Well, I have some code for you to try. Its not a combo box, but it is an autocomplete text box with modifications that perform as you are requesting.
Copy the code into a new form. Then before doing anything else, save and build. Then go to the form designer and drag a new ClsCustomAutoCompleteTextbox onto your form.
Then you should be able to run it. I do realize that you are wanting C# (At least now I realize that). Try this in VB and see if this is what you want, and I can convert it to C#.
Public Class Form1
Dim MasterList As New List(Of String)
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim L As New List(Of String)
L.Add("123123 - Bob")
L.Add("534543 - Sally")
L.Add("123123 - George")
L.Add("34213 - Happy")
MasterList = L
Me.ClsCustomAutoCompleteTextbox1.AutoCompleteList = L
End Sub
Private Sub ClsCustomAutoCompleteTextbox1_BeforeDisplayingAutoComplete(ByVal sender As Object, ByVal e As clsCustomAutoCompleteTextbox.clsAutoCompleteEventArgs) Handles ClsCustomAutoCompleteTextbox1.BeforeDisplayingAutoComplete
Dim Name As String = Me.ClsCustomAutoCompleteTextbox1.Text.ToLower
Dim Display As New List(Of String)
For Each Str As String In MasterList
If Str.ToLower.IndexOf(Name) > -1 Then
Display.Add(Str)
End If
Next
e.AutoCompleteList = Display
e.SelectedIndex = 0
End Sub
End Class
#Region "clsCustomAutoCompleteTextbox"
Public Class clsCustomAutoCompleteTextbox
Inherits TextBox
Event BeforeDisplayingAutoComplete(ByVal sender As Object, ByVal e As clsAutoCompleteEventArgs)
Event ItemSelected(ByVal sender As Object, ByVal e As clsItemSelectedEventArgs)
Public test As New List(Of String)
Public Tabs As Integer = 0
Private Function GetLastFunction(Optional ByVal Deep As Integer = 1) As System.Reflection.MethodInfo
Dim ST As New StackTrace
Dim Frame As StackFrame = ST.GetFrame(Deep)
Return Frame.GetMethod()
End Function
Private Sub TempLogStart()
'Dim Meth As System.Reflection.MethodInfo = GetLastFunction(3)
'test.Add(Now & " - " & New String(" ", Tabs * 2) & "Started " & Meth.Module.Name & "." & Meth.Name)
'Tabs += 1
End Sub
Private Sub TempLogStop()
' Dim Meth As System.Reflection.MethodInfo = GetLastFunction(3)
' Tabs -= 1
' test.Add(Now & " - " & New String(" ", Tabs * 2) & "Stopped " & Meth.Module.Name & "." & Meth.Name)
End Sub
Public Enum SelectOptions
OnEnterPress = 1
OnSingleClick = 2
OnDoubleClick = 4
OnTabPress = 8
OnRightArrow = 16
OnEnterSingleClick = 3
OnEnterSingleDoubleClicks = 7
OnEnterDoubleClick = 5
OnEnterTab = 9
'OnItemChange = 32
End Enum
Private mSelStart As Integer
Private mSelLength As Integer
Private myAutoCompleteList As New List(Of String)
Private WithEvents myLbox As New ListBox
Private WithEvents myForm As New Form
Private WithEvents myParentForm As Form
Private DontHide As Boolean = False
Private SuspendFocus As Boolean = False
Dim Args As clsAutoCompleteEventArgs
WithEvents HideTimer As New Timer()
WithEvents FocusTimer As New Timer()
Private myShowAutoCompleteOnFocus As Boolean
Private myAutoCompleteFormBorder As System.Windows.Forms.FormBorderStyle = FormBorderStyle.None
Private myOnEnterSelect As Boolean
Private mySelectionMethods As SelectOptions = (SelectOptions.OnDoubleClick Or SelectOptions.OnEnterPress)
Private mySelectTextAfterItemSelect As Boolean = True
Public Property SelectTextAfterItemSelect() As Boolean
Get
Return mySelectTextAfterItemSelect
End Get
Set(ByVal value As Boolean)
mySelectTextAfterItemSelect = value
End Set
End Property
_
Public Property SelectionMethods() As SelectOptions
Get
Return mySelectionMethods
End Get
Set(ByVal value As SelectOptions)
mySelectionMethods = value
