Addressed trim warnings for Sentry.Maui

Author: jamescrosswell

src/Sentry.Maui/Internal/PageNavigationExtensions.cs

@@ -1,16 +1,38 @@
+using Sentry.Internal;
+
 namespace Sentry.Maui.Internal;
 
 internal static class PageNavigationExtensions
 {
-    private static readonly PropertyInfo? DestinationPageProperty =
-        typeof(NavigatedFromEventArgs).GetProperty("DestinationPage", BindingFlags.Instance | BindingFlags.NonPublic);
+    private static readonly PropertyInfo? DestinationPageProperty;
+    private static readonly PropertyInfo? PreviousPageProperty;
+
+    [UnconditionalSuppressMessage("Trimming", "IL2075: DynamicallyAccessedMembers", Justification = AotHelper.AvoidAtRuntime)]
+    static PageNavigationExtensions()
+    {
+        if (AotHelper.IsTrimmed)
+        {
+            return;
+        }
 
-    private static readonly PropertyInfo? PreviousPageProperty =
-        typeof(NavigatedToEventArgs).GetProperty("PreviousPage", BindingFlags.Instance | BindingFlags.NonPublic);
+        var eventArgsType = typeof(NavigatedFromEventArgs);
+        DestinationPageProperty =
+            eventArgsType.GetProperty("DestinationPage", BindingFlags.Instance | BindingFlags.NonPublic);
+        PreviousPageProperty =
+            eventArgsType.GetProperty("PreviousPage", BindingFlags.Instance | BindingFlags.NonPublic);
+    }
 
+    /// <summary>
+    /// Reads the (internal) NavigatedFromEventArgs.DestinationPage property via reflection.
+    /// Note that this will return null if trimming is enabled.
+    /// </summary>
     public static Page? GetDestinationPage(this NavigatedFromEventArgs eventArgs) =>
         DestinationPageProperty?.GetValue(eventArgs) as Page;
 
+    /// <summary>
+    /// Reads the (internal) NavigatedFromEventArgs.PreviousPage property via reflection.
+    /// Note that this will return null if trimming is enabled.
+    /// </summary>
     public static Page? GetPreviousPage(this NavigatedToEventArgs eventArgs) =>
         PreviousPageProperty?.GetValue(eventArgs) as Page;
 }

test/Sentry.TrimTest/Sentry.TrimTest.csproj

@@ -13,7 +13,9 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\src\Sentry\Sentry.csproj" />
+    <ProjectReference Include="..\..\src\Sentry.Maui\Sentry.Maui.csproj" />
     <TrimmerRootAssembly Include="Sentry" />
+    <TrimmerRootAssembly Include="Sentry.Maui" />
   </ItemGroup>
 
 </Project>