如何将`|`操作数应用于字符串? [英] How can I apply the `|` operand to a string?

问题描述

我在这里遇到此行代码的问题...为什么提示我出现此错误?我收到一条错误消息，说操作员'|'不能应用于类型为'bool'和'string'的操作数如何检查我的驻留变量是否不等于我在if语句中列出的这两个字符串?

I am having trouble with this line of code right here...why am I being prompted with this error? I am getting an error saying "Operator '|' cannot be applied to operands of type 'bool' and 'string' How do check if my residency variable is not equal to these 2 strings I have listed in the if statement?

catch (ArgumentException)
            {
                if (age > 16 | age > 80)
                {
                    Console.WriteLine("You can only enter states of OH or MI ad the driver's age must be between 16 and 80.");
                }
                if (residency != "OH" | "MI")
                {
                    Console.WriteLine("You can only enter states of OH or MI ad the driver's age must be between 16 and 80.");
                }
            }

如果您想更好地了解我要执行的操作，则这里是完整的代码.

Here is the full code if you want to get a better idea of what I am trying to execute.

class Program
    {
        static void Main(string[] args)
        {
            CarInsurance create = new CarInsurance();
            Console.Write("Enter the age of the driver: ");
            int age = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter the state the driver lives in: ");
            string residence = Convert.ToString(Console.ReadLine());
            create.PremiumCalculate(age, residence);
        }
    }
    class CarInsurance
    {
        public int driverAge { get; set; }
        public string residency { get; set; }
        public int totalPremium;

        public int GetPremium()
        {
            return totalPremium;
        }
        public void PremiumCalculate(int age, string residency)
        {
            int premiumOhio = 100;
            int premiumMichigan = 250;
            try
            {
                if (residency == "MI")
                {
                    int total = (100 - age) * 3 + premiumMichigan;
                    Console.WriteLine("Your premium is {0}", total.ToString("C"));
                }
                if (residency == "OH")
                {
                    int total = (100 - age) * 3 + premiumOhio;
                    Console.WriteLine("Your premium is {0}", total.ToString("C"));
                }
            }
            catch (ArgumentException)
            {
                if (age > 16 | age > 80)
                {
                    Console.WriteLine("You can only enter states of OH or MI ad the driver's age must be between 16 and 80.");
                }
                if (residency != "OH" | "MI")
                {
                    Console.WriteLine("You can only enter states of OH or MI ad the driver's age must be between 16 and 80.");
                }
            }
        }
    }

推荐答案

您应该在两个条件(而不是值)之间应用它.注意

You should apply it between two conditions, not values. Note

if (residency != "OH" || residency != "MI")

但是请注意，此条件将始终返回 true .您可能打算使用&& :

Note, however, that this condition will always return true. You probably meant to use &&:

if (residency != "OH" && residency != "MI")

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