C＃如何检查TimeOfDay是否等于指定的字符串时间

Question

Basically, I am developing a windows service and I'm asking the computer: if it is xx:xx:xx.xxx then do something.

Unfortunately I'm could not compare it to System.TimeSpan.Parse():

timer = new Timer();
this.timer.Interval = 100;
if ((DateTime.Now.TimeOfDay == System.TimeSpan.Parse("02:30:00"))) //24-Hour
{
    //do something
    this.timer.Enabled = true;
}

Also, is there a way to keep the service on watch if the the conditions are met and do the code in the if-block without a timer? or do you really need the timer.

Answer 1

You're very seldom going to line up exactly on zero milliseconds with a 100 millisecond timer interval. This will cause your comparison as given to fail. Try [DateTime]::Now.AddMilliseconds(0 - [DateTime]::Now.Millisecond).TimeOfDay for the left side of your comparison.

Also, have you considered just making this a Windows Console app and firing it using Windows Scheduled Tasks? Sometimes that's a better option than writing a service.

Answer 2

You can use Quartz.NET library which is a full-featured, open source job scheduling system that can be used from smallest apps to large scale enterprise systems. It is very useful and easy to use.

Here you can get some tutorials about this.

You can specify your desired schedule by defining a cron expression which is very flexible.

Here is some documentation of this.

Answer 3

if you saying 02:30:00 is the time in 24 format like HH:mm:ss

you can use like

if("02:30:00".Equals(DateTime.Now.ToString("HH:mm:ss"))
{
// C# code goes here if both matchs
}

update

DateTime.Now.ToString("HH:mm:ss")

this will return only hours:minutes:seconds

Answer 4

Thank you all for the answer. But, I have decided to do a ranged comparison.

timer = new Timer();
this.timer.Interval = 60000;
if(DateTime.Now.TimeOfDay >= System.TimeSpan.Parse("03:00:00") && DateTime.Now.TimeOfDay <= System.TimeSpan.Parse("03:30:00")) { //do something }