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c#loopsvalidationcmd
Ryan W
Ryan W

Reputation: 39

C# CMD input validation

I'm trying to make it so that when a number is entered my program will not crash, which this does so far. Then I want it to re ask for an input until the correct charcter type is enetered. 

int firstNum;
int Operation = 0;

   switch(Operation)
   {
        case 1:
            bool firstNumBool = int.TryParse(Console.ReadLine(), out firstNum);
         break;
   }

Upvotes: 0

Views: 129

Answers (1)

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186843

Decompose your solution; extract a method for inputing an integer:

 private static int ReadInteger(string title) {
   // Keep on asking until correct input is provided
   while (true) {
     if (!string.IsNullOrWhiteSpace(title))
       Console.WriteLine(title);

     if (int.TryParse(Console.ReadLine(), out int result))
       return result;

     Console.WriteLine("Sorry, not a valid integer value; please, try again.");
   }
 }

And then use it:

 int firstNum;

 ...

 switch(Operation)
 {
      case 1:
          firstNum = ReadInteger("First number");
          break;

      ...

Upvotes: 2

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