fix: App blanks out when navigating to invalid route

src/Uno.Extensions.Navigation.UI/RouteResolverDefault.cs

@@ -55,9 +55,7 @@ private RouteInfo[] DefaultMapping(string? path = null, Type? view = null, Type?
 
 	protected virtual RouteInfo? InternalDefaultMapping(string? path = null, Type? view = null, Type? viewModel = null)
 	{
-		if (path is null &&
-			view is null &&
-			viewModel is null)
+		if (path is null && view is null && viewModel is null)
 		{
 			return default;
 		}
@@ -71,17 +69,17 @@ view is null &&
 		// Trim any qualifiers
 		path = path.ExtractBase(out _, out _);
 
-		// If no path is provided, attempt to get a path
-		// from the view or viewmodel type provided
+		// If no path is provided, attempt to get a path from the view or viewmodel type provided
 		if (string.IsNullOrWhiteSpace(path))
 		{
 			path = PathFromTypes(view, viewModel);
 		}
 
 		// If path is still null, we can't build a mapping, so just return
-		if (path is null ||
-			string.IsNullOrWhiteSpace(path))
+		if (path is null || string.IsNullOrWhiteSpace(path))
 		{
+			if (Logger.IsEnabled(LogLevel.Warning))
+				Logger.LogWarningMessage($"Unable to resolve path from types. Path: '{path}', View: '{view?.Name}', ViewModel: '{viewModel?.Name}'");
 			return default;
 		}
 
@@ -96,32 +94,40 @@ view is null &&
 		if (viewMap is not null)
 		{
 			var viewFunc = (viewMap.View is not null) ?
-										() => viewMap.View :
-										viewMap.ViewSelector;
+										   () => viewMap.View :
+										   viewMap.ViewSelector;
 			var defaultMapFromViewMap = new RouteInfo(
-												Path: path,
-												View: viewFunc,
-												ViewAttributes: viewMap.ViewAttributes,
-												ViewModel: viewMap.ViewModel,
-												Data: viewMap.Data?.Data,
-												ToQuery: viewMap?.Data?.UntypedToQuery,
-												FromQuery: viewMap?.Data?.UntypedFromQuery,
-												ResultData: viewMap?.ResultData,
-												IsDialogViewType: () =>
-												{
-													return IsDialogViewType(viewFunc?.Invoke());
-												});
+										   Path: path,
+										   View: viewFunc,
+										   ViewAttributes: viewMap.ViewAttributes,
+										   ViewModel: viewMap.ViewModel,
+										   Data: viewMap.Data?.Data,
+										   ToQuery: viewMap?.Data?.UntypedToQuery,
+										   FromQuery: viewMap?.Data?.UntypedFromQuery,
+										   ResultData: viewMap?.ResultData,
+										   IsDialogViewType: () =>
+										   {
+											   return IsDialogViewType(viewFunc?.Invoke());
+										   });
 			Mappings.Add(defaultMapFromViewMap);
 			if (Logger.IsEnabled(LogLevel.Debug)) Logger.LogDebugMessage($"Created default mapping from viewmap - Path '{defaultMapFromViewMap.Path}'");
 			return defaultMapFromViewMap;
 		}
 
-		if (Logger.IsEnabled(LogLevel.Information)) Logger.LogInformationMessage($"For better performance (avoid reflection), create mapping for for path '{path}', view '{view?.Name}', view model '{viewModel?.Name}'");
+		if (Logger.IsEnabled(LogLevel.Information))
+			Logger.LogInformationMessage($"For better performance (avoid reflection), create mapping for path '{path}', view '{view?.Name}', view model '{viewModel?.Name}'");
 
 		if (view is null)
 		{
 			var trimmedPath = TrimSuffices(path, ViewModelSuffixes);
 			view = TypeFromPath(trimmedPath, true, ViewSuffixes, type => type.IsSubclassOf(typeof(FrameworkElement)));
+
+			if (view is not null)
+			{
+				if (Logger.IsEnabled(LogLevel.Information))
+					Logger.LogInformationMessage($"Potential conflict detected: The route '{path}' resolved to a common control or class name '{view.Name}'. This could lead to unexpected behavior.");
+			}
+
 		}
 
 		if (viewModel is null)
@@ -130,8 +136,7 @@ view is null &&
 			viewModel = TypeFromPath(trimmedPath, false, ViewModelSuffixes);
 		}
 
