How to use the for loop

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Hi just beginner user in C#. Can i use for loops at below code? How can i do that?
I want to calculate for 7 days a week.

What I have tried:

C#

DateTime dt_startDay1 = Worktime_dtpicker_startDay1.Value;
DateTime dt_endDay1 = Worktime_dtpicker_endDay1.Value;
int dt_breakDay1 = Int32.Parse(Worktime_numUpDown_breakDay1.Value.ToString());

int diff_Day1 = (int)(dt_endDay1 - dt_startDay1).TotalMinutes;
int total_wtDay1 = diff_Day1 - dt_breakDay1;
label1.Text = Convert.ToString(total_wtDay1);

DateTime dt_startDay2 = Worktime_dtpicker_startDay2.Value;
DateTime dt_endDay2 = Worktime_dtpicker_endDay2.Value;
int dt_breakDay2 = Int32.Parse(Worktime_numUpDown_breakDay2.Value.ToString());

int diff_Day2 = (int)(dt_endDay2 - dt_startDay2).TotalMinutes;
int total_wtDay2 = diff_Day2 - dt_breakDay2;
label2.Text = Convert.ToString(total_wtDay2);

Posted 31-Mar-16 11:47am

Member 12421315

Updated 31-Mar-16 22:04pm

lukeer

v2

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2 solutions

Solution 2

You can, but (no offense) that's a bit more complicated than I feel you're used to. And doing it the no-loop-boring-type-it-all way would be faster anyway.

However, if you want to try it, you have to store Worktime_dtpicker_startDay1, Worktime_dtpicker_startDay2, ..., WorkTime_dtpicker_startDay7 in a list:

C#

List<datetimepicker> startPickers = new List<datetimepicker>()
{
    Worktime_dtpicker_startDay1, Worktime_dtpicker_startDay2,
    Worktime_dtpicker_startDay3, Worktime_dtpicker_startDay4,
    Worktime_dtpicker_startDay5, Worktime_dtpicker_startDay6,
    Worktime_dtpicker_startDay7
}

Same for the end time pickers. And again the same for the break UpDowns. And for the result labels.
Then, you can

C#

for(int i = 0; i < 7; i++)
{
    int minutes = (int)((endPickers[i] - startPickers[i]).TotalMinutes);
    minutes -= breakUpDowns[i].Value;
    resultLabels[i].Value = minuts.ToString();
}

---------------------------------------------------------------
Level 2:
Totally not what you were asking, but read up on UserControls and create one that includes pickers and label. Then use 7 of them instead of all the individual controls. Calculate result within the usercontrol on every input change. No need for a loop at all, but gives a very responsive UI.

Posted 31-Mar-16 22:04pm

lukeer

Updated 31-Mar-16 23:06pm

v2

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OriginalGriff · Accepted Answer · 2016-03-31T11:57:00

Not really - a loop is good at doing "the same stuff over and over", but it needs to work with something that iterates; something that goes up or down by the same amount each time round.
And your code doesn't do that it - just accesses variables with names that change, which is very different.
Instead, I'd write a method which accepted two DateTime values and an integer, and returned an integer of string result. That way, you don't repeat the same code, just pass the different values, and store the result in the right place.