Change warning to throwing exception for NotFound/NotFoundPage validation

Co-authored-by: ilonatommy <[email protected]>

Author: Copilot

src/Components/Components/src/Routing/Router.cs

@@ -147,7 +147,7 @@ public async Task SetParametersAsync(ParameterView parameters)
 #pragma warning disable CS0618 // Type or member is obsolete
             if (NotFound != null)
             {
-                Log.BothNotFoundParametersSet(_logger);
+                throw new InvalidOperationException("Both NotFound and NotFoundPage parameters are set on Router component. NotFoundPage is preferred and NotFound will be deprecated. Consider using only NotFoundPage.");
             }
 #pragma warning restore CS0618 // Type or member is obsolete
             if (!typeof(IComponent).IsAssignableFrom(NotFoundPage))
@@ -451,8 +451,5 @@ private static partial class Log
         [LoggerMessage(4, LogLevel.Debug, $"Displaying {nameof(NotFound)} on request", EventName = "DisplayingNotFoundOnRequest")]
         internal static partial void DisplayingNotFound(ILogger logger);
 #pragma warning restore CS0618 // Type or member is obsolete
-
-        [LoggerMessage(5, LogLevel.Warning, "Both NotFound and NotFoundPage parameters are set on Router component. NotFoundPage is preferred and NotFound will be deprecated. Consider using only NotFoundPage.", EventName = "BothNotFoundParametersSet")]
-        internal static partial void BothNotFoundParametersSet(ILogger logger);
     }
 }

src/Components/Components/test/Routing/RouterTest.cs

@@ -268,12 +268,11 @@ await _renderer.Dispatcher.InvokeAsync(() =>
     }
 
     [Fact]
-    public async Task LogsWarningWhenBothNotFoundAndNotFoundPageAreSet()
+    public async Task ThrowsExceptionWhenBothNotFoundAndNotFoundPageAreSet()
     {
         // Arrange
-        var logger = new TestLogger<Router>();
         var services = new ServiceCollection();
-        services.AddSingleton<ILoggerFactory>(new TestLoggerFactory(logger));
+        services.AddSingleton<ILoggerFactory>(NullLoggerFactory.Instance);
         services.AddSingleton<NavigationManager>(_navigationManager);
         services.AddSingleton<INavigationInterception, TestNavigationInterception>();
         services.AddSingleton<IScrollToLocationHash, TestScrollToLocationHash>();
@@ -293,15 +292,13 @@ public async Task LogsWarningWhenBothNotFoundAndNotFoundPageAreSet()
             { nameof(Router.NotFoundPage), typeof(NotFoundTestComponent) }
         };
 
-        // Act
-        await renderer.Dispatcher.InvokeAsync(() =>
-            router.SetParametersAsync(ParameterView.FromDictionary(parameters)));
+        // Act & Assert
+        var exception = await Assert.ThrowsAsync<InvalidOperationException>(async () =>
+            await renderer.Dispatcher.InvokeAsync(() =>
+                router.SetParametersAsync(ParameterView.FromDictionary(parameters))));
 
-        // Assert
-        var warningLogs = logger.LogEntries.Where(entry => entry.LogLevel == LogLevel.Warning).ToList();
-        Assert.Single(warningLogs);
-        Assert.Contains("Both NotFound and NotFoundPage parameters are set on Router component", warningLogs[0].Message);
-        Assert.Contains("NotFoundPage is preferred and NotFound will be deprecated", warningLogs[0].Message);
+        Assert.Contains("Both NotFound and NotFoundPage parameters are set on Router component", exception.Message);
+        Assert.Contains("NotFoundPage is preferred and NotFound will be deprecated", exception.Message);
     }
 
     internal class TestNavigationManager : NavigationManager