Question

Hello i got array of string, and they are durations made by myself in format H:M:S:MS

Example strings:

0:0:4:410
0:0:1:425
0:0:1:802
0:0:1:509
0:0:1:674
0:0:1:628
0:0:2:76

How can i sum/avg/min/max values of these items in arraylist?

Arraylist name is arrayLL.

I’m new in c# so hope someone will show me how to work with strings.

The function that adds to array is:

if (Session["DT"].ToString() != "")
{
    TimeSpan ts = ((DateTime)Session["DT2"]).Subtract((DateTime)Session["DT"]);

    Session["TimeL"] = ts.Hours.ToString() + ":" 
                            + ts.Minutes.ToString() + ":"
                            + ts.Seconds.ToString() + ":" 
                            + ts.Milliseconds.ToString();
}

Answer 1

Assuming the numbers represent hours, minutes, seconds, and milliseconds you can try the following:

// Empty list you will populate:
List<int> durationsInMilliseconds = new List<int>();

// Loop through your existing data, and calculate all
// durations into milliseconds:
foreach (string word in yourDurationArray)
{
    string[] values = s.Split(':');
    int hoursAsMilliseconds = Integer.parse(values[0]) * 60 * 60 * 1000;
    int minutesAsMilliseconds = Integer.parse(values[1]) * 60 * 1000;
    int secondsAsMilliseconds = Integer.parse(values[2]) * 1000;

    int sumDurationAsMilliseconds = hoursAsMilliseconds + 
                                    minutesAsMilliseconds + 
                                    secondsAsMilliseconds + 
                                    Integer.parse(values[3]);

    durationsInMilliseconds.add(sumDurationAsMilliseconds);
}

Now you should have a list of type Integer (durationsInMilliseconds) which contains the numbers in a single comparable format. With this, you should be able to do whichever calculations you need.

(PS: If you need the result in the same format as the original input-data, you will have to add an operation for calculating back from MS into hours, minutes and seconds..)