?
Solved

WPF Update a user control embedded into my window

Posted on 2016-09-19
3
Medium Priority
?
54 Views
Last Modified: 2016-09-19
I am trying to update a user control in my windows and it doesn't work.  MSDN says that you have to use the UI thread to update it but with all the examples all over the place - nothing works...

I have a user control for a status which every window gets:

        public StatusBar()
        {
            InitializeComponent();
            //setInitialStatusBar();
            bw.WorkerReportsProgress = true;
            bw.WorkerSupportsCancellation = false;
            bw.RunWorkerAsync();
        }

        public void setStatusBar(ErrorValues ev)
        {

            tbxStatusBar.Text = ev.strErrorMessage;
            tbxStatusBar.TextWrapping = TextWrapping.Wrap;
            tbxStatusBar.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
            tbxStatusBar.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
}

I am trying to update the status from a window which contains the text box in the XAML and the code behind is the same windows code behind:

        public void UsersOpen()
        {
            this.Show();
           
            var ev = new ErrorValues();

            ev.strMessageType = "BAD";
            ev.strErrorMessage = "HOLY CODE DICK TRACY!!";

            setStatus(ev);
        }

        [STAThread]
        private void setStatus(ErrorValues ev)
        {
            var stat = new StatusBar();
            Dispatcher.Invoke(() => Dispatcher.BeginInvoke((Action)(() => stat.setStatusBar(ev))));
        }


I have tried Invoke, BeginInvoke and dozens of other ways but this is very elusive.  So I am going to have 20 windows with this control that need to push messages to the control so it is displayed on the window.

Any help is greatly appreciated!
0
Comment
Question by:cyimxtck
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 29

Expert Comment

by:Gautham Janardhan
ID: 41805326
looks like you are setting on a new object (var stat = new StatusBar();)

if its in same code behind as user contrl

             Dispatcher.Invoke(() => Dispatcher.BeginInvoke((Action)(() => this.setStatusBar(ev))));

Open in new window



if the code behind is ur window where user control is embedded then replace "this" with the name of the control in xaml
0
 

Author Comment

by:cyimxtck
ID: 41805343
There are two different code behinds/classes.....when I say same page I mean in the XAML:

        <StackPanel Margin="0,0,0,0">
            <local:StatusBar Height="Auto" Margin="10,10,10,411"/>
        </StackPanel>

The above code of course wouldn't work because this.setStatusBar = var stat = new StatusBar(); as you mentioned.

Thanks for the quick reply.  Do you have any other ideas?
0
 
LVL 29

Accepted Solution

by:
Gautham Janardhan earned 2000 total points
ID: 41805347
 <StackPanel Margin="0,0,0,0">
            <local:StatusBar x:Name="stausBar" Height="Auto" Margin="10,10,10,411"/>
        </StackPanel>

Open in new window


and then change code to

             Dispatcher.Invoke(() => stausBar.setStatusBar(ev));

Open in new window

0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
Suggested Courses

801 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