End Set
End Property
Public Property OnEnterSelect() As Boolean
Get
Return myOnEnterSelect
End Get
Set(ByVal value As Boolean)
myOnEnterSelect = value
End Set
End Property
Public Property AutoCompleteFormBorder() As System.Windows.Forms.FormBorderStyle
Get
Return myAutoCompleteFormBorder
End Get
Set(ByVal value As System.Windows.Forms.FormBorderStyle)
myAutoCompleteFormBorder = value
End Set
End Property
Public Property ShowAutoCompleteOnFocus() As Boolean
Get
Return myShowAutoCompleteOnFocus
End Get
Set(ByVal value As Boolean)
myShowAutoCompleteOnFocus = value
End Set
End Property
Public ReadOnly Property Lbox() As ListBox
Get
Return myLbox
End Get
End Property
Public Property AutoCompleteList() As List(Of String)
Get
Return myAutoCompleteList
End Get
Set(ByVal value As List(Of String))
myAutoCompleteList = value
End Set
End Property
Private Sub TryHideFormWindowsDeactivated()
End Sub
Private Declare Auto Function GetForegroundWindow Lib "user32.dll" () As IntPtr
Private Declare Auto Function GetWindowThreadProcessId Lib "user32.dll" (ByVal hWnd As IntPtr, ByRef ProcessID As Integer) As Integer
Private Function IsCurProcess(ByVal P As Process) As Boolean
Dim Ptr As IntPtr = P.MainWindowHandle
End Function
Private Function AppHasFocus(Optional ByVal ExeNameWithoutExtension As String = "") As Boolean
Dim Out As Boolean = False
Dim PID As Integer = 0
TempLogStart()
If ExeNameWithoutExtension = "" Then
ExeNameWithoutExtension = Process.GetCurrentProcess.ProcessName
End If
Dim activeHandle As IntPtr = GetForegroundWindow()
Call GetWindowThreadProcessId(activeHandle, PID)
If PID > 0 Then
'For Each p As Process In Process.GetProcessesByName(ExeNameWithoutExtension)
If PID = Process.GetCurrentProcess.Id Then
Out = True
'Exit For
End If
' Next
End If
TempLogStop()
Return Out
End Function
Private Sub SaveSelects()
Me.mSelStart = Me.SelectionStart
Me.mSelLength = Me.SelectionLength
End Sub
Private Sub LoadSelects()
Me.SelectionStart = Me.mSelStart
Me.SelectionLength = Me.mSelLength
End Sub
Private Sub ShowAutoComplete()
TempLogStart()
Args = New clsAutoCompleteEventArgs()
With Args
.Cancel = False
.AutoCompleteList = Me.myAutoCompleteList
If myLbox.SelectedIndex = -1 Then
.SelectedIndex = 0
Else
.SelectedIndex = myLbox.SelectedIndex
End If
End With
RaiseEvent BeforeDisplayingAutoComplete(Me, Args)
Me.myAutoCompleteList = Args.AutoCompleteList
'If Me.myAutoCompleteList IsNot Nothing AndAlso Me.myAutoCompleteList.Count - 1 < Args.SelectedIndex Then
' Args.SelectedIndex = Me.myAutoCompleteList.Count - 1
'End If
If Not Args.Cancel AndAlso Args.AutoCompleteList IsNot Nothing AndAlso Args.AutoCompleteList.Count > 0 Then
Call DoShowAuto()
Else
Call DoHideAuto()
End If
TempLogStop()
End Sub
Private Sub DoShowAuto()
Call SaveSelects()
TempLogStart()
Static First As Boolean = True
myLbox.BeginUpdate()
Try
myLbox.Items.Clear()
myLbox.Items.AddRange(Me.myAutoCompleteList.ToArray)
Call Me.MoveLBox(Args.SelectedIndex)
Catch ex As Exception
End Try
myLbox.EndUpdate()
myParentForm = GetParentForm(Me)
If myParentForm IsNot Nothing Then
myLbox.Name = "mmmlbox" & Now.Millisecond
If myForm.Visible = False Then
myForm.Font = Me.Font
myLbox.Font = Me.Font
myLbox.Visible = True
myForm.Visible = False
myForm.ControlBox = False
myForm.Text = ""
If First Then
myForm.Width = Me.Width
myForm.Height = 200
End If
First = False
If Not myForm.Controls.Contains(myLbox) Then myForm.Controls.Add(myLbox)
myForm.FormBorderStyle = FormBorderStyle.None
myForm.ShowInTaskbar = False
With myLbox
.Dock = DockStyle.Fill
.SelectionMode = SelectionMode.One
End With
'Frm.Controls.Add(myLbox)
