CODEWITHSUNDEEP
c#wpf
Z3nto
Z3nto

Reputation: 11

c# WPF Gui update with Dispatcher from another thread

I'm trying to update my WPF GUI from another thread. I've found some solutions with using the Dispatcher but it's still not working.

For example I'm using it in a catch block:

catch (Exception err){
    Dispatcher.BeginInvoke((Action)(() => {
        pConsole.AppendText(err.Message);
        pConsole.ScrollToEnd();
    }));
    return;
}

pConsole is a RickTextBox.

With the dispatcher there is an output at the pConsole, but the output is:

The calling thread cannot access this object because a different thread owns it.

Any idea what's wrong?

Upvotes: 0

Views: 188

Answers (2)

Tanveer Badar
Tanveer Badar

Reputation: 5523

For a change, try appending the stack trace and the message to your RTF box.

catch (Exception err){
    Dispatcher.BeginInvoke((Action)(() => {
        pConsole.AppendText(err.Message);
        pConsole.AppendText(err.StackTrace);
        pConsole.ScrollToEnd();
    }));
    return;
}

There is nothing wrong with the code you wrote, it is just displaying the error message which was generated in the try block itself.

Upvotes: 0

M. Flansmose
M. Flansmose

Reputation: 86

It doesn't look like there is a problem with the code you have posted, but since you write that the RichTextBox actually receives the text

The calling thread cannot access this object because a different thread owns it.

it seems like your exception handling code is working as it should, but catching an exception coming from the code in your try block.

In other words, check that the cause of the InvalidOperationException isn't in the try block.

Upvotes: 1

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