Calculate difference between 2 datetimes (Timespan + double)

Question

I have a list that holds Datetimes.

To calculate the difference between 2 DateTime i use TimeSpan.

public static List<DateTime> list = new List<DateTime>();
TimeSpan ts = new TimeSpan();
double result = 0;

ts = DateTime.Now - list[list.Count-1];
result = ts.TotalSeconds;

When debugging this code both the DateTime.Now and the list[list.Count-1] have DateTimes where the DateTime.Now is off course higher then the value of the list.

But for some reason i keep getting 0 in the variable result, how come exactly?

Best regards, Pete

Answer 1

I just tried the following, works perfectly okay.

            List<DateTime> list = new List<DateTime>();
            list.Add(DateTime.Now.AddDays(-1));
            list.Add(DateTime.Now);
            list.Add(DateTime.Now.AddDays(1));
            TimeSpan ts = new TimeSpan();
            double result = 0;

            ts = DateTime.Now - list[list.Count - 1];
            result = ts.TotalSeconds;

Attached the debbuging picture:

Reasons for not working could be:

1. Either your list is not being populated
2. Or the value of ts.TotalSeconds is smaller than double range (Which can be practically not possible.)

Answer 2

First comment, you don't need = new TimeSpan(); - you're only discarding this anyway when you set ts again further down.

What line is your debugger on when you see the value of 0 for result? Have you stepped over the line where result is set? If you are on the line, then that line has not yet actually run...