Solved

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

Posted on 2014-10-28
2
696 Views
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

Open in new window

0
Comment
Question by:Mike Eghtebas
2 Comments
 
LVL 33

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(...)

Open in new window

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

Open in new window


-saige-
0
 
LVL 33

Author Closing Comment

by:Mike Eghtebas
ID: 40409254
Thank you.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
DateTimepicker 4 33
Replace &lt; with < 14 56
Receiving a string from a WebService Push 21 37
Code works but it's slow 24 44
Creating an analog clock UserControl seems fairly straight forward.  It is, after all, essentially just a circle with several lines in it!  Two common approaches for rendering an analog clock typically involve either manually calculating points with…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, just open a new email message. In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now