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ASP.net dateADD help

Answer 1

+1 A:

As you may have noticed, the output only goes to 2010 (10/2/2010) which should go all the way to 12/31/2011.

It stops when dtTempNow > dtTempEnd is no longer True. Plus, you might be interesting in String.Format

It should start out like so:

2008 Period 13: Nov 30 - Dec 27

Why? You set nTemp to 1 at the start, why should it start at 13?

GôTô 2010-10-06 15:33:32

Answer 2

+1 A:

I would create an object to hold your data, similar to this

Public Class Period
    Public Property Period As Integer
    Public Property StartOfPeriod As Date
    Public Property EndOfPeriod As Date
End Class

Then for each iteration of the While loop I would enter the values as list(of Period), once your code has process, use a linq query to sort the data use Period and Date, then bind the list to the drop down.

Hope this helps

Iain 2010-10-06 15:35:22

Answer 3

+1 A:

There is a lot I would change (including using Iain's class for representing the period), and recognizing that nTemp needs to start at 13 for this example and the list is stopping because the loop was told to break at DateTime.Now for no apparent reason, eventhough you said it should continue to run to the end of 2011. But here is how to make the code you posted work:

Dim dt2009Start As DateTime
    Dim dtTempStart, dtTempEnd As DateTime
    Dim dtTempNow As DateTime
    Dim nTemp As Integer
    Dim itemPeriod As ListItem
    Dim timesAround As Integer
    Dim dtReallyEnd As DateTime
    Dim year As Integer

    year = 2008
    dt2009Start = Convert.ToDateTime("11/30/2008")
    dtTempStart = dt2009Start
    dtTempEnd = dtTempStart.AddDays(27)
    dtReallyEnd = Convert.ToDateTime("12/31/2011")


    dtTempNow = DateTime.Now()
    nTemp = 13
    timesAround = 0

    While (dtReallyEnd > dtTempEnd)
       If nTemp = 14 Then
           nTemp = 1
            timesAround += 1
            year += 1
        End If


        itemPeriod = New ListItem()
        itemPeriod.text = year.ToString() & " Period " & nTemp.ToString() & ": " & dtTempStart.Date.ToShortDateString() & " - " & dtTempEnd.Date.ToShortDateString()
        itemPeriod.value = dtTempStart.Date.ToShortDateString() & "-" & dtTempEnd.Date.ToShortDateString()
        ddlInvoicePeriods.Items.Add(itemPeriod)
        itemPeriod = Nothing

        Debug.Print(dtTempStart.Date.Year.ToString() & " Period " & nTemp.ToString() & ": " & dtTempStart.Date.ToShortDateString() & " - " & dtTempEnd.Date.ToShortDateString())

        dtTempStart = dtTempEnd.AddDays(1)
        dtTempEnd = dtTempStart.AddDays(27)
        nTemp += 1
    End While

    If nTemp = 14 Then
        nTemp = 1
        timesAround += 1
        year += 1
    End If

    itemPeriod = New ListItem
    itemPeriod.text = dtTempStart.Date.Year.ToString() & " Period " & nTemp.ToString() & ": " & dtTempStart.Date.ToShortDateString() & " - " & dtTempEnd.Date.ToShortDateString()
    itemPeriod.value = dtTempStart.Date.ToShortDateString() & "-" & dtTempEnd.Date.ToShortDateString()
    ddlInvoicePeriods.Items.Add(itemPeriod)
    itemPeriod = Nothing

I would still probably make the end date more dynamic (so you don't have to change code in the future when you want more Periods to show) and the start date might be dynamic as well (to keep the list at a manageable length).

ben f. 2010-10-06 16:48:54

That worked the way i needed it too! With less code than i have! Thanks ben! :o)

StealthRT 2010-10-06 16:56:22

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