Index is ouside the bounds of the array

Hi Guys,

Another error and I'm not sure where it is comming from:

Code:

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Structure structHours
    Dim StdHours As Integer
    Dim OvHours As Integer
    Dim TotHours As Integer
End Structure


Dim arHours(i) As structHours

 Private Sub CalculateHoursSub()


        'Defining Local Subroutine variables
        Dim intOverTimeHours As Integer                'Holds overtime hours during this subroutine
        Dim intStandardHours As Integer                'Holds standard hours during this subroutine

        'This subroutine takes the entered number of hours, calculates the no of standard and over time
        'hours, puts them into arrays, and updates variables for the totals of these hours for use in
        'the frmEmployeePayeDetails and frmCalculatedMonthlyPaye.

        'Adds 1 to the NoOfDaysCounter, makes the UndoLastEntry button visiable after the
        'first value has been entered and reads the hours entered from the text box into variable.

        intNoOfDaysCounter = intNoOfDaysCounter + 1
        Me.UndoButton.Enabled = True
        intEnteredHours = CInt(Me.NoOfHoursTextBox.Text)

        'This if statement sets the variables for the amount standard and over time hours
        If intEnteredHours > 8 Then
            intStandardHours = 8
            intOverTimeHours = (intEnteredHours - intStandardHours)

        Else
            intStandardHours = intEnteredHours
            intOverTimeHours = 0
        End If


        'Adds the values above to the listview

        Dim LVItems As New ListViewItem
        LVItems.Text = CStr(intStandardHours)
        LVItems.SubItems.Add(CStr(intOverTimeHours))
        LVItems.SubItems.Add(CStr(intEnteredHours))
        Me.EnteredHoursListView.Items.Add(LVItems)

        'Puts the hours variables into an array

        arHours(nIndexItems).StdHours = intStandardHours
        arHours(nIndexItems).OvHours = intOverTimeHours
        arHours(nIndexItems).TotHours = intEnteredHours


        'Adds standard and overtime variables for this entry to the running total of hours

        intTotalHours = intTotalHours + intEnteredHours
        intTotalStandardHours = intTotalStandardHours + intStandardHours
        intTotalOvertTimeHours = intTotalOvertTimeHours + intOverTimeHours


        'Resets hours entry box

        Me.NoOfHoursTextBox.Clear()
        Me.NoOfHoursTextBox.Text = "0"


        If intNoOfDaysCounter <> intNoOfDays + 1 Then
            'Adds one to the nhours variable used to track the current line of the array
            nIndexItems = nIndexItems + 1
            intUndo = nIndexItems
            'Updates the day text box and sets focus on EnteredHoursTextBox
            Me.DayLabel.Text = CStr(intNoOfDaysCounter)
            Me.NoOfHoursTextBox.Focus()

        Else
            MsgBox("You have enter the required number of days. Please close the form to continue")
            Me.NoOfHoursTextBox.Enabled = False
            Me.AcceptButton.Enabled = False

        End If

    End Sub

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When I push the button the first time this works fine. When I do it a second time I get the error:

Index is ouside the bounds of the array

Hovering over where the code breaks down:

Code:

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arHours(nIndexItems).StdHours = intStandardHours

---

shows that the index value is currently 1. Howevering over i in :

Code:

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Dim arHours(i) As structHours

---

Shows i to have a value of 30. Where is this errors comming from?

Can you provide some more details, like how are you initializing your array? You declare it with an indefinite number (i). You usually initialize an array with a definite number of items, or reset it with the ReDim statement. Based on your info you are initializing the array with 30 structHours objects. And then if you could show how you are iterating through the array would also be helpful.

Why can't you use a typed collection? Much simpler to work with:

vb Code:

' Create your structure.
Public Structure StructHours
    Public myHours1 As Integer
    Public overtime As Integer
    Public salary As Double
End Structure
 
' Then create the collection, such as a Dictionary.
        Dim coll1 As New Collections.Generic.Dictionary(Of Integer, StructHours)
        Dim hours As New StructHours
        hours.myHours1 = 10
        hours.overtime = 20
        hours.salary = 100.233
        coll1.Add(1, hours)

And to extract the values:

vb Code:

For Each kvp As KeyValuePair(Of Integer, StructHours) In coll1
            ' Do other work with kvp collection...
            If kvp.Key = 12 Then
 
            End If
        Next

You would normally just access the collection using your Key value. And this Key value again can be any object, String, Integer, etc.

This is a much better way of organising an array. It's type safe and will improve performance and reduce the amount of stress when things go wrong.