How write to a text box while loop running on button click WPF

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When I click on the button the code runs correctly but the text box does not update in the UI until the entire while loop has finished. I need it to update the text box on every loop.

C#

private void btnBeginTransfer_Click(object sender, RoutedEventArgs e)
       {

           serial.PortName = port;
           serial.BaudRate = baud;
           serial.DataBits = dataBit;
           serial.StopBits = (StopBits)Enum.Parse(typeof(StopBits), stopBit);
           serial.Handshake = (Handshake)Enum.Parse(typeof(Handshake), handshake);
           serial.Parity = (Parity)Enum.Parse(typeof(Parity), parity);
           serial.ReadTimeout = rTimeout;
           serial.WriteTimeout = wTimeout;
           serial.Open();

           //reading file and writing it across
           using (System.IO.TextReader reader = System.IO.File.OpenText(txtSelect.Text))
           {
               string line;

               while ((line = reader.ReadLine()) != null)
               {
                   serial.WriteLine(line);
                   //updating the text box
                   txtTransferredData.Text += line + "\n";

               }
           }

           serial.Close();

       }

Sample code would be very helpful.

Posted 9-Oct-14 4:39am

Bryan Fil

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Comments

Christian Amado 9-Oct-14 10:53am

Using BackgroundWorker.

ZurdoDev 9-Oct-14 10:53am

You'll have to use multiple threads I believe because the default is the UI is on that same thread and so won't update until it is done.

2 solutions

Solution 1

Hi,

You can use background worker so your UI wont be stop till the time your while loop is running. Let me know if it wont work for you.

Refer : Background Worker[^]

Thanks

Posted 9-Oct-14 4:55am

AmitGajjar

Comments

Bryan Fil 9-Oct-14 11:08am

I have tried to write in a background worker and cant seem to get it working right. All the example i see have if loops and throw me off.

ZurdoDev 9-Oct-14 11:23am

Then I suggest you start a new question and post the relevant code and show us what is happening.

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jadavparesh06 · Accepted Answer · 2014-10-09T16:58:00

You will required to have the Refresh applied on your textbox so it will display all the texts while the loop is running.

You will require to have a static class for ExtensionMethods that will contain your refresh routine.

C#

public static class ExtensionMethods
    {
        private static Action EmptyDelegate = delegate() { };

        public static void Refresh(this UIElement uiElement)
        {
            uiElement.Dispatcher.Invoke(DispatcherPriority.Render, EmptyDelegate);
        }
    }

now simply calling

txtTransferredData.Refresh()

will refresh your textbox text within loop as well.
I think this will work in your case.