CODEWITHSUNDEEP
c#switch-statement
Drinu89
Drinu89

Reputation: 43

Can you add a validation to a switch?

I know this might be a simple question but how can I add validation to this switch statement. I want that if the user inputs a different number than 1,2 or 3 an error message will be displayed.

        Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-=-");
        Console.WriteLine("    1. Create Account      ");
        Console.WriteLine("    2.     Login           ");
        Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-=-");

        string userChoice = Console.ReadLine();



        switch (userChoice)
        {
            case "1":
                Console.Clear();
                cl_class.CreateAccount();
                DisplayMenu();
                Console.ReadKey();
                break;
            case "2":
                Console.Clear();
                Login();
                DisplayMenu();
                Console.ReadKey();
                break;

        }

Upvotes: 0

Views: 286

Answers (1)

Broots Waymb
Broots Waymb

Reputation: 4826

You want the default keyword.
Use it after your last case (order doesn't technically matter, per the documentation at the link below, but you'd have a hard time convincing me to not put it last - it's just common practice). 

switch (userChoice)
{
    case "1":
        Console.Clear();
        cl_class.CreateAccount();
        DisplayMenu();
        Console.ReadKey();
        break;
    case "2":
        Console.Clear();
        Login();
        DisplayMenu();
        Console.ReadKey();
        break;
    default:
        //Display error stuff
}

I left out a case for 3, since you did not include one in your example. If you want default to not catch "3", obviously just add that as a new case above the default.

More info here: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/switch#the-default-case

Upvotes: 6

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