Dispose empty sets and try/catch exceptions (#10955)

Workaround for xamarin/xamarin-macios#13704
dotnet · Oct 27, 2022 · 10a8bba · 10a8bba
1 parent bc04bf1
commit 10a8bba
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Showing 2 changed files with 39 additions and 11 deletions.
diff --git a/src/Core/src/Platform/iOS/ApplicationExtensions.cs b/src/Core/src/Platform/iOS/ApplicationExtensions.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Runtime.Versioning;
 using Foundation;
 using Microsoft.Extensions.Logging;
@@ -57,14 +58,23 @@ public static void CreatePlatformWindow(this IUIWindowSceneDelegate sceneDelegat
 				dicts.Add(session.UserInfo);
 			if (session.StateRestorationActivity?.UserInfo is not null)
 				dicts.Add(session.StateRestorationActivity.UserInfo);
-			if (connectionOptions.UserActivities is not null)
+			try
 			{
-				foreach (var u in connectionOptions.UserActivities)
+				using var activities = connectionOptions.UserActivities;
+				if (activities is not null)
 				{
-					if (u is NSUserActivity userActivity && userActivity.UserInfo is not null)
-						dicts.Add(userActivity.UserInfo);
+					foreach (var u in activities)
+					{
+						if (u is NSUserActivity userActivity && userActivity.UserInfo is not null)
+							dicts.Add(userActivity.UserInfo);
+					}
 				}
 			}
+			catch (InvalidCastException)
+			{
+				// HACK: Workaround for https://github.com/xamarin/xamarin-macios/issues/13704
+				//       This only throws if the collection is empty.
+			}
 
 			var window = CreatePlatformWindow(application, scene as UIWindowScene, dicts.ToArray());
 			if (window is not null)

diff --git a/src/Essentials/src/Platform/WindowStateManager.ios.cs b/src/Essentials/src/Platform/WindowStateManager.ios.cs
@@ -101,9 +101,18 @@ public void Init(Func<UIViewController?>? getCurrentUIViewController) =>
 			// if we have scene support, use that
 			if (OperatingSystem.IsIOSVersionAtLeast(13) || OperatingSystem.IsMacCatalystVersionAtLeast(13))
 			{
-				var scenes = UIApplication.SharedApplication.ConnectedScenes;
-				var windowScene = scenes.ToArray<UIWindowScene>().FirstOrDefault();
-				return windowScene?.Windows.FirstOrDefault();
+				try
+				{
+					using var scenes = UIApplication.SharedApplication.ConnectedScenes;
+					var windowScene = scenes.ToArray<UIWindowScene>().FirstOrDefault();
+					return windowScene?.Windows.FirstOrDefault();
+				}
+				catch (InvalidCastException)
+				{
+					// HACK: Workaround for https://github.com/xamarin/xamarin-macios/issues/13704
+					//       This only throws if the collection is empty.
+					return null;
+				}
 			}
 
 			// use the windows property (up to 13.0)
@@ -115,9 +124,18 @@ public void Init(Func<UIViewController?>? getCurrentUIViewController) =>
 			// if we have scene support, use that
 			if (OperatingSystem.IsIOSVersionAtLeast(13) || OperatingSystem.IsMacCatalystVersionAtLeast(13))
 			{
-				var scenes = UIApplication.SharedApplication.ConnectedScenes;
-				var windowScene = scenes.ToArray<UIWindowScene>().FirstOrDefault();
-				return windowScene?.Windows;
+				try
+				{
+					using var scenes = UIApplication.SharedApplication.ConnectedScenes;
+					var windowScene = scenes.ToArray<UIWindowScene>().FirstOrDefault();
+					return windowScene?.Windows;
+				}
+				catch (InvalidCastException)
+				{
+					// HACK: Workaround for https://github.com/xamarin/xamarin-macios/issues/13704
+					//       This only throws if the collection is empty.
+					return null;
+				}
 			}
 
 			// use the windows property (up to 15.0)