C# Times

[Illegal Operation]

Hi! I have a problem. I have created a time sheet system that enables a person to enter a start time and an end time. It then calculates the total hours worked. The problem I have is this: When a person has been on lunch from say 11:00 to 11:30 and then wants to enter a time worked say 11:15 then an exception should be thrown stating that times cannot overlap. How will I go about checking for this? Thanks in advance!!

Illegal Operation

[Luc Pattyn]

two intervals [b1,e1] and [b2,e2] overlap when any of the following is true:

b1<=b2<=e1
b1<=e2<=e1
b2<=b1<=e2
b2<=e1<=e2

So start comparing begin and end DateTimes. :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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modified on Sunday, February 28, 2010 8:15 PM

[David Skelly]

If you google for c# DateRange you will find a number of classes that people have written to address this sort of problem, i.e. dealing with fixed periods of time and testing for intersection with other periods, and so on. One example is here: http://noticeablydifferent.com/CodeSamples/DateRange.aspx[^] This example is OK, except I would make it immutable since in its present form it's not thread-safe.