Comments on: WPF equivalent of InvokeRequired

By: Derek

Derek — Tue, 07 Jun 2011 10:57:39 +0000

Thanks for the article! Provided some much needed help to get me unstuck

By: Mauricio Reyes

Mauricio Reyes — Tue, 15 Feb 2011 14:24:09 +0000

You were great help to solve my problem. I use a thread that is listening an UDP Port and changes a TextBlock. I was translating from Windows Forms to WPF using VB.net in a TextBlock

If this helps someone else I paste the code:

Public Sub ListenerUDP(ByVal [text] As String) If (TBVentana.Dispatcher.CheckAccess()) Then TBVentana.Text += [text] Else Dim deleg As New TextChanger(AddressOf ListenerUDP) TBVentana.Dispatcher.Invoke(deleg, System.Windows.Threading.DispatcherPriority.Normal, {[text]}) End If End Sub

Private Delegate Sub TextChanger(ByVal [text] As String)

Public Sub ListenerUDP(ByVal [text] As String) If Me.RTBVentana.InvokeRequired Then Dim d As New SetTextCallback(AddressOf ListenerUDP) Me.Invoke(d, New Object() {[text]}) Else Me.RTBVentana.AppendText([text]) End If End Sub

Delegate Sub SetTextCallback(ByVal [text] As String)

By: Navraj Singh

Navraj Singh — Sun, 12 Dec 2010 08:12:57 +0000

Hello,
i was banging my head all day trying to update the WPF ui from another thread with no success. and people have posted so many complex examples mentioning threads and background workers and what not. all i needed was a couple of lines of code and thats wht you gave me. thank you very much.i appreciate your efforts.

Navraj Singh

By: Dee

Dee — Mon, 28 Dec 2009 10:21:15 +0000

Thanks for the article.Works great.

By: Đonny

Đonny — Thu, 19 Nov 2009 20:49:04 +0000

Thank you, this helped me a lot.

By: Jayson Ingels

Jayson Ingels — Thu, 12 Nov 2009 15:24:27 +0000

I think it’s worth mentioning that

Dispatcher.CheckAccess()

is hidden from intellisense for some reason. Maybe a bug?

Note: The above statement was tested on Visual Studio 2008 Express SP1

By: GeeQ

GeeQ — Sun, 23 Nov 2008 21:42:05 +0000

Hello There,

i have a little problem:

when i trying to use your code it says that i need to add an “addressof” cuz its the only modifier of something – can’t remember exactly. The problem is with this code:

Thanks;

private void ChangeTextProperly()
{
if (this.txtMain.Dispatcher.CheckAccess())
{
this.txtMain.Text = “Hello World”;
}
else
{
this.txtMain.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
new TextChanger(this.ChangeTextProperly));
}
}