static UnoXamlHostBase()
{
//TODO: These lines should be set in a different location, possibly in a more general way (for multi-window support) https://github.com/unoplatform/uno/issues/8978
Windows.UI.Core.CoreDispatcher.DispatchOverride = d =>
global::System.Windows.Application.Current.Dispatcher.BeginInvoke(d);
Windows.UI.Core.CoreDispatcher.HasThreadAccessOverride =
global::System.Windows.Application.Current.Dispatcher.CheckAccess;
if (MetadataProviderDiscovery.MetadataProviderFactory is null)
{
MetadataProviderDiscovery.MetadataProviderFactory = type =>
{
if (typeof(WUX.Application).IsAssignableFrom(type))
{
WUX.Application application = null;
WUX.Application.Start(_ =>
{
application = (WUX.Application)Activator.CreateInstance(type);
});
return((WUX.Markup.IXamlMetadataProvider)application);
}
return(null);
};
}
_metadataContainer = XamlApplicationExtensions.GetOrCreateXamlMetadataContainer();
}
/// <summary>
/// Gets and returns the current UWP XAML Application instance in a reference parameter.
/// If the current XAML Application instance has not been created for the process (is null),
/// a new <see cref="Microsoft.Toolkit.Win32.UI.XamlHost.XamlApplication" /> instance is created and returned.
/// </summary>
/// <returns>The instance of <seealso cref="XamlApplication"/></returns>
public static IXamlMetadataContainer GetOrCreateXamlMetadataContainer()
{
// Instantiation of the application object must occur before creating the DesktopWindowXamlSource instance.
// DesktopWindowXamlSource will create a generic Application object unable to load custom UWP XAML metadata.
if (_metadataContainer == null)
{
// Create a custom UWP XAML Application object that implements reflection-based XAML metadata probing.
try
{
var app = new XamlApplication();
app.MetadataProviders.AddRange(MetadataProviderDiscovery.DiscoverMetadataProviders());
return(app);
}
catch
{
_metadataContainer = WUX.Application.Current as IXamlMetadataContainer;
}
}
var xamlApplication = _metadataContainer as XamlApplication;
if (xamlApplication != null && xamlApplication.IsDisposed)
{
throw new ObjectDisposedException(typeof(XamlApplication).FullName);
}
return(_metadataContainer);
}
/// <summary>
/// Gets and returns the current UWP XAML Application instance in a reference parameter.
/// If the current XAML Application instance has not been created for the process (is null),
/// a new <see cref="Uno.UI.XamlHost.XamlApplication" /> instance is created and returned.
/// </summary>
/// <returns>The instance of <seealso cref="XamlApplication"/></returns>
public static IXamlMetadataContainer GetOrCreateXamlMetadataContainer()
{
// Instantiation of the application object must occur before creating the DesktopWindowXamlSource instance.
// DesktopWindowXamlSource will create a generic Application object unable to load custom UWP XAML metadata.
if (_metadataContainer == null && !_initialized)
{
_initialized = true;
// Create a custom UWP XAML Application object that implements reflection-based XAML metadata probing.
try
{
_metadataContainer = GetCurrentProvider();
if (_metadataContainer == null)
{
var providers = MetadataProviderDiscovery.DiscoverMetadataProviders().ToList();
_metadataContainer = GetCurrentProvider();
if (_metadataContainer == null)
{
_metadataContainer = new XamlApplication(providers);
return(_metadataContainer);
}
}
else
{
return(_metadataContainer);
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
_metadataContainer = GetCurrentProvider();
}
}
var xamlApplication = _metadataContainer as XamlApplication;
if (xamlApplication != null && xamlApplication.IsDisposed)
{
throw new ObjectDisposedException(typeof(XamlApplication).FullName);
}
return(_metadataContainer);
}
static WindowsXamlHostBase()
{
_metadataContainer = XamlApplicationExtensions.GetOrCreateXamlMetadataContainer();
}
