Using stopwatch in a console application

Question

I want to make a simple stopwatch in C# console. When you press S key you start the stopwatch and Q key to stop the stopwatch. And at the end the elapsed time will show in Hours:Min:Sec. Until now the stopwatch starts but when it stops it doesnt get the elapsed time.

static void Main(string[] args)
{
    Console.WriteLine("The stopwatch, press S to begin and Q to stop");
    var UserInput = Console.ReadLine();
    System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
    stopWatch.Start();

    switch (UserInput)
    {
        case "s":
            stopWatch.Start();;
            break;
        case "q":
            stopWatch.Stop();

            break;
        default:
            Console.WriteLine("You did something wrong");
            break;
    }

    // Get the elapsed time as a TimeSpan value.
    TimeSpan ts = stopWatch.Elapsed;

    // Format and display the TimeSpan value. 
    string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
        ts.Hours, ts.Minutes, ts.Seconds,
        ts.Milliseconds / 2);
    Console.WriteLine("RunTime " + elapsedTime);

    Console.ReadLine();
}

This is the output:

https://i.sstatic.net/VKtCQ.png

Answer 1

You're missing a loop. You probably press 's' to start and when you press 'q' you're actually hitting the last Console.ReadLine()

If you add a loop, everything works:

    static void Main(string[] args)
    {
        Console.WriteLine("The stopwatch, press S to begin and Q to stop");
        System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();
        stopWatch.Start();

        var done = false;

        while (!done)
        {
            var UserInput = Console.ReadLine();

            switch (UserInput)
            {
                case "s":
                    stopWatch.Start();
                    break;
                case "q":
                    stopWatch.Stop();
                    done = true;
                    break;
                default:
                    Console.WriteLine("You did something wrong");
                    break;
            }
        }

        // Get the elapsed time as a TimeSpan value.
        TimeSpan ts = stopWatch.Elapsed;

        // Format and display the TimeSpan value. 
        string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
            ts.Hours, ts.Minutes, ts.Seconds,
            ts.Milliseconds / 2);
        Console.WriteLine("RunTime " + elapsedTime);

        Console.ReadLine();
    }

Hope this helps :)