when Guards

Use when to add additional conditions to a case.

Code

int number = 15;
switch (number)
{
    case int n when n < 10:
        Console.WriteLine("Less than 10");
        break;
    case int n when n >= 10 && n <= 20:
        Console.WriteLine("Between 10 and 20");
        break;
    default:
        Console.WriteLine("Other");
        break;
}

Run the Application

dotnet run

Result

Between 10 and 20