I tried to use a datasource with a combobox and it didn't work completely so
I build a small test that was much more straight forward then the app.
The test was to see if the combobox dropdown list displayed the correct
data.
However, although the designer shows the combobox the combobox does not
show at runtime.
If you would be so kind as to cut the code below and paste it into a form
maybe you can easily see why the combobox does not display.
Thanks
Public Class Form1
Inherits System.Windows. Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagnos tics.DebuggerNo nUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Disp ose()
End If
MyBase.Dispose( disposing)
End Sub
Friend WithEvents ComboBox1 As WindowsApplicat ion1.StringWith IntegerComboBox
'Required by the Windows Form Designer
Private components As System.Componen tModel.IContain er
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Private Sub InitializeCompo nent()
Me.ComboBox1 = New WindowsApplicat ion1.StringWith IntegerComboBox
Me.SuspendLayou t()
'
'ComboBox1
'
Me.ComboBox1.Lo cation = New System.Drawing. Point(136, 139)
Me.ComboBox1.Na me = "ComboBox1"
Me.ComboBox1.Si ze = New System.Drawing. Size(235, 21)
Me.ComboBox1.Ta bIndex = 0
'
'Form1
'
Me.AutoScaleDim ensions = New System.Drawing. SizeF(6.0!, 13.0!)
Me.AutoScaleMod e = System.Windows. Forms.AutoScale Mode.Font
Me.ClientSize = New System.Drawing. Size(572, 341)
Me.Controls.Add (Me.ComboBox1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout (False)
End Sub
End Class
Public Class StringWithInteg erComboBox
Inherits System.Windows. Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMembe r = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteg er("One", 1))
myList.Add(New StringWithInteg er("Two", 2))
myList.Add(New StringWithInteg er("Three", 3))
End Sub
Public myList As List(Of StringWithInteg er) = New List(Of StringWithInteg er)
End Class
Public Class StringWithInteg er
Private mInteger As Integer
Private mString As String
Private mToStringDispla ysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteg er
Clone = New StringWithInteg er(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDispla ysInteger Then
ToString = CStr(mInteger)
Else
ToString = mString
End If
End Function
Public Property Str() As String
Get
Str = mString
End Get
Set(ByVal text As String)
mString = text
End Set
End Property
Public Property ToStringDisplay sSingle() As Boolean
Get
ToStringDisplay sSingle = mToStringDispla ysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDispla ysInteger = displayInteger
End Set
End Property
Public Property Value() As Integer
Get
Value = mInteger
End Get
Set(ByVal numb As Integer)
mInteger = numb
End Set
End Property
End Class
5  1506 
Sorry don't have access to VS but it seems that you are adding the entries
after you bind the list to the combobox. Try it the other way or refresh
the combobox after you add the entries. I don't think that adding will
automatically cause the control to know there are entries. When you bound
the list was empty.
Lloyd Sheen
" active" <ac********** @a-znet.comwrote in message
news:ef******** *****@TK2MSFTNG P05.phx.gbl...
>I tried to use a datasource with a combobox and it didn't work completely
so I build a small test that was much more straight forward then the app.
The test was to see if the combobox dropdown list displayed the correct
data.
However, although the designer shows the combobox the combobox does not
show at runtime.
If you would be so kind as to cut the code below and paste it into a form
maybe you can easily see why the combobox does not display.
Thanks
Public Class Form1
Inherits System.Windows. Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagnos tics.DebuggerNo nUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Disp ose()
End If
MyBase.Dispose( disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplicat ion1.StringWith IntegerComboBox
'Required by the Windows Form Designer
Private components As System.Componen tModel.IContain er
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Private Sub InitializeCompo nent()
Me.ComboBox1 = New WindowsApplicat ion1.StringWith IntegerComboBox
Me.SuspendLayou t()
'
'ComboBox1
'
Me.ComboBox1.Lo cation = New System.Drawing. Point(136, 139)
Me.ComboBox1.Na me = "ComboBox1"
Me.ComboBox1.Si ze = New System.Drawing. Size(235, 21)
Me.ComboBox1.Ta bIndex = 0
'
'Form1
'
Me.AutoScaleDim ensions = New System.Drawing. SizeF(6.0!, 13.0!)
