C# 时间操作

1. Show current time

2. Calculate execution time

Use StopWatch classs, which locates in System.Diagnostics namespace.

static void Main(string[] args)
{
    Stopwatch s1 = new Stopwatch();
    s1.Start();
    Thread.Sleep(891);
    s1.Stop();
    Display(s1);

    s1.Restart();
    Thread.Sleep(100);
    s1.Stop();
    Display(s1);

    if (Stopwatch.IsHighResolution)
        Console.WriteLine("High Resolution");
    else
        Console.WriteLine("Not High Resolution");

    Console.WriteLine(Stopwatch.Frequency);
}

static void Display(Stopwatch s1)
{
    Console.WriteLine(s1.ElapsedMilliseconds);
    Console.WriteLine(s1.ElapsedTicks);
    TimeSpan sp1 = s1.Elapsed;
    Console.WriteLine(string.Format("{0:00}:{1:00}:{2:00}.{3:00}", sp1.Hours,
                                                                   sp1.Minutes,
                                                                   sp1.Seconds,
                                                                   sp1.Milliseconds / 10));
}