防止 C# 因用户输入无效而崩溃

Question

C# 编码的新手，学习这门语言大约 2 周。一年多以来，我一直有一个手机游戏的想法在我脑海中盘旋，我的一个决定是今年学习编码。我正在努力完成 C# 书籍的介绍，并且已经掌握了基础知识，我正在玩弄一个老式的基于文本的冒险作为技能强化剂的编码。我想这是一个由 3 部分组成的问题 1) 我正在尝试编写一个系统，用户可以在其中为属性类型选择 1-10 之间的值，但无法弄清楚如果用户输入其他内容如何阻止程序崩溃比一个整数。 2) 我正在尝试编写一种方法，让游戏从原始属性值中减去已分配的属性值，以确保用户最终不会超过 25。3) 我想在底部允许用户重新开始，如果他们不喜欢设置。下面是我的代码：

        Console.WriteLine("Now you must choose your basic attributes!. You have a total of 25 points to distribute over 5 core skills:");
        Console.WriteLine("Strength, Speed, Intelligence, Personality, and Ingenuity.");
        Console.WriteLine("Choose carefully! Values too high or too low may impact your ability to escape from the world!");
        int attributes = 25;
        int strength = -1;
        int speed = -1;
        int intelligence = -1;
        int personality = -1;
        int ingenuity = -1;
        Console.WriteLine("Attributes remaining: " + (attributes));
        do
        {

            Console.Write("Please choose a value for Strength (0-10): ");
            string strengthAsText = Console.ReadLine();
            strength = Convert.ToInt32(strengthAsText);
            if(strength > 10)
            {
                Console.WriteLine("You can't be that fast!");
            }
            else
            {
                Console.WriteLine("Good choice, please choose the next attribute.");
                attributes = 25 - strength;
                Console.WriteLine("Attributes remaining: " + (attributes));
            }
       }
        while (strength < 0 || strength > 10 && strength <= attributes);

        int attributes2 = (attributes - strength);
        do
        {

            Console.Write("Please choose a value for Speed (0-10): ");
            string speedAsText = Console.ReadLine();
            speed = Convert.ToInt32(speedAsText);
            if (speed > 10)
            {
                Console.WriteLine("You can't be that fast!");
            }
            else if (speed < attributes2)
            {
                Console.WriteLine("You do not have enough remaining attributes to be this fast. Please choose again.");
            }
            else
            {
                Console.WriteLine("Good choice, please choose the next attribute.");
                attributes2 = (attributes2 - speed);
                Console.WriteLine("Attributes remaining: " + (attributes2));
            }
        }
        while (speed < 0 || speed > 10 && speed <= attributes2);

        do
        {
            Console.Write("Please choose a value for Intelligence (0-10): ");
            string intelligenceAsText = Console.ReadLine();
            intelligence = Convert.ToInt32(intelligenceAsText);
            if (intelligence > 10)
            {
                Console.WriteLine("You can't be that smart!");
            }
            else
            {
                Console.WriteLine("Good choice, please choose the next attribute.");
                Console.WriteLine("Attributes remaining: " + (attributes - strength - speed - intelligence));
            }
        }
        while (intelligence < 0 || intelligence > 10 && intelligence <= attributes);

        do
        {
            Console.Write("Please choose a value for Personality (0-10): ");
            string personalityAsText = Console.ReadLine();
            personality = Convert.ToInt32(personalityAsText);
            if (personality > 10)
            {
                Console.WriteLine("You can't be that charismatic!");
            }
            else
            {
                Console.WriteLine("Good choice, please choose the next attribute.");
                Console.WriteLine("Attributes remaining: " + (attributes - strength - speed - intelligence - personality));
            }
        }
        while (personality < 0 || personality > 10 && personality <= attributes);

        do
        {
            Console.Write("Please choose a value for Ingenuity (0-10): ");
            string ingenuityAsText = Console.ReadLine();
            ingenuity = Convert.ToInt32(ingenuityAsText);
            if (ingenuity > 10)
            {
                Console.WriteLine("You can't be that creative!");
            }
            else
            {
                Console.WriteLine("Good choice, please choose the next attribute.");
                Console.WriteLine("Attributes remaining: " + (attributes - strength - speed - intelligence - personality - ingenuity));
            }
        }
        while (ingenuity < 0 || ingenuity > 10 && ingenuity <= attributes);

        Console.WriteLine("Congratulations, you have chosen wisely.");
        Console.WriteLine();
        Console.WriteLine("Your final attribute values are: ");
        Console.WriteLine();
        Console.WriteLine("Strength     " + (strength));
        Console.WriteLine("Speed        " + (speed));
        Console.WriteLine("Intelligence " + (intelligence));
        Console.WriteLine("Personaility " + (personality));
        Console.WriteLine("Ingenuity    " + (ingenuity));
        Console.WriteLine();
        Console.WriteLine("Please press any key to continue...");

        Console.ReadKey();
        Console.WriteLine("You begin you journey by awakening in a pile of what looks like starship debris.");
        Console.ReadKey();
    }
}

}

如果这很混乱，我深表歉意，就像我说的那样，我是新手。谢谢大家的帮助！

Answer 1

要在值不是 int 时阻止程序崩溃，请使用 TryParse 方法：

bool result = Int32.TryParse(value,out number) //value is the input, number is the output
If (result)
{
    //value converted successfully 
}
else
{
    //value failed to convert
}

不需要创建第二个变量attributes2。只需要使用第一个并不断递减它。这将确保您可以跟踪总共 25 个属性。

将您的例程包装在一个方法中，如果用户想像这样重新开始，则再次调用它：

string s = Console.ReadLine();
If (s == "start over")
{
    StartOver(); //this method contains your whole routine
}
else
{
    //exit the application or whatever you want done here
}

防止 C# 因用户输入无效而崩溃

Preventing C# crashing with invalid user input

c#

crash