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POProgressBar not updating
 

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    <p>I have a WPF form containing a button and a progress bar element. When I click the button it calls a function from another class that begins a background worker which is responsible for reading/writing data through a serial port to a device I am programming a windows interface for.</p> <p>Previously I was using a new thread, but I decided to try a background worker, but still no luck.</p> <p>What is happening is I click the button and the progress bar stays at 0% until my time consuming (10+ seconds) for loop is finished, and then the progress jumps to 100%</p> <p>Any help is appreciated, thanks in advance. Below is the code for my interface logic:</p> <pre><code>private void connectButton_Click(object sender, RoutedEventArgs e) //Connect button clicked { if (!Global.isConnected) { device.readValues((string)portsOpen.SelectedValue, connectProgress); portsOpen.IsEnabled = false; connectButton.Content = "Disconnect"; } else { device.disconnect(); portsOpen.IsEnabled = true; connectButton.Content = "Connect"; } } </code></pre> <p>And below is the code for my additional class:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO.Ports; using System.Windows.Controls; using System.ComponentModel; namespace lookoutSecurity { class agentRadioRead { /*Local Variable Declarations*/ SerialPort sp; BackgroundWorker worker; int attempt = 0; public string[] populateAvailablePorts() //Returns string array of open ports { String[] portsAvailable = SerialPort.GetPortNames(); return portsAvailable; } public void readValues(string selectedPort, ProgressBar progressBar) //Function that sets up serial port and background worker { sp = new SerialPort(selectedPort, 9600, Parity.None, 8, StopBits.One); worker = new BackgroundWorker(); worker.WorkerReportsProgress = true; worker.DoWork += new DoWorkEventHandler(worker_DoWork); worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged); worker.RunWorkerAsync(progressBar); } private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e) //Update user interface with current percentage { ProgressBar progressBar = e.UserState as ProgressBar; App.Current.Dispatcher.Invoke( System.Windows.Threading.DispatcherPriority.Send, new Action( delegate() { progressBar.Value = e.ProgressPercentage; })); } private void worker_DoWork(object sender, DoWorkEventArgs e) //Initial starting point for reading data { startRead((ProgressBar)e.Argument); } private string sendInitial() //Sends ? and returns init ASUTTON { string init = ""; sp.Write("?"); for (int i = 0; i &lt; 7; i++) { try { init += sp.ReadByte().ToString(); } catch { break; } } return init; } private void startRead(ProgressBar progressBar) //Initializes data send and receive { sp.ReadTimeout = 5000; sp.Open(); string init = sendInitial(); if (init == Global.AGENT_RADIO) { sp.Write(Global.READ_VALUES, 0, Global.READ_VALUES.Length); byte key = (byte)sp.ReadByte(); if (Global.START_COMMAND == key) { for (int i = 1; i &lt; 2247; i++) { object progressBarObject = new object(); progressBarObject = progressBar; int progress = (i / 2246) * 100; worker.ReportProgress(progress, progressBarObject); readData(i, progressBar); sp.Write(Global.GO_AHEAD, 0, Global.GO_AHEAD.Length); sp.DiscardInBuffer(); sp.DiscardOutBuffer(); } } else { System.Windows.MessageBox.Show("Connection Failed - Invalid Key: " + key); sp.Close(); } } else { sp.Close(); if (attempt &lt; 3) { attempt++; startRead(progressBar); } else { System.Windows.MessageBox.Show("Connection Failed - Not Agent Radio: " + init); } } } private void readData(int iteration, ProgressBar progress) //Reads data for current iteration { byte value = 0; try { value = (byte)sp.ReadByte(); } catch { sp.Close(); Global.isConnected = false; if (attempt &lt; 3) { attempt++; startRead(progress); } else { System.Windows.MessageBox.Show("Read Timeout - Value Number: " + iteration); App.Current.Shutdown(); } } if (iteration &gt; 0 &amp;&amp; iteration &lt; 385) //read schedule { double pos = (iteration - 1) / 48; int i = (int)Math.Floor(pos); int j = (iteration - 1) - (i * 48); Live.schedule[i, j] = value; } if (iteration &gt; 384 &amp;&amp; iteration &lt; 1285) //read alarm history { double pos = (iteration - 385) / 9; int i = (int)Math.Floor(pos); int j = (iteration - 385) - (i * 9); Live.alarms[i, j] = value; } if (iteration &gt; 1284 &amp;&amp; iteration &lt; 1345) //read error log { double pos = (iteration - 1285) / 6; int i = (int)Math.Floor(pos); int j = (iteration - 1285) - (i * 6); Live.errors[i, j] = value; } if (iteration &gt; 1344 &amp;&amp; iteration &lt; 1945) //read voltage history { double pos = (iteration - 1345) / 6; int i = (int)Math.Floor(pos); int j = (iteration - 1345) - (i * 6); Live.voltage[i, j] = value; } if (iteration &gt; 1944 &amp;&amp; iteration &lt; 1973) //read holidays { Live.holidays[iteration - 1945] = value; } if (iteration &gt; 1972 &amp;&amp; iteration &lt; 2168) //read message sequences { double pos = (iteration - 1973) / 15; int i = (int)Math.Floor(pos); int j = (iteration - 1973) - (i * 15); Live.messages[i, j] = value; } if (iteration &gt; 2167 &amp;&amp; iteration &lt; 2196) //read message info { Live.recordings[iteration - 2168] = value; } if (iteration &gt; 2195 &amp;&amp; iteration &lt; 2246) //read sysval { Live.sysval[iteration - 2196] = value; } if (iteration == 2246 &amp;&amp; value == Global.FINISH_COMMAND) { System.Windows.MessageBox.Show("All values from the device have been received.", "Data Received", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Information); Global.isConnected = true; } } public void disconnect() //Disconnects device { if (Global.isConnected == true) { sp.Write(Global.EXIT_PROGRAM, 0, Global.EXIT_PROGRAM.Length); Global.isConnected = false; } } } } </code></pre>
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    1. USWesley Carlsen
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    1. COYou might want to use `(ProgressBar)e.UserState` instead of `e.UserState as ProgressBar`. The `as` operator is a caryover from VB.NET and IMHO should not be used in C#...
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      1. USCole Johnson
    2. CO@ColeJohnson Can you explain your reasoning why `as` shouldn't be used in C#?
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      1. USdlras2
    3. CO@ColeJohnson: There's nothing wrong with as. It's perfectly good C#.
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      1. USMatt Burland
 

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