How do I check if the app is installed via Squirrel?

[ChargingBulle]

I want to distribute my app as Squirrel edition and Standalone edition (the standalone wont be able to update)

How can I find out weather an app is installed via Squirrel or not?
My current method of determining isn't very good especially becaue you guys just used System.Execption instead of something like NonSquirrelInstallationException

        UpdateManager updateManager;

        try
        {
            updateManager = new UpdateManager("https://company.com/software/releases");
        }
        catch (Exception exe)
        {
            if (exe.Message.Contains("Update.exe not found"))
            {
                //This isn't an squirrel installed app
                return;
            }

            //throw everything else
            throw exe;
        }   

[ChargingBulle]

If you don't have a good solution I would like it if you could implement one

[anaisbetts]

var assembly = Assembly.GetEntryAssembly();

var updateDotExe = Path.Combine(
  Path.GetDirectoryName(assembly.Location), 
  '..', 'Update.exe');

var isInstalled = File.Exists(updateDotExe);

[ChargingBulle]

oh thank you

[quasarea]

It looks like this does the job:

var updates = await updateManager.CheckForUpdate();
if (updates.CurrentlyInstalledVersion == null) { 
  //Seems like this is not a squirrel installation, running within VisualStudio perhaps?
  MessageBox.Show("Unknown current version - possibly application was not installed correctly");
} else if (updates.ReleasesToApply.Any()) {
  //Squirrel installation with updates to apply
  await updateManager.DownloadReleases(updates.ReleasesToApply);
  await updateManager.ApplyReleases(updates);
  await updateManager.UpdateApp();
}

[BreakPointSoftware]

It looks like this does the job:

var updates = await updateManager.CheckForUpdate();
if (updates.CurrentlyInstalledVersion == null) { 
  //Seems like this is not a squirrel installation, running within VisualStudio perhaps?
  MessageBox.Show("Unknown current version - possibly application was not installed correctly");
} else if (updates.ReleasesToApply.Any()) {
  //Squirrel installation with updates to apply
  await updateManager.DownloadReleases(updates.ReleasesToApply);
  await updateManager.ApplyReleases(updates);
  await updateManager.UpdateApp();
}

This is a more reliable way to check, although both are problematic as update.exe can be present if the application is not installed (for example running in visual studio). Although update.exe is present, other dependent files are not (for example the releases file) if not 'installed'.