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Threading is not a member of windows... vb.net

Posted on 2014-10-28
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Last Modified: 2014-10-28
At line 22, I am getting two error notes:  

Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input, DirectCast(Sub() element.Focus(),

Dispatcher: Dispacher is not declared. It may be inaccessible due to its protection level.
System.Windows.Threading: Threading is not a member of windows

Question: How can I fix this?

Please, in addition to description of the direction, give me the syntax for my use.


tabcontrol.IsSelected=true;
PutFocusOnControl(textBox1);
and define the method...

 private void PutFocusOnControl(Control element)
        {
            if (element != null)
                Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input,
                    (System.Threading.ThreadStart)delegate
                    {
                        element.Focus();
                    });
        }

or:

                TabControl1.SelectedTab = tabChannels
                PutFocusOnControl(txtChannels_channel)

    Private Sub PutFocusOnControl(element As Control)
        If element IsNot Nothing Then
            Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input, DirectCast(Sub() element.Focus(), System.Threading.ThreadStart))
        End If
    End Sub

from:
http://stackoverflow.com/questions/3865370/unable-to-set-focus-on-controls-inside-tab-control-in-wpf

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Question by:Mike Eghtebas
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2 Comments
 
LVL 34

Accepted Solution

by:
it_saige earned 500 total points
ID: 40409232
Have you added a reference to WindowBase.dll?

http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher(v=vs.110).aspx

To add the reference:
1.  Right-click on your project and select 'Add Reference'Capture.JPG2.  Select the .NET tab.Capture.JPG3.  Locate and select 'WindowsBase'Capture.JPG4.  Press 'OK'.

Once you have the reference added then you may need to refer to Dispatcher by it's fully qualified name, e.g. -
System.Windows.Threading.Dispatcher.BeginInvoke(...)

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Or you can add an Imports statement to the top of your code file, e.g. -
Imports System.Windows.Threading

Public Class SomeClass
...
...
End Class

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-saige-
0
 
LVL 34

Author Closing Comment

by:Mike Eghtebas
ID: 40409254
Thank you.
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