label wont update text

label wont update text

• Davve

  My app allows a user to create and store any number of PrintLabel templates for printing barcode labels. When a Plabel is viewed for changes etc I retrieve a set of records for the Plabel which correspond to the data which appears on the Plabel(fields), for each field a label control is created with the properties retrieved from the database ie. xpos,ypos, text, fontsize etc. When changes are made I clear all label controls and recreate them. This was the only solution I could find that would persist the text on the label control.

  Private Sub AddItemLabel(ByRef thisPrintItem As PrintItem, ByVal lblname As String, ByVal LabelText As String, ByVal xpos As Integer, ByVal ypos As Integer, _

  ByVal FontSize As Single, ByVal ID As Integer)

  Dim lblNew As New Label

  Dim obinding As Binding = Nothing

  Dim currentSize As Single

  With lblNew

  .Text = LabelText

  .BorderStyle = BorderStyle.None

  .AutoSize = True

  .BackColor = Color.White

  .BackColor = Color.Transparent

  .Name = lblname

  .Parent = GroupBox1

  .Top = ypos

  .Left = xpos

  .Tag = ID 'allows the printItem to be referenced by ID from the labels Tag property

  currentSize = FontSize 'lblNew.Font.Size

  .Font = New Font(thisPrintItem.FieldFont.ToString, currentSize, .Font.Style)

  If thisPrintItem.FontBold = True Then

  .Font = New System.Drawing.Font(thisPrintItem.FieldFont.ToString, currentSize, FontStyle.Bold)

  Else

  .Font = New System.Drawing.Font(thisPrintItem.FieldFont.ToString, currentSize, FontStyle.Regular)

  End If

  'The following Handlers are linked to "My Dynamic Label EventHandlers"

  AddHandler .Click, AddressOf Label_Click

  AddHandler .MouseDown, AddressOf Label_MouseDown

  AddHandler .MouseUp, AddressOf label_mouseup

  AddHandler .MouseMove, AddressOf Label_MouseMove

  AddHandler .MouseLeave, AddressOf Label_MouseLeave

  AddHandler .DoubleClick, AddressOf Label_DoubleClick

  GroupBox1.Controls.Add(lblNew)

  lblNew.ContextMenu = lblMenu

  lblNew.Visible = True

  End With

  End Sub

  The final stage of the routine that calls the above is to repaint

  Me.InvokePaint(Me, New PaintEventArgs(Me.CreateGraphics(), New Rectangle(0, 0, Me.Width, Me.Height)))

  Hope this clears things up a little

  
  

• abc0918

  Hi kiwicoder2,

  thanks for ur post..

  tell me what is the role of invokepaint what does it actually do

  what i have done now is to update a control, i write

  me.controls.removeat(indexnoofthecontrol)

  and then create a new at the same location..

  but i am still looking for an optimized method..

  Rajesh

  
  
  

• AndyL

  Have you tried a PerformLayout
  
  

• Helen Cool Granny

  Cheers for all the replys guys. I have resolved the issue by reloading all the controls with updated values from the database.
  
  Regards
            kev
  
  

• Sébastien Nunes

  Yes refresh is from the dbl click event not the dialog. Got me stumped
  
  
  

• nickisacrazypirate

  Are you performing the refresh on the form with the label on it (e.g. within the doubleclick event after the dialog is closed)   It should not be called from the dialog unless the dialog has a reference back to the main form.
  
  Josh
  
  

• Wolfsvein

  Did you try application.doevents()

  --Carl

  
  

• tranders

  There seems to be an issue with the invalidate method because I couldn't get it to work either. It's supposed to cause repainting, but it doesn't.
  
  Regards,
  
    Guido
  

• Ole Brydensholt

  hi kiwicoder2

  even i am facing the same problem. please tell me how did u resolve by Reloading all the controls.

  How did you reload all the controls

  Regards

  
  
  

• turnbui

  hi Carl

  thanks for your concern.. i am a beginner, so please explain a little more as to where shud i write application.doevents().

  basically, i have a set of linklabels i initialize, and assign values to, in a function. this function takes as an input, a string variable(URL of an XML file) and reads and fills the labels.

  Now On a button click, i want them to load a similar but different XML file having different values. And want to update the same already created Linklabels.

  So what I did was on the button click event, i invoke the same function and pass a different URL. But nothing is updated.

  One more thing i would like to point is that when I re-invoke the XML read function, the linklabels are again redefined...

  I have tried using me.refresh(), me.activate() but none work.

  I have not created label arrays instead wrote this:

  Dim lbl As LinkLabel

  lbl = New System.Windows.Forms.LinkLabel

  And this code is repeated each time for each node in the XML.

  Hope you understood my problem.. waiting to hear from you :)

  
  
  

• Deepak Vyas

  A. Rajesh wrote:

  hi Carl thanks for your concern.. i am a beginner, so please explain a little more as to where shud i write application.doevents().

  Anywhere you update a label

  label1.text="new info"

  application.doevents()

  I don't know if that will work or not for what you are doing, it was just a suggestion to try it.

  Carl

  
  

• Adam Uebel

  Tried that but it won't work. strange eh
  
  

• levi.rogers

  I'm not 100% sure, but i think calling refresh() will only draw portions marked as dirty.
  If it's not getting marked as dirty, you can specify to redraw the entire form.
  
  Use
  
  

  Me.Invalidate()

  
  
  or
  
  

  Me.InvokePaint(Me, New PaintEventArgs(Me.CreateGraphics(), New Rectangle(0, 0, Me.Width, Me.Height)))

  
  
  
  Dustin.
  
  
  

• Neotech

  You need to repaint the screen after closing the dialog box ...
  
  <form_name>.Refresh
  or
  me.Refresh (if refreshing from within the code of the form)
  
  Hope this helps,
  Josh Lindenmuth
  
  
  
  
• label wont update text