application doesn't show in taskbar with application.run(FRM). Tried multiple things

Question

Running frameworks 4.0 (VB.net)

The property ShowInTaskbar is set to True.

Here the code to run the main window.

 Dim frm As New frmMain
 frm.ShowInTaskbar = True
 Application.Run(frm)

Here all the code from the frmMain

  Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Try
        Application.DoEvents()
        Me.Focus()
        Me.Activate()

        PeutExecuterSynchronisationAutomatique = True
        'placer le bouton d'aide en ligne 
        btnAideToolTip.Location = New Point((btnPreference.Location.X - btnAideToolTip.Width) - 5, btnAideToolTip.Location.Y)
        btnAideToolTip.Visible = True



        Label5.Text = "version(x)"

    Catch ex As Exception
        HandleException(ex)
    End Try
End Sub

Here all the code from the inherits form

Public Overridable Sub FormBase_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Try


        If Not designmode AndAlso Not Application.ExecutablePath.ToLower().IndexOf("devenv.exe") > -1 Then
            If EasyDealINI.FichierINIEasyDealTailleDefaut = False Then

                Me.Height = CInt(Me.Height * Ratio)
                Me.Width = CInt(Me.Width * Ratio)
                Me.Font = New Font(Me.Font.FontFamily, (Me.Font.Size * Ratio) - (DIMINUEUR_RATIO_POLICE * Ratio), Me.Font.Style)


                Me.CenterToScreen()

                UC_MenuBottom.AjusterControles()
                UC_MenuBottom.AppliquerTypeBouton()
            End If
        End If


        If Not DesignMode Then
            'Sert à ce qu'EasyDeal en plein écran n'ait pas l'air d'un Transformer qui se déplie.
            'Me.Visible = False --> Suspend le layout dans FormBaseDetailCalcul (voir AjusterControls) - Philippe 2008/06/04

            If Not FormBase.DossierImagesPath Is Nothing Then
                Dim strNomFichier As String = FormBase.DossierImagesPath & "Icone.ico"  'Le signe chinois
                'Dim strNomFichier As String = FormBase.DossierImagesPath & "Logo.ico"   'La terre
                Dim Fichier As New FileInfo(strNomFichier)
                If Fichier.Exists Then
                    Me.Icon = New Icon(strNomFichier)
                End If
            End If
        End If

        Me.MaximizeBox = False
        Me.MinimizeBox = True
        DesactiverCloseBouton()

        'Pour permettre que sur le ENTER la navigation se fasse comme en Access
        '(Agir comme un (TAB)... Voir évenement FormBase_KeyUp
        Me.KeyPreview = True
        Me.ShowInTaskbar = True
        Me.StartPosition = FormStartPosition.CenterScreen

        Me.AppliquerCouleurs(Me)

        'on met Easydeal comme texte de fenêtre 
        Me.Text = DEFAULT_WINDOW_TEXT
        Me.Focus()
        Me.Activate()

    Catch ex As Exception
        HandleException(ex)
    End Try
End Sub

but this doesn't help, even if i click on the form the app doesn't appear on the task bar.

However, what is really weird is if i put a breakpoint or if i first click on the taskbar and then click again on the form the program will appear on the taskbar.

An alt-tab make the program appear in the task bar too.

Thanks!

Answer 1

Toggle ShowInTaskbar in my form load event with these two lines:

It works only if the window is not a modal one. Which is kind of good for now.

This.ShowInTaskbar = False;
This.ShowInTaskbar = True;

However, if i set on a modal window showmeintaskbar to false the form close itself

here is the callstack :

>   EasyDeal.exe!EasyDeal.Windows.UI.FrmMenuSuivi.FrmMenuSuivi_FormClosing(Object sender, System.Windows.Forms.FormClosingEventArgs e) Line 382 Basic
System.Windows.Forms.dll!System.Windows.Forms.Form.OnFormClosing(System.Windows.Forms.FormClosingEventArgs e) + 0x85 bytes  
System.Windows.Forms.dll!System.Windows.Forms.Form.CheckCloseDialog(bool closingOnly) + 0x8d bytes  
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FContinueMessageLoop(int reason, int pvLoopData, System.Windows.Forms.NativeMethods.MSG[] msgPeeked) + 0x148 bytes   
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(System.IntPtr dwComponentID, int reason, int pvLoopData) + 0x1e9 bytes    
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason, System.Windows.Forms.ApplicationContext context) + 0x16c bytes  
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) + 0x61 bytes    
System.Windows.Forms.dll!System.Windows.Forms.Application.RunDialog(System.Windows.Forms.Form form) + 0x33 bytes    
System.Windows.Forms.dll!System.Windows.Forms.Form.ShowDialog(System.Windows.Forms.IWin32Window owner) + 0x38f bytes    
System.Windows.Forms.dll!System.Windows.Forms.Form.ShowDialog() + 0x7 bytes 
EasyDeal.exe!EasyDeal.Windows.UI.EasyDealCommon.ShowEasyDealForm(EasyDeal.Windows.UI.FormBase formToShow, EasyDeal.Windows.UI.FormBase formSender, Boolean closeFormSender, Boolean forceDialog) Line 2787 + 0xc bytes  Basic

Answer 2

Sorry I only have C# Examples but the same logic applies!

I have seen this issue in some cases where form Re-Sizing or Positioning is done in the Form_Load Method. Any manoeuvre like this:

// Set Size and location of items...
this.MaximumSize = new System.Drawing.Size(1012, 665);
this.MinimumSize = new System.Drawing.Size(1012, 665);
this.MaximizeBox = false;

or anything like this:

// Centre the main form to centre screen...
this.Location = new Point((Screen.PrimaryScreen.Bounds.Size.Width / 2) - (this.Size.Width / 2), (Screen.PrimaryScreen.Bounds.Size.Height / 2) - (this.Size.Height / 2));

If you need to do any of this, make sure is done in the right place. I prefer mine in the:

Form1()

method just after the:

// Initialize Components...
InitializeComponent();

Method. This will ensure your Forms Icon will appear and solve your problem.

Answer 3

What is the window's FormBorderStyle? If it's FixedToolWindow, it wont show in the taskbar