-		if (path is not null &&
-			!string.IsNullOrWhiteSpace(path))
+		if (path is not null && !string.IsNullOrWhiteSpace(path))
 		{
 			var defaultMap = new RouteInfo(path, View: () => view, ViewModel: viewModel, IsDialogViewType: () =>
 			{
@@ -142,14 +147,16 @@ view is null &&
 			return defaultMap;
 		}
 
-		if (Logger.IsEnabled(LogLevel.Warning)) Logger.LogWarningMessage($"Unable to create default mapping");
+		if (Logger.IsEnabled(LogLevel.Warning)) Logger.LogWarningMessage($"Unable to create default mapping for path '{path}', view '{view?.Name}', view model '{viewModel?.Name}'");
 		return default;
 	}
 
 	private Type? TypeFromPath(string path, bool allowMatchExact, IEnumerable<string> suffixes, Func<Type, bool>? condition = null)
 	{
 		if (string.IsNullOrWhiteSpace(path))
 		{
+			if (Logger.IsEnabled(LogLevel.Warning))
+				Logger.LogWarningMessage($"Navigation failed: Empty or null path provided.");
 			return default;
 		}
 
@@ -168,6 +175,8 @@ view is null &&
 				}
 			}
 		}
+		if (Logger.IsEnabled(LogLevel.Warning))
+			Logger.LogWarningMessage($"Navigation failed: Could not resolve type for path '{path}'.");
 
 		return null;
 	}

src/Uno.Extensions.Navigation/RouteExtensions.cs

@@ -37,8 +37,7 @@ public static bool IsClearBackstack(this Route route) =>
 			nextQualifier = qualifierMatch.Value;
 		}
 
-		qualifierMatch = alphaRegex.Match(path);
-		var routeBase = qualifierMatch.Success ? qualifierMatch.Value : String.Empty;
+		var routeBase = path.Split("/").FirstOrDefault();
 		if (routeBase is { Length: > 0 })
 		{
 			if (path.Length > routeBase.Length + 1)

testing/TestHarness/TestHarness.Core/TestSections.cs

@@ -6,6 +6,7 @@ public enum TestSections
 	Navigation_ContentControl,
 	Navigation_PageNavigation,
 	Navigation_PageNavigationRegistered,
+	Navigation_RoutesNavigation,
 	Navigation_Dialogs,
 	Navigation_Responsive,
 	Navigation_ListToDetails,

testing/TestHarness/TestHarness.UITest/Ext/Navigation/RoutesNavigation/Given_RoutesNavigation.cs

@@ -0,0 +1,74 @@
+namespace TestHarness.UITest;
+
+public class Given_RoutesNavigation : NavigationTestBase
+{
+	[Test]
+	public async Task When_Navigate_To_SamplePage()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("SamplePageButton");
+
+		App.WaitElement("SamplePage");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_SecondPage()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("SecondPageButton");
+
+		App.WaitElement("SecondPage");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_Unregistered_SecondPage()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("SecondPageUnregisteredButton");
+
+		App.WaitElement("SecondPage");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_List_Template()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("ListTemplateButton");
+
+		App.WaitElement("ListTemplate");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_ItemsPage()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("ItemsPageButton");
+
+		App.WaitElement("ItemsPage");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_MyControl()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("MyControlButton");
+
+		App.WaitElement("MyControlView");
+	}
+
+	[Test]
+	public async Task When_Navigate_To_MyControlView()
+	{
+		InitTestSection(TestSections.Navigation_RoutesNavigation);
+
+		App.WaitThenTap("MyControlViewButton");
+
+		App.WaitElement("MyControlView");
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/HomePage.xaml

