I am using Visual Basic 2005.
I have created a two dimensional ArrayList named aSystem that is populated as
follows:-
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
and then other items are added to the ArrayList from a sorted recordset as
follows:-
Do Until ssTemp.EOF
aSystem.Add(New PickList(ssTemp .Fields("Primar yKey").Value, _
ssTemp.Fields(" Name").Value))
ssTemp.MoveNext ()
Loop
The structure of the PickList class is as follows:-
Public Structure PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Structure
I use the ArrayList to populate a ComboBox
With cboSystem
.DataSource = aSystem
.ValueMember = "PrimaryKey "
.DisplayMember = "ID"
End With
For the most part everything works fine; the ComboBox is populated with all
the data.
I have two problems...
1. I can't seem to read the items from the ArrayList directly. I would
expect to be
able to read the array something like this:
aSystem.Item(1)
but all I get back is:_
MagCalculator.P ickList: {MagCalculator. PickList} where
where MagCalculator is the name of the application.
How do I read the individual items of the two-dimensional ArrayList?
2. I want to sort the ArrayList but although there is an abundance of
information in MSDN on how to sort a one-dimensional ArrayList, there is no
information on how to sort a two-dimensional ArrayList.
As mentioned already, I subsequently populate a ComboBox with the two
dimensional ArrayList, and this seems to work fine except of course the list
isn't sorted.
If anyone could point me in the right direction, I'd be grateful.
3  6963 
Hi Stuat,
I think you are mislead by the idea that there exists such a thing like
a "bidimensio nal" arraylist.
Here an example for your tasks. YOu can change the property being
compared
according to your needs.
-Tommaso
Public Class Form1
Inherits System.Windows. Forms.Form
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim aSystem As New ArrayList
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
'1.Get items
Dim FirstPickList As PickList = DirectCast(aSys tem(0),
PickList)
With FirstPickList
Dim id As String = .ID
Dim PrimaryKey As Integer = .PrimaryKey
End With
'2.Sort Items
aSystem.Sort(Ne w ComparerForPick List)
End Sub
Class ComparerForPick List
Implements IComparer
Public Function Compare(ByVal x As Object, ByVal y As Object)
As Integer Implements System.Collecti ons.IComparer.C ompare
Dim PickList1 As PickList = DirectCast(x, PickList)
Dim PickList2 As PickList = DirectCast(y, PickList)
Return String.Compare( PickList1.ID, PickList2.ID)
End Function
End Class
Public Class PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Class
End Class
Stuart ha scritto:
I am using Visual Basic 2005.
I have created a two dimensional ArrayList named aSystem that is populated as
follows:-
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
and then other items are added to the ArrayList from a sorted recordset as
follows:-
Do Until ssTemp.EOF
aSystem.Add(New PickList(ssTemp .Fields("Primar yKey").Value, _
ssTemp.Fields(" Name").Value))
ssTemp.MoveNext ()
Loop
The structure of the PickList class is as follows:-
Public Structure PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Structure
I use the ArrayList to populate a ComboBox
With cboSystem
.DataSource = aSystem
.ValueMember = "PrimaryKey "
.DisplayMember = "ID"
End With
For the most part everything works fine; the ComboBox is populated with all
the data.
I have two problems...
1. I can't seem to read the items from the ArrayList directly. I would
expect to be
able to read the array something like this:
aSystem.Item(1)
but all I get back is:_
MagCalculator.P ickList: {MagCalculator. PickList} where
where MagCalculator is the name of the application.
How do I read the individual items of the two-dimensional ArrayList?
2. I want to sort the ArrayList but although there is an abundance of
information in MSDN on how to sort a one-dimensional ArrayList, there is no
information on how to sort a two-dimensional ArrayList.
As mentioned already, I subsequently populate a ComboBox with the two
dimensional ArrayList, and this seems to work fine except of course the list
isn't sorted.
If anyone could point me in the right direction, I'd be grateful.
Hi Stuart,
I think you are mislead by the idea that there exists such a thing like
a "bidimensio nal" arraylist.
Here an example for your tasks. YOu can change the property being
compared according to your needs.
-Tommaso
Public Class Form1
Inherits System.Windows. Forms.Form
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim aSystem As New ArrayList
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
'1.Get items
Dim FirstPickList As PickList = DirectCast(aSys tem(0),
PickList)
With FirstPickList
Dim id As String = .ID
Dim PrimaryKey As Integer = .PrimaryKey
End With
'2.Sort Items
aSystem.Sort(Ne w ComparerForPick List)
End Sub
Class ComparerForPick List
Implements IComparer
Public Function Compare(ByVal x As Object, ByVal y As Object)
As Integer Implements System.Collecti ons.IComparer.C ompare
Dim PickList1 As PickList = DirectCast(x, PickList)
Dim PickList2 As PickList = DirectCast(y, PickList)
Return String.Compare( PickList1.ID, PickList2.ID)
End Function
End Class
Public Class PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Class
End Class
Stuart ha scritto:
I am using Visual Basic 2005.
