C# switch 语句字符串到字符错误

Question

using System;
namespace prac4b
{
    class prac4b
    {
        static void Main(string[] args)
        {
            int number1, number2, result;
            char action;
            string tempVal = "";
            bool parseAttempt = false;

            // ask for first number
            Console.ReadLine();
            Console.Write("Enter number > ");

            //testing if integer with TryParse
            tempVal = Console.ReadLine();
            parseAttempt = Int32.TryParse(tempVal, out number1);

            // if not a number
            if (parseAttempt == false)
            {
                Console.WriteLine("You have not entered a number, application will now exit.");
                Environment.Exit(0);
            }
            //if true, continue, ask for number2
            if (parseAttempt == true)
            {
                //asking for number
                Console.Write("Enter another number > ");
                tempVal = Console.ReadLine(); //storing number temporailiy for checking
                parseAttempt = Int32.TryParse(tempVal, out number2); //checking number2 if integer

                //if not a number
                if (parseAttempt == false)
                {
                    Console.WriteLine("ERROR you have not entere a valid integer");
                    Environment.Exit(0);
                }
                //if true, continue, ask for action(+*-+)
                Console.WriteLine("Action (*/+-) > ");
                action = Console.ReadLine();

                switch (action) //switch statement for action list
                {
                    case "+":
                        Console.WriteLine("Result is > ", number1 + number2);
                        break;
                    case "-":
                        Console.WriteLine("Result is > ", number1 - number2);
                        break;
                    case "*":
                        Console.WriteLine("Result is > ", number1 * number2);
                        break;
                    case "/":
                        Console.WriteLine("Result is > ", number1 / number1);
                        break;
                    default:
                        Console.WriteLine("ERROR INVALID INPUT");
                        Environment.Exit(0);
                        break;
                }
                Console.WriteLine();
            }
        }
    }
}

我试图让这个 switch 语句工作，但它不断出现错误，无法将字符串更改为字符。我没有看到我在哪里尝试将字符串更改为字符。

Answer 1

使用

action = Console.ReadKey().KeyChar;

而不是

action = Console.ReadLine();

&

大小写“+”: 到 大小写“+”: