Question

There is a list called cardReaderHistory . That contains some time records in ordered fashion as follows,

InTime1
OutTime1
InTime2
OutTime2
InTime3
OutTime3
InTime4
OutTime4…..furthermore..

What I need is Calculate Working time by (OutTime1 – Intime1) + (OutTime1 – Intime1)…..
double
How could I do this in C#…????

 double hr = ((outTime1 - inTime1)+(OutTime2 - Intime2)+...);  

Thank you..
Poor Beginner

Answer 1

You can filter the input sequence based on the index, and then zip the two sequences:

var inTimes = source.Where((x, index) => index % 2 == 0);
var outTimes = source.Where((x, index) => index % 2 == 1);

var result = inTimes.Zip(outTimes, (inTime, outTime) => outTime - inTime).Sum();

If you don’t need the intermediary values, you can also do this:

var result = source.Select((x, index) => (index % 2 == 0) ? -x : x).Sum();