Me.AutoScaleMod e = System.Windows. Forms.AutoScale Mode.Font
Me.ClientSize = New System.Drawing. Size(572, 341)
Me.Controls.Add (Me.ComboBox1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout (False)
End Sub
End Class
Public Class StringWithInteg erComboBox
Inherits System.Windows. Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMembe r = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteg er("One", 1))
myList.Add(New StringWithInteg er("Two", 2))
myList.Add(New StringWithInteg er("Three", 3))
End Sub
Public myList As List(Of StringWithInteg er) = New List(Of
StringWithInteg er)
End Class
Public Class StringWithInteg er
Private mInteger As Integer
Private mString As String
Private mToStringDispla ysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteg er
Clone = New StringWithInteg er(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDispla ysInteger Then
ToString = CStr(mInteger)
Else
ToString = mString
End If
End Function
Public Property Str() As String
Get
Str = mString
End Get
Set(ByVal text As String)
mString = text
End Set
End Property
Public Property ToStringDisplay sSingle() As Boolean
Get
ToStringDisplay sSingle = mToStringDispla ysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDispla ysInteger = displayInteger
End Set
End Property
Public Property Value() As Integer
Get
Value = mInteger
End Get
Set(ByVal numb As Integer)
mInteger = numb
End Set
End Property
End Class
Sorry, I lost the New sub when I copied.
Works Ok with it.
" active" <ac********** @a-znet.comwrote in message
news:ef******** *****@TK2MSFTNG P05.phx.gbl...
>I tried to use a datasource with a combobox and it didn't work completely
so I build a small test that was much more straight forward then the app.
The test was to see if the combobox dropdown list displayed the correct
data.
However, although the designer shows the combobox the combobox does not
show at runtime.
If you would be so kind as to cut the code below and paste it into a form
maybe you can easily see why the combobox does not display.
Thanks
Public Class Form1
Inherits System.Windows. Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagnos tics.DebuggerNo nUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Disp ose()
End If
MyBase.Dispose( disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplicat ion1.StringWith IntegerComboBox
'Required by the Windows Form Designer
Private components As System.Componen tModel.IContain er
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Private Sub InitializeCompo nent()
Me.ComboBox1 = New WindowsApplicat ion1.StringWith IntegerComboBox
Me.SuspendLayou t()
'
'ComboBox1
'
Me.ComboBox1.Lo cation = New System.Drawing. Point(136, 139)
Me.ComboBox1.Na me = "ComboBox1"
Me.ComboBox1.Si ze = New System.Drawing. Size(235, 21)
Me.ComboBox1.Ta bIndex = 0
'
'Form1
'
Me.AutoScaleDim ensions = New System.Drawing. SizeF(6.0!, 13.0!)
Me.AutoScaleMod e = System.Windows. Forms.AutoScale Mode.Font
Me.ClientSize = New System.Drawing. Size(572, 341)
Me.Controls.Add (Me.ComboBox1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout (False)
End Sub
End Class
Public Class StringWithInteg erComboBox
Inherits System.Windows. Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMembe r = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteg er("One", 1))
myList.Add(New StringWithInteg er("Two", 2))
myList.Add(New StringWithInteg er("Three", 3))
End Sub
Public myList As List(Of StringWithInteg er) = New List(Of
StringWithInteg er)
End Class
Public Class StringWithInteg er
Private mInteger As Integer
Private mString As String
Private mToStringDispla ysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteg er
Clone = New StringWithInteg er(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDispla ysInteger Then
ToString = CStr(mInteger)
Else
ToString = mString
End If
End Function
Public Property Str() As String
Get
Str = mString
End Get
Set(ByVal text As String)
mString = text
End Set
End Property
Public Property ToStringDisplay sSingle() As Boolean
Get
ToStringDisplay sSingle = mToStringDispla ysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDispla ysInteger = displayInteger
End Set
End Property
Public Property Value() As Integer
Get
Value = mInteger
End Get
Set(ByVal numb As Integer)
mInteger = numb
End Set
End Property
End Class
This test case works OK, but my app doesn't.
I'll try what you suggested on the app.
Thanks
"Lloyd Sheen" <a@b.cwrote in message
news:5E******** *************** ***********@mic rosoft.com...
Sorry don't have access to VS but it seems that you are adding the entries
after you bind the list to the combobox. Try it the other way or refresh
the combobox after you add the entries. I don't think that adding will
automatically cause the control to know there are entries. When you bound
the list was empty.
Lloyd Sheen
" active" <ac********** @a-znet.comwrote in message
news:ef******** *****@TK2MSFTNG P05.phx.gbl...
>>I tried to use a datasource with a combobox and it didn't work completely
so I build a small test that was much more straight forward then the app.
The test was to see if the combobox dropdown list displayed the correct
data.
However, although the designer shows the combobox the combobox does not
show at runtime.
If you would be so kind as to cut the code below and paste it into a form
maybe you can easily see why the combobox does not display.
Thanks
Public Class Form1
Inherits System.Windows. Forms.Form
'Form overrides dispose to clean up the component list.
<System.Diagno stics.DebuggerN onUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dis pose()
End If
MyBase.Dispose (disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplica tion1.StringWit hIntegerComboBo x
'Required by the Windows Form Designer
Private components As System.Componen tModel.IContain er
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Private Sub InitializeCompo nent()
Me.ComboBox1 = New WindowsApplicat ion1.StringWith IntegerComboBox
Me.SuspendLayo ut()
'
'ComboBox1
'
Me.ComboBox1.L ocation = New System.Drawing. Point(136, 139)
Me.ComboBox1.N ame = "ComboBox1"
Me.ComboBox1.S ize = New System.Drawing. Size(235, 21)
Me.ComboBox1.T abIndex = 0
'
'Form1
'
Me.AutoScaleDi mensions = New System.Drawing. SizeF(6.0!, 13.0!)
Me.AutoScaleMo de = System.Windows. Forms.AutoScale Mode.Font
Me.ClientSiz e = New System.Drawing. Size(572, 341)
Me.Controls.Ad d(Me.ComboBox1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayou t(False)
End Sub
End Class
Public Class StringWithInteg erComboBox
Inherits System.Windows. Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSourc e = myList
Me.DisplayMemb er = "Str"
Me.ValueMemb er = "Value"
myList.Add(N ew StringWithInteg er("One", 1))
myList.Add(N ew StringWithInteg er("Two", 2))
myList.Add(N ew StringWithInteg er("Three", 3))
End Sub
Public myList As List(Of StringWithInteg er) = New List(Of
StringWithInte ger)
End Class
Public Class StringWithInteg er
Private mInteger As Integer
Private mString As String
Private mToStringDispla ysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteg er
Clone = New StringWithInteg er(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDispla ysInteger Then
ToString = CStr(mInteger)
Else
ToString = mString
End If
End Function
Public Property Str() As String
Get
Str = mString
End Get
Set(ByVal text As String)
mString = text
End Set
End Property
Public Property ToStringDisplay sSingle() As Boolean
Get
ToStringDispla ysSingle = mToStringDispla ysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDispl aysInteger = displayInteger
End Set
End Property
Public Property Value() As Integer
Get
Value = mInteger
End Get
Set(ByVal numb As Integer)
mInteger = numb
End Set
End Property
End Class
You got that right. If I delay Binding until after I've filled the list it
displays OK.
Refreshing the combobox didn't work.
After I've changed data in the list I need a way to "unbind" the list and
"rebind" it.
How do you think I should do that?
Thanks for the help
"Lloyd Sheen" <a@b.cwrote in message
news:5E******** *************** ***********@mic rosoft.com...
Sorry don't have access to VS but it seems that you are adding the entries
after you bind the list to the combobox. Try it the other way or refresh
the combobox after you add the entries. I don't think that adding will
automatically cause the control to know there are entries. When you bound
the list was empty.
Lloyd Sheen
Ok , still don't have access to code but if the refresh doesn't work then
you just need to rebind the datasource. When you bind it will refresh the
contents according to the new content. Just resetting the datasource
property should do it.
Lloyd
" active" <ac********** @a-znet.comwrote in message
news:%2******** ********@TK2MSF TNGP04.phx.gbl. ..
You got that right. If I delay Binding until after I've filled the list it
displays OK.
Refreshing the combobox didn't work.
After I've changed data in the list I need a way to "unbind" the list and
"rebind" it.
How do you think I should do that?
Thanks for the help
"Lloyd Sheen" <a@b.cwrote in message
news:5E******** *************** ***********@mic rosoft.com...
>Sorry don't have access to VS but it seems that you are adding the
entries after you bind the list to the combobox. Try it the other way or
refresh the combobox after you add the entries. I don't think that
adding will automatically cause the control to know there are entries.
When you bound the list was empty.
Lloyd Sheen
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