在C#上再次运行该函数 [英] Running the function again on C#

问题描述

我有一个带有switch的简单代码.问题是在任何情况下完成或在默认情况下终止了代码.我想得到的是，完成后会问您想重复一次"这个问题，如果答案是Y，它将再次运行Main，如果它是N，则将终止，依此类推.我尝试过do ...同时又没有其他建议吗?

I have this simple code with switch. The thing is that after any case completed or after default the code is terminated. What I want to get that after completion it would ask the question "Would you like to repeat" and if answer is Y it would run the Main again and it is N it would terminate then and so on. I tried with do...while and no luck any other suggestions?

我确信它应该看起来像这样:

I am sure it should look something like this:

Console.WriteLine("Would you like to repeat? Y/N");

input = Console.ReadKey().KeyChar;

if (input == 'Y') {...}

代码:

class Switch
{
    static void Main()
    {
        Console.Write("Enter your selection (1, 2, or 3): ");
        string s = Console.ReadLine();
        int n = Int32.Parse(s);

        switch (n)
        {
            case 1:
                Console.WriteLine("Current value is {0}", 1);
                break;
            case 2:
                Console.WriteLine("Current value is {0}", 2);
                break;
            case 3:
                Console.WriteLine("Current value is {0}", 3);
                break;
            default:
                Console.WriteLine("Sorry, invalid selection.");
                break;
        }

        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    }
}

.

推荐答案

让我们简化问题:提取方法:

   private static void MyRoutine() {
     Console.Write("Enter your selection (1, 2, or 3): "); 

     String input = Console.ReadLine();
     int n = 0;

     // User Input validation: we want integer value (int.TryParse) in the desired rang
     if (!int.TryParse(input, out n)) {
       Console.WriteLine("Sorry, invalid selection. Integer value expected");  

       return;
     }
     else if (n < 1 || n > 3) {
       Console.WriteLine("Sorry, invalid selection. Range of 1..3 expected.");

       return;         
     } 

     // n is valid
     switch (n) {
       case 1:
         Console.WriteLine("Current value is {0}", 1);
         break;
       case 2:
         Console.WriteLine("Current value is {0}", 2);
         break;
       case 3:
         Console.WriteLine("Current value is {0}", 3);
         break;
     }
   }

现在我们准备继续运行例程( repeat 通常是一个 loop ；这里我们有 do..while ):

Now we are ready to keep on running the routine (repeat is usually a loop; here we have do..while):

   static void Main() {
     do {
       MyRoutine();

       Console.WriteLine("Would you like to repeat? Y/N");
     }
     while (char.ToUpper(Console.ReadKey().KeyChar) == 'y');

     Console.WriteLine("Press any key to exit.");
     Console.ReadKey();
   }  

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