DontHide = True
SuspendFocus = True
myForm.TopMost = True
myForm.FormBorderStyle = Me.myAutoCompleteFormBorder
myForm.BringToFront()
Call MoveDrop()
myForm.Visible = True
myForm.Show()
Call MoveDrop()
HideTimer.Interval = 10
Me.Focus()
SuspendFocus = False
HideTimer.Enabled = True
DontHide = False
Call LoadSelects()
End If
End If
TempLogStop()
End Sub
Sub MoveDrop()
TempLogStart()
Dim Pnt As Point = New Point(Me.Left, Me.Top + Me.Height + 2)
Dim ScreenPnt As Point = Me.PointToScreen(New Point(-2, Me.Height))
'Dim FrmPnt As Point = Frm.PointToClient(ScreenPnt)
If myForm IsNot Nothing Then
myForm.Location = ScreenPnt
'myForm.BringToFront()
'myForm.Focus()
'myLbox.Focus()
'Me.Focus()
End If
TempLogStop()
End Sub
Sub DoHide(ByVal sender As Object, ByVal e As EventArgs)
TempLogStart()
Call HideAuto()
TempLogStop()
End Sub
Private Sub DFocus(Optional ByVal Delay As Integer = 10)
TempLogStart()
FocusTimer.Interval = Delay
FocusTimer.Start()
TempLogStop()
End Sub
Private Sub DoHideAuto()
TempLogStart()
myForm.Hide()
HideTimer.Enabled = False
FocusTimer.Enabled = False
TempLogStop()
End Sub
Private Sub HideAuto()
TempLogStart()
If myForm.Visible AndAlso HasLostFocus() Then
Call DoHideAuto()
End If
TempLogStop()
End Sub
Private Function HasLostFocus() As Boolean
TempLogStart()
Dim Out As Boolean
If Me.myForm Is Nothing OrElse myForm.ActiveControl IsNot Me.myLbox Then
Out = True
End If
If Me.myParentForm Is Nothing OrElse Me.myParentForm.ActiveControl IsNot Me Then
Out = True
End If
TempLogStop()
Return Out
End Function
Private Function GetParentForm(ByVal InCon As Control) As Form
TempLogStart()
Dim TopCon As Control = FindTopParent(InCon)
Dim Out As Form = Nothing
If TypeOf TopCon Is Form Then
Out = CType(TopCon, Form)
End If
TempLogStop()
Return Out
End Function
Private Function FindTopParent(ByVal InCon As Control) As Control
TempLogStart()
Dim Out As Control
If InCon.Parent Is Nothing Then
Out = InCon
Else
Out = FindTopParent(InCon.Parent)
End If
TempLogStop()
Return Out
End Function
Public Class clsAutoCompleteEventArgs
Inherits EventArgs
Private myAutoCompleteList As List(Of String)
Private myCancel As Boolean
Private mySelectedIndex As Integer
Public Property SelectedIndex() As Integer
Get
Return mySelectedIndex
End Get
Set(ByVal value As Integer)
mySelectedIndex = value
End Set
End Property
Public Property Cancel() As Boolean
Get
Return myCancel
End Get
Set(ByVal value As Boolean)
myCancel = value
End Set
End Property
Public Property AutoCompleteList() As List(Of String)
Get
Return myAutoCompleteList
End Get
Set(ByVal value As List(Of String))
myAutoCompleteList = value
End Set
End Property
End Class
Protected Overrides Sub OnKeyUp(ByVal e As System.Windows.Forms.KeyEventArgs)
TempLogStart()
TempLogStop()
MyBase.OnKeyUp(e)
Call ShowOnChar(Chr(e.KeyValue))
End Sub
Private Sub ShowOnChar(ByVal C As String)
TempLogStart()
TempLogStop()
If IsPrintChar(C) Then
Call Me.ShowAutoComplete()
End If
End Sub
Private Function IsPrintChar(ByVal C As Integer) As Boolean
TempLogStart()
TempLogStop()
Return IsPrintChar(Chr(C))
End Function
Private Function IsPrintChar(ByVal C As Byte) As Boolean
TempLogStart()
TempLogStop()
Return IsPrintChar(Chr(C))
End Function
Private Function IsPrintChar(ByVal C As Char) As Boolean
TempLogStart()
TempLogStop()
Return IsPrintChar(C.ToString)
End Function
Private Function IsPrintChar(ByVal C As String) As Boolean
TempLogStart()
If System.Text.RegularExpressions.Regex.IsMatch(C, "[^\t\n\r\f\v]") Then
Return True
Else
Return False
End If
TempLogStop()
End Function
