayers;

static void ResetGame()
{
    Console.WriteLine("Welcome to the game!");
    Console.Write("How many player will be taking part today: ");
    string playerNo = Console.ReadLine();
    amountofPlayers = int.Parse(playerNo);

    if (amountofPlayers <= 4)
    {
        players = new Player[amountofPlayers];
        for (int i = 0; i < amountofPlayers; i = i + 1)
        {
            int displayNumber = i + 1;
            Console.Write("Please enter the name of player " + displayNumber + ": ");
            players[i].Name = Console.ReadLine(); //error is here
        }
    }
    else
    {
        Console.WriteLine("Please enter a number of players less than 4!");
    }
}

Answer 3

    struct Player
        {
            public string Name;
            public int X;
            public int Y;
        }
        static Player[] players = new Player[amountofPlayers];


        static void ResetGame() {
            Console.WriteLine("Welcome to the game!");
            Console.Write("How many player will be taking part today: ");
            string playerNo = Console.ReadLine();
            amountofPlayers = int.Parse(playerNo);
         Array.Resize(ref  players, amountofPlayers ); /// this will resize your array element to the accepted amount of player
                if (amountofPlayers <= 4)
                {
                    for (int i = 0; i < amountofPlayers; i = i + 1)
                    {
                        int displayNumber = i + 1;
                        Console.Write("Please enter the name of player " + displayNumber + ": ");
                        players[i].Name = Console.ReadLine(); //error is here
                    }
                }
                else
                {
                    Console.WriteLine("Please enter a number of players less than 4!");
                }
        }

        static int amountofPlayers;

Answer 4

players在设置amountofPlayers之前初始化（即当amountofPlayers仍然为零时）

看到您只想允许最多4个玩家设置，您可能需要将amountofPlayers初始化为4：

static int amountofPlayers = 4;

C＃中的indexoutofrangeexception

4 个答案: