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.Diagnostics.DebuggerNonUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
Friend WithEvents ComboBox1 As WindowsApplication1.StringWithIntegerComboBox
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'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 InitializeComponent()
Me.ComboBox1 = New WindowsApplication1.StringWithIntegerComboBox
Me.SuspendLayout()
'
'ComboBox1
'
Me.ComboBox1.Location = New System.Drawing.Point(136, 139)
Me.ComboBox1.Name = "ComboBox1"
Me.ComboBox1.Size = New System.Drawing.Size(235, 21)
Me.ComboBox1.TabIndex = 0
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.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 StringWithIntegerComboBox
Inherits System.Windows.Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMember = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteger("One", 1))
myList.Add(New StringWithInteger("Two", 2))
myList.Add(New StringWithInteger("Three", 3))
End Sub
Public myList As List(Of StringWithInteger) = New List(Of StringWithInteger)
End Class
Public Class StringWithInteger
Private mInteger As Integer
Private mString As String
Private mToStringDisplaysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteger
Clone = New StringWithInteger(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDisplaysInteger 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 ToStringDisplaysSingle() As Boolean
Get
ToStringDisplaysSingle = mToStringDisplaysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDisplaysInteger = 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  1485 
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*************@TK2MSFTNGP05.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.Diagnostics.DebuggerNonUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplication1.StringWithIntegerComboBox
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'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 InitializeComponent()
Me.ComboBox1 = New WindowsApplication1.StringWithIntegerComboBox
Me.SuspendLayout()
'
'ComboBox1
'
Me.ComboBox1.Location = New System.Drawing.Point(136, 139)
Me.ComboBox1.Name = "ComboBox1"
Me.ComboBox1.Size = New System.Drawing.Size(235, 21)
Me.ComboBox1.TabIndex = 0
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.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 StringWithIntegerComboBox
Inherits System.Windows.Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMember = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteger("One", 1))
myList.Add(New StringWithInteger("Two", 2))
myList.Add(New StringWithInteger("Three", 3))
End Sub
Public myList As List(Of StringWithInteger) = New List(Of
StringWithInteger)
End Class
Public Class StringWithInteger
Private mInteger As Integer
Private mString As String
Private mToStringDisplaysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteger
Clone = New StringWithInteger(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDisplaysInteger 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 ToStringDisplaysSingle() As Boolean
Get
ToStringDisplaysSingle = mToStringDisplaysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDisplaysInteger = 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*************@TK2MSFTNGP05.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.Diagnostics.DebuggerNonUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplication1.StringWithIntegerComboBox
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'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 InitializeComponent()
Me.ComboBox1 = New WindowsApplication1.StringWithIntegerComboBox
Me.SuspendLayout()
'
'ComboBox1
'
Me.ComboBox1.Location = New System.Drawing.Point(136, 139)
Me.ComboBox1.Name = "ComboBox1"
Me.ComboBox1.Size = New System.Drawing.Size(235, 21)
Me.ComboBox1.TabIndex = 0
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.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 StringWithIntegerComboBox
Inherits System.Windows.Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMember = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteger("One", 1))
myList.Add(New StringWithInteger("Two", 2))
myList.Add(New StringWithInteger("Three", 3))
End Sub
Public myList As List(Of StringWithInteger) = New List(Of
StringWithInteger)
End Class
Public Class StringWithInteger
Private mInteger As Integer
Private mString As String
Private mToStringDisplaysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteger
Clone = New StringWithInteger(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDisplaysInteger 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 ToStringDisplaysSingle() As Boolean
Get
ToStringDisplaysSingle = mToStringDisplaysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDisplaysInteger = 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**********************************@microsof t.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*************@TK2MSFTNGP05.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.Diagnostics.DebuggerNonUserCode()_
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
Friend WithEvents ComboBox1 As
WindowsApplication1.StringWithIntegerComboBox
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'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 InitializeComponent()
Me.ComboBox1 = New WindowsApplication1.StringWithIntegerComboBox
Me.SuspendLayout()
'
'ComboBox1
'
Me.ComboBox1.Location = New System.Drawing.Point(136, 139)
Me.ComboBox1.Name = "ComboBox1"
Me.ComboBox1.Size = New System.Drawing.Size(235, 21)
Me.ComboBox1.TabIndex = 0
'
'Form1
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.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 StringWithIntegerComboBox
Inherits System.Windows.Forms.ComboBox
Public Sub New()
MyBase.New()
Me.DataSource = myList
Me.DisplayMember = "Str"
Me.ValueMember = "Value"
myList.Add(New StringWithInteger("One", 1))
myList.Add(New StringWithInteger("Two", 2))
myList.Add(New StringWithInteger("Three", 3))
End Sub
Public myList As List(Of StringWithInteger) = New List(Of
StringWithInteger)
End Class
Public Class StringWithInteger
Private mInteger As Integer
Private mString As String
Private mToStringDisplaysInteger As Boolean = False
Public Sub New(ByVal str As String, ByVal value As Integer)
mString = str
mInteger = value
End Sub
Public Function Clone() As StringWithInteger
Clone = New StringWithInteger(mString, mInteger)
End Function
Public Overrides Function ToString() As String
If mToStringDisplaysInteger 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 ToStringDisplaysSingle() As Boolean
Get
ToStringDisplaysSingle = mToStringDisplaysInteger
End Get
Set(ByVal displayInteger As Boolean)
mToStringDisplaysInteger = 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**********************************@microsof t.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****************@TK2MSFTNGP04.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**********************************@microsof t.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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