Private Sub clsCustomAutoCompleteTextbox_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.GotFocus
TempLogStart()
If Not Me.SuspendFocus AndAlso Me.myShowAutoCompleteOnFocus AndAlso Me.myForm.Visible = False Then
Call Me.ShowAutoComplete()
End If
TempLogStop()
End Sub
Private Sub clsCustomAutoCompleteTextbox_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
TempLogStart()
If Not SelectItem(e.KeyCode) Then
If e.KeyCode = Keys.Up Then
If myLbox.SelectedIndex > 0 Then
Call MoveLBox(myLbox.SelectedIndex - 1)
End If
ElseIf e.KeyCode = Keys.Down Then
Call MoveLBox(myLbox.SelectedIndex + 1)
End If
End If
TempLogStop()
End Sub
Shadows Sub SelectAll()
End Sub
Private Sub MoveLBox(ByVal Index As Integer)
TempLogStart()
Try
If Index > myLbox.Items.Count - 1 Then
Index = myLbox.Items.Count - 1
End If
myLbox.SelectedIndex = Index
Catch ex As Exception
End Try
TempLogStop()
End Sub
Private Sub clsCustomAutoCompleteTextbox_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Leave
TempLogStart()
Call DoHide(sender, e)
TempLogStop()
End Sub
Private Sub clsCustomAutoCompleteTextbox_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.LostFocus
TempLogStart()
Call DoHide(sender, e)
TempLogStop()
End Sub
Private Sub clsCustomAutoCompleteTextbox_Move(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Move
TempLogStart()
Call MoveDrop()
TempLogStop()
End Sub
Private Sub clsCustomAutoCompleteTextbox_ParentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.ParentChanged
TempLogStart()
myParentForm = GetParentForm(Me)
TempLogStop()
End Sub
Private Sub HideTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles HideTimer.Tick
TempLogStart()
Call MoveDrop()
Call DoHide(sender, e)
Static Cnt As Integer = 0
Cnt += 1
If Cnt > 300 Then
If Not AppHasFocus() Then
Call DoHideAuto()
End If
Cnt = 0
End If
TempLogStop()
End Sub
Public Overrides Property SelectedText() As String
Get
Return MyBase.SelectedText
End Get
Set(ByVal value As String)
MyBase.SelectedText = value
End Set
End Property
Public Overrides Property SelectionLength() As Integer
Get
Return MyBase.SelectionLength
End Get
Set(ByVal value As Integer)
MyBase.SelectionLength = value
End Set
End Property
Private Sub myLbox_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles myLbox.Click
End Sub
Private Sub myLbox_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles myLbox.DoubleClick
End Sub
Private Function SelectItem(Optional ByVal Key As Keys = Keys.None, _
Optional ByVal SingleClick As Boolean = False, _
Optional ByVal DoubleClick As Boolean = False) As Boolean
TempLogStart()
Dim DoSelect As Boolean = True
Dim Meth As SelectOptions
Static LastItem As Integer = -1
Select Case True
Case Me.mySelectionMethods And SelectOptions.OnEnterPress AndAlso Key = Keys.Enter
Meth = SelectOptions.OnEnterPress
Case Me.mySelectionMethods And SelectOptions.OnRightArrow AndAlso Key = Keys.Right
Meth = SelectOptions.OnRightArrow
Case Me.mySelectionMethods And SelectOptions.OnTabPress AndAlso Key = Keys.Tab
Meth = SelectOptions.OnTabPress
Case Me.mySelectionMethods And SelectOptions.OnSingleClick AndAlso SingleClick
Meth = SelectOptions.OnSingleClick
Case Me.mySelectionMethods And SelectOptions.OnDoubleClick AndAlso DoubleClick
Meth = SelectOptions.OnDoubleClick
'Case Me.mySelectionMethods And SelectOptions.OnItemChange AndAlso (LastItem <> myLbox.SelectedIndex)
Case Else
DoSelect = False
End Select
LastItem = myLbox.SelectedIndex
If DoSelect Then
Call DoSelectItem(Meth)
End If
TempLogStop()
Return DoSelect
End Function
Private Sub DoSelectItem(ByVal Method As SelectOptions)
TempLogStart()
If Me.myLbox.Items.Count > 0 AndAlso Me.myLbox.SelectedIndex > -1 Then
