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QuestionWindow Not Refreshing Pin
Kevin Marois17-Sep-19 9:03
professionalKevin Marois17-Sep-19 9:03 
I'm working on a custom installation wizard. From it, I'm calling DISM to install IIS and ASP.Net if they're not installed. All the code in the installer class works fine when called from a console app. I'm now trying to put a simple UI on it.

There are 2 steps. Each step raises the event 'CurrentTaskChanged' with text "Installing IIS" or "Installing ASP.Net", and then during installation it raises a ProgressChanged event to send progress to the UI.

The problem is that none of the UI updates happen until the after the entire install process finishes.

Installer Class Code
public static void Install()

private static void InstallIIS()
    InstallFeature("IIS", "/Online /Enable-Feature /FeatureName:IIS-DefaultDocument /All");

private static void InstallASPDotNet()
    InstallFeature("ASP.Net", "/Online /Enable-Feature /FeatureName:IIS-ASPNET45 /All");

private static void InstallFeature(string featureName, string args)
        // Raise the task changed event so the UI shows what is installing
        CurrentTaskChanged($"Installing {featureName}");

        string dism = Path.Combine(Environment.ExpandEnvironmentVariables("%windir%"), "system32", "dism.exe");
        if (Environment.Is64BitOperatingSystem && !Environment.Is64BitProcess)
            dism = Path.Combine(Environment.ExpandEnvironmentVariables("%windir%"), "sysnative", "dism.exe");

        var process = new Process();
        var startInfo = new ProcessStartInfo
            UseShellExecute = false,
            CreateNoWindow = false,
            RedirectStandardOutput = true,
            FileName = dism,
            Arguments = args

        process.StartInfo = startInfo;
        process.OutputDataReceived += (sender, e) => HandleDISMOutput(e.Data);
        process.StartInfo.Verb = "runas";
    catch (Exception e)

private static void HandleDISMOutput(object data)
    if (data != null)
        var info = data.ToString();

        if (info.Contains("%"))
            // Parse out the percent digits
            info = info.Replace('[', ' ');
            info = info.Replace(']', ' ');
            info = info.Replace('=', ' ');
            info = info.Replace(" ", "");
            info = info.Replace("%", "");

            double.TryParse(info, out double percent);

            // Raise the percent completed event to update the progress bar in the UI
UI Code
private void InstallExecuted()
    RemoteServicesInstaller.CurrentTaskChanged += CurrentTaskChanged;
    RemoteServicesInstaller.ProgressUpdated += ProgressUpdated;

private void CurrentTaskChanged(string action)
    InstallAction = action;

private void ProgressUpdated(double percent)
    InstallPercent = percent;

The two handlers here at the bottom DO get called - the UI just doesn't update during install. I can see the Debug.Print code sending the percent to the debug console. The UI just doesnt refresh.

Anyone have any thougts? Thanks!
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

AnswerRe: Window Not Refreshing Pin
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