WPF中的CheckForIllegalCrossThreadCalls

Question

I am writing my Bot for Twitch and i am using library called TwichLib ( https://github.com/swiftyspiffy/TwitchLib ) now in example which is made for WinForms there is method called globalChatMessageReceived and there is CheckForIllegalCrossThreadCalls = false; . So whole method looks like

        private void globalChatMessageReceived(object sender, TwitchChatClient.OnMessageReceivedArgs e)
        {
            //Don't do this in production
            CheckForIllegalCrossThreadCalls = false;

            richTextBox1.Text = String.Format("#{0} {1}[isSub: {2}]: {3}", e.ChatMessage.Channel, e.ChatMessage.DisplayName, e.ChatMessage.Subscriber, e.ChatMessage.Message) + 
                "\n" + richTextBox1.Text;
        }

Now in WPF you are already unable to do this CheckForIllegalCrossThreadCalls so can someone point me on how should i properly do this method to solve this CrossThreadCalls?

Answer 1

The correct way to do this is to use the WPF dispatcher to perform the action on the UI thread:

private void globalChatMessageReceived(object sender, TwitchChatClient.OnMessageReceivedArgs e)
{
    var dispatcher = Application.Current.MainWindow.Dispatcher;
    // Or use this.Dispatcher if this method is in a window class.

    dispatcher.BeginInvoke(new Action(() =>
    {
        richTextBox1.Text = String.Format("#{0} {1}[isSub: {2}]: {3}", e.ChatMessage.Channel, e.ChatMessage.DisplayName, e.ChatMessage.Subscriber, e.ChatMessage.Message) + 
            "\n" + richTextBox1.Text;
    });
}

Or, better, use data binding (if you can) so you don't need to worry about it.