Dim Value As String = Me.myLbox.SelectedItem.ToString
Dim Orig As String = Me.Text
Me.Text = Value
If mySelectTextAfterItemSelect Then
Try
Me.SelectionStart = Orig.Length
Me.SelectionLength = Value.Length - Orig.Length
Catch ex As Exception
End Try
Else
'Me.SelectionStart = Me.Text.Length
'Me.SelectionLength = 0
End If
RaiseEvent ItemSelected(Me, New clsItemSelectedEventArgs(Me.myLbox.SelectedIndex, Method, Value))
Call Me.DoHideAuto()
End If
TempLogStop()
End Sub
Public Class clsItemSelectedEventArgs
Private myIndex As Integer
Private myMethod As SelectOptions
Private myItemText As String
Public Property ItemText() As Boolean
Get
Return myItemText
End Get
Set(ByVal value As Boolean)
myItemText = value
End Set
End Property
Public Property Method() As SelectOptions
Get
Return myMethod
End Get
Set(ByVal value As SelectOptions)
myMethod = value
End Set
End Property
Public Property Index() As Integer
Get
Return myIndex
End Get
Set(ByVal value As Integer)
myIndex = value
End Set
End Property
Sub New()
End Sub
Sub New(ByVal Index As Integer, ByVal Method As SelectOptions, ByVal ItemText As String)
myIndex = Index
myMethod = Method
myItemText = ItemText
End Sub
End Class
Private Sub myLbox_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles myLbox.GotFocus
TempLogStart()
Call DFocus()
TempLogStop()
End Sub
Private Sub myLbox_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles myLbox.KeyDown
TempLogStart()
Call SelectItem(e.KeyCode)
TempLogStop()
End Sub
Private Sub ProcessKeyEvents(ByVal e As KeyEventArgs)
TempLogStart()
Select Case e.KeyCode
Case Is >= Keys.A And e.KeyCode <= Keys.Z
MyBase.OnKeyUp(e)
Case Keys.Back
Case Keys.Enter
Case Keys.Left, Keys.Right, Keys.Up, Keys.Down
Case Is >= Keys.NumPad0 And e.KeyCode <= Keys.NumPad9, Is >= Keys.D0 And e.KeyCode <= Keys.D9
End Select
TempLogStop()
End Sub
Private Sub myLbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles myLbox.KeyPress
If IsPrintChar(e.KeyChar) Then
'Me.OnKeyPress(e)
'Call MoveDrop()
End If
TempLogStop()
End Sub
Private Sub myLbox_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles myLbox.KeyUp
If IsPrintChar(e.KeyValue) Then
'Me.OnKeyUp(e)
'Call MoveDrop()
End If
TempLogStop()
End Sub
Private Sub myLbox_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles myLbox.LostFocus
TempLogStart()
Call DoHide(sender, e)
TempLogStop()
End Sub
Private Sub myLbox_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles myLbox.MouseClick
TempLogStart()
'If e.Button <> Windows.Forms.MouseButtons.None Then
Call SelectItem(SingleClick:=True)
'End If
TempLogStop()
End Sub
Private Sub myLbox_MouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles myLbox.MouseDoubleClick
TempLogStart()
'If e.Button <> Windows.Forms.MouseButtons.None Then
Call SelectItem(DoubleClick:=True)
'End If
TempLogStop()
End Sub
Private Sub myForm_Deactivate(ByVal sender As Object, ByVal e As System.EventArgs) Handles myForm.Deactivate
TempLogStart()
Call TryHideFormWindowsDeactivated()
TempLogStop()
End Sub
Private Sub myParentForm_Deactivate(ByVal sender As Object, ByVal e As System.EventArgs) Handles myParentForm.Deactivate
TempLogStart()
Call TryHideFormWindowsDeactivated()
TempLogStop()
End Sub
Private Sub FocusTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles FocusTimer.Tick
TempLogStart()
Me.Focus()
TempLogStop()
End Sub
Public Sub New()
End Sub
Private Sub myLbox_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles myLbox.MouseDown
myLbox_MouseClick(sender, e)
End Sub
End Class
#End Region
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