What's wrong with getting ticks?

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Below is a snippet of my codes for getting time ticks.

DateTime now = DateTime.Now;
// A double-click is detected if the the time elapsed
// since the last click is within DoubleClickTime.
string lines = "" + (now.Ticks - previousClick.Ticks);
System.IO.StreamWriter file = new System.IO.StreamWriter(@"e:\tmp0\test.txt", true);
file.WriteLine(lines);
file.Close();
if ((now.Ticks - previousClick.Ticks) <= 10000 * (SystemInformation.DoubleClickTime))
{
    // Raise the DoubleClick event.
    if (DoubleClick != null)
    {
        //MessageBox.Show("raise double click");
        DoubleClick(this, EventArgs.Empty);
    }
}
// Set previousClick to now so that
// subsequent double-clicks can be detected.
previousClick = now;

This section of codes are executed once for my each clicking. No matter how quick I click, I got very big tick difference between two clicks, as below. What's wrong with it? In my mind, I expect each difference should be just 1000 or so at most because its unit it milisecond.

635581521847201967
31031775
16800961
16720956
18001030

Posted 28-Jan-15 23:19pm

Stan Huang

Updated 29-Jan-15 14:56pm

v2

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Comments

Leo Chapiro 29-Jan-15 5:28am

I cann't see where you set the previousClick.Ticks variable like: previousClick.Ticks = now.Ticks. Can you show this part of your code please?

BillWoodruff 29-Jan-15 8:24am

The unit of a 'tick is not a millisecond:

"A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond, or 10 million ticks in a second."

Stan Huang 29-Jan-15 20:57pm

What BillWoodruff said is right.
_duDE_, I updated the codes which contains the statement you expect. The original codes is to simulate a double-click on picture box by single click.

2 solutions

Solution 2

I just tried it myself
Yes, I get same result: no matter how fast I type there is a limit.
This is probably due to the fact the OS has many processes and switches between tasks.
Otherwise we could not have multi-tasking on our computers.

static void Main(string[] args)
        {
            Console.WriteLine("DoubleClickTime = " + SystemInformation.DoubleClickTime.ToString());
            long ticks = 0;
            DateTime previous = DateTime.Now;
            char c = (char)0;
            while((c=Console.ReadKey().KeyChar)!='q')
            {
                DateTime now = DateTime.Now;
                ticks = now.Ticks - previous.Ticks;
                Console.WriteLine(": Ticks= {0}", ticks);
                previous = now;
            }
            Console.ReadKey();
        }

Posted 29-Jan-15 15:36pm

BacchusBeale

Comments

Stan Huang 30-Jan-15 0:20am

As previously said by BillWoodruff, one second is 10 millions ticks. That's the reason why no matter how fast you typed, the number looks very big.

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Richard MacCutchan · Accepted Answer · 2015-01-28T23:36:00

Solution 1

See https://msdn.microsoft.com/en-us/library/system.datetime.ticks(v=vs.110).aspx[^].

Posted 28-Jan-15 23:36pm

Richard MacCutchan