@@ -0,0 +1,41 @@
+<Page x:Class="TestHarness.Ext.Navigation.RoutesNavigation.HomePage"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:TestHarness.Ext.Navigation.RoutesNavigation"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  mc:Ignorable="d"
+	  d:DesignHeight="300"
+	  d:DesignWidth="400">
+
+	<Grid>
+		<StackPanel Grid.Row="1"
+					Orientation="Vertical"
+					HorizontalAlignment="Center">
+			<Button Content="SamplePage"
+					uen:Navigation.Request="Sample"
+					AutomationProperties.AutomationId="SamplePageButton" />
+			<Button Content="SecondPage"
+					uen:Navigation.Request="Second"
+					AutomationProperties.AutomationId="SecondPageButton" />
+			<Button Content="Second Page (not registered)"
+					uen:Navigation.Request="SecondPage"
+					AutomationProperties.AutomationId="SecondPageUnregisteredButton" />
+			<Button Content="List_Template"
+					uen:Navigation.Request="List_Template"
+					AutomationProperties.AutomationId="ListTemplateButton" />
+			<Button Content="ItemsPage"
+					uen:Navigation.Request="Items"
+					AutomationProperties.AutomationId="ItemsPageButton" />
+			<Button Content="MyControl"
+					uen:Navigation.Request="MyControl"
+					AutomationProperties.AutomationId="MyControlButton" />
+			<Button Content="MyControlView"
+					uen:Navigation.Request="MyControlView"
+					AutomationProperties.AutomationId="MyControlViewButton" />
+
+		</StackPanel>
+
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/HomePage.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.RoutesNavigation;
+
+public sealed partial class HomePage : Page
+{
+	public HomePage()
+	{
+		this.InitializeComponent();
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/ItemsPage.xaml

@@ -0,0 +1,27 @@
+<Page x:Class="TestHarness.Ext.Navigation.RoutesNavigation.ItemsPage"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:TestHarness.Ext.Navigation.RoutesNavigation"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  mc:Ignorable="d"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+		</Grid.RowDefinitions>
+		<utu:NavigationBar Content="Items Page"
+						   AutomationProperties.AutomationId="ItemsPage" />
+		<StackPanel HorizontalAlignment="Center"
+					VerticalAlignment="Center"
+					Grid.Row="1">
+			<Button AutomationProperties.AutomationId="BackButton"
+					Content="Back"
+					uen:Navigation.Request="-" />
+		</StackPanel>
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/ItemsPage.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.RoutesNavigation;
+
+public sealed partial class ItemsPage : Page
+{
+	public ItemsPage()
+	{
+		this.InitializeComponent();
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/ListTemplate.xaml

@@ -0,0 +1,27 @@
+<Page x:Class="TestHarness.Ext.Navigation.RoutesNavigation.ListTemplate"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:TestHarness.Ext.Navigation.RoutesNavigation"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  mc:Ignorable="d"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+		</Grid.RowDefinitions>
+		<utu:NavigationBar Content="List Template"
+						   AutomationProperties.AutomationId="ListTemplate" />
+		<StackPanel HorizontalAlignment="Center"
+					VerticalAlignment="Center"
+					Grid.Row="1">
+			<Button AutomationProperties.AutomationId="BackButton"
+					Content="Back"
+					uen:Navigation.Request="-" />
+		</StackPanel>
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/ListTemplate.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.RoutesNavigation;
+
+public sealed partial class ListTemplate : Page
+{
+	public ListTemplate()
+	{
+		this.InitializeComponent();
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/MyControlView.xaml

@@ -0,0 +1,27 @@
+<Page x:Class="TestHarness.Ext.Navigation.RoutesNavigation.MyControlView"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:TestHarness.Ext.Navigation.RoutesNavigation"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  mc:Ignorable="d"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+		</Grid.RowDefinitions>
+		<utu:NavigationBar Content="My Control View"
+						   AutomationProperties.AutomationId="MyControlView" />
+		<StackPanel HorizontalAlignment="Center"
+					VerticalAlignment="Center"
+					Grid.Row="1">
+			<Button AutomationProperties.AutomationId="BackButton"
+					Content="Back"
+					uen:Navigation.Request="-" />
+		</StackPanel>
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/RoutesNavigation/MyControlView.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.RoutesNavigation;
+
+public partial class MyControlView : Page
+{
+	public MyControlView()
+	{
+		InitializeComponent();
+	}
+}