object AssertApplicationRequirementsAsync(object unused)
{
if (IsCanceledOrShuttingDown)
return null;
if (CheckAccess()) // initial call by Dispatcher?
{ // Do a callback to a worker thread
// Status bar is set on the main thread (here) to avoid switching.
SetStatusText(SR.Get(SRID.HostingStatusVerifying));
// Creating an STA thread to get CLR's 'selectively permeable' managed locks. This is needed to
// enable the dispatching of the window event hook calls needed to intercept the showing of the
// ClickOnce elevation prompt. See PresentationAppDomainManager.DetermineApplicationTrust().
Thread thread = new Thread(() => AssertApplicationRequirementsAsync(null));
thread.SetApartmentState(ApartmentState.STA);
thread.Name = "IPHM.AAR thread";
thread.Start();
}
else // on a worker thread
{
try
{
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordHosting | EventTrace.Keyword.KeywordPerf, EventTrace.Level.Verbose, EventTrace.Event.WpfHost_AssertAppRequirementsStart);
_hostingManager.AssertApplicationRequirements();
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordHosting | EventTrace.Keyword.KeywordPerf, EventTrace.Level.Verbose, EventTrace.Event.WpfHost_AssertAppRequirementsEnd);
// Switch to the main thread to update the status message. This is necessary because the
// native IBCS and INativeProgressPage interfaces are not marshalable.
Dispatcher.BeginInvoke(DispatcherPriority.Normal, new DispatcherOperationCallback(
delegate(object unused3)
{
if (_isInAsynchronousOperation)
{
ShowDownloadingStatusMessage();
}
return null;
}), null);
}
catch (Exception exception0)
{
if (exception0.GetType() == typeof(InvalidOperationException) &&
exception0.Source == "System.Deployment")
{ // "No further operations are possible with this instance":
// This condition can occur when IPHM.AssertApplicationRequirements() is called after application
// downloading has failed. That error may or may not have been reported to the main thread yet.
// Presumably, it is the "real" error that failed deployment and should be reported to the user.
// That's why no further handling is done here, and _assertAppRequirementsFailed is not set.
}
else
{
_assertAppRequirementsFailed = true;
// Note that an exception allowed to escape from here will be caught by the thread-pool manager.
// That's why all further processing is moved to the main thread.
Dispatcher.BeginInvoke(DispatcherPriority.Send, new DispatcherOperationCallback(
delegate(object exceptionObj)
{
Exception exception = (Exception)exceptionObj;
if (CriticalExceptions.IsCriticalException(exception))
{ // Wrap the exception object in order to preserve the original callstack.
throw new DeploymentException(SR.Get(SRID.UnknownErrorText), exception);
}
GetManifestCompletedEventArgs args = _getManifestCompletedEventArgs;
string version = null;
if (exception is TrustNotGrantedException)
{
version = GetMissingCustomPermissionVersion(args.ApplicationManifest);
if (!string.IsNullOrEmpty(version))
{
exception = new DependentPlatformMissingException();
}
}
HandleError(exception, args.LogFilePath, args.SupportUri, version);
return null;
}), exception0);
}
}
finally
{
// Synchronize with DoDownloadApplicationCompleted(). [See explanation there.]
_assertAppRequirementsEvent.Set();
}
}
return null;
}
private void DisplayPlatformDetectionFailureUI(DependentPlatformMissingException ex)
{
Uri supportUrl = null;
if (this._fullTrust)
{
supportUrl = ex.SupportUrl;
}
this._ui.ShowPlatform(ex.Message, supportUrl);
}