I have created a two dimensional ArrayList named aSystem that is populated as
follows:-
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
and then other items are added to the ArrayList from a sorted recordset as
follows:-
Do Until ssTemp.EOF
aSystem.Add(New PickList(ssTemp .Fields("Primar yKey").Value, _
ssTemp.Fields(" Name").Value))
ssTemp.MoveNext ()
Loop
The structure of the PickList class is as follows:-
Public Structure PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Structure
I use the ArrayList to populate a ComboBox
With cboSystem
.DataSource = aSystem
.ValueMember = "PrimaryKey "
.DisplayMember = "ID"
End With
For the most part everything works fine; the ComboBox is populated with all
the data.
I have two problems...
1. I can't seem to read the items from the ArrayList directly. I would
expect to be
able to read the array something like this:
aSystem.Item(1)
but all I get back is:_
MagCalculator.P ickList: {MagCalculator. PickList} where
where MagCalculator is the name of the application.
How do I read the individual items of the two-dimensional ArrayList?
2. I want to sort the ArrayList but although there is an abundance of
information in MSDN on how to sort a one-dimensional ArrayList, there is no
information on how to sort a two-dimensional ArrayList.
As mentioned already, I subsequently populate a ComboBox with the two
dimensional ArrayList, and this seems to work fine except of course the list
isn't sorted.
If anyone could point me in the right direction, I'd be grateful.
Thanks Pamela.
Wow! That was quick!
....and it worked. I would never had figured it out myself. You're a star.
Stuart
"pa***********@ libero.it" wrote:
Hi Stuat,
I think you are mislead by the idea that there exists such a thing like
a "bidimensio nal" arraylist.
Here an example for your tasks. YOu can change the property being
compared
according to your needs.
-Tommaso
Public Class Form1
Inherits System.Windows. Forms.Form
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim aSystem As New ArrayList
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
'1.Get items
Dim FirstPickList As PickList = DirectCast(aSys tem(0),
PickList)
With FirstPickList
Dim id As String = .ID
Dim PrimaryKey As Integer = .PrimaryKey
End With
'2.Sort Items
aSystem.Sort(Ne w ComparerForPick List)
End Sub
Class ComparerForPick List
Implements IComparer
Public Function Compare(ByVal x As Object, ByVal y As Object)
As Integer Implements System.Collecti ons.IComparer.C ompare
Dim PickList1 As PickList = DirectCast(x, PickList)
Dim PickList2 As PickList = DirectCast(y, PickList)
Return String.Compare( PickList1.ID, PickList2.ID)
End Function
End Class
Public Class PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Class
End Class
Stuart ha scritto:
I am using Visual Basic 2005.
I have created a two dimensional ArrayList named aSystem that is populated as
follows:-
aSystem.Add(New PickList(0, "Undefined" ))
aSystem.Add(New PickList(-1, "Standard UTM"))
aSystem.Add(New PickList(-2, "UTM-NAD83"))
aSystem.Add(New PickList(-3, "UTM-NAD27"))
and then other items are added to the ArrayList from a sorted recordset as
follows:-
Do Until ssTemp.EOF
aSystem.Add(New PickList(ssTemp .Fields("Primar yKey").Value, _
ssTemp.Fields(" Name").Value))
ssTemp.MoveNext ()
Loop
The structure of the PickList class is as follows:-
Public Structure PickList
Private mnPrimaryKey As Integer
Private msID As String
Public Sub New(ByVal PrimaryKey As Integer, ByVal ID As String)
mnPrimaryKey = PrimaryKey
msID = ID
End Sub
Public ReadOnly Property PrimaryKey() As Integer
Get
Return mnPrimaryKey
End Get
End Property
Public ReadOnly Property ID() As String
Get
Return msID
End Get
End Property
End Structure
I use the ArrayList to populate a ComboBox
With cboSystem
.DataSource = aSystem
.ValueMember = "PrimaryKey "
.DisplayMember = "ID"
End With
For the most part everything works fine; the ComboBox is populated with all
the data.
I have two problems...
1. I can't seem to read the items from the ArrayList directly. I would
expect to be
able to read the array something like this:
aSystem.Item(1)
but all I get back is:_
MagCalculator.P ickList: {MagCalculator. PickList} where
where MagCalculator is the name of the application.
How do I read the individual items of the two-dimensional ArrayList?
2. I want to sort the ArrayList but although there is an abundance of
information in MSDN on how to sort a one-dimensional ArrayList, there is no
information on how to sort a two-dimensional ArrayList.
As mentioned already, I subsequently populate a ComboBox with the two
dimensional ArrayList, and this seems to work fine except of course the list
isn't sorted.
If anyone could point me in the right direction, I'd be grateful.
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