Re: Updating controls on a form

No, because I cannot predict what future users of this dll will name their
controls.  Right not I just have 12 variables (private shared) exposed
through read-only properties. I raise the NewData event when I have updated
the variables, and the executable responds by reading the properties.  I
have even tried reading the properties into variables in the Windows exe,
but when I try to update the Windows controls from these variables, I still
get the cross-thread error.

-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps and
controls [mailto:[email protected]] On Behalf Of Vince P
Sent: Saturday, March 24, 2007 11:27 PM
To: [email protected]
Subject: Re: [DOTNET-WINFORMS] Updating controls on a form

In your DLL, can you make a member to store the Control object that is using
it?


    public  class DllClass
    {
        private System.Windows.Forms.Control control;

        public DllClass(Control control)
        {
            this.control = control;
        }

        private  void CallFromOtherThread()
        {
            if(control.InvokeRequired)
            {
                control.BeginInvoke(new
MethodInvoker(this.CallFromOtherThread), null);
            }
            else
            {
                // your code here
            }

        }
    }

-
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triumph.

> -----Original Message-----
> From: Discussion forum for developers using Windows Forms to build apps
> and controls [mailto:[email protected]] On Behalf Of
> Kelly Baker
> Sent: Saturday, March 24, 2007 21:37
> To: [email protected]
> Subject: [DOTNET-WINFORMS] Updating controls on a form
>
> Unless my app is EXTREMELY simple, I get the cross-threading error
> message
> regularly when updating controls on a Windows form.
>
> My latest example involves a dll that runs a System.Threading.Timer,
> updating private shared variables.  When it finishes updating, it
> raises a
> NewData event.  My app responds to that event by updating display
> controls
> (labels in this case).  I have to use a delegate and update them like
> this:
>
> Private Sub SetText(ByVal [text] as String)
>     If Me.Messages.InvokeRequired Then
>         Dim d as New SetTextCallBack(AddressOf SetText)
>         Me.Invoke(d, New Object() {[text]})
>     Else
>         Me.Messages.Text = [text]
>     End If
> End Sub
>
> I have to write a different routine like this for each control on the
> form
> that I want to update.  Is there a better way?  Please?