fix: Source context for class libraries when running on Android in Release mode

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Sentry now decompresses Request bodies in ASP.NET Core when RequestDecompression middleware is enabled ([#4315](https://github.com/getsentry/sentry-dotnet/pull/4315))
 - Custom ISentryEventProcessors are now run for native iOS events ([#4318](https://github.com/getsentry/sentry-dotnet/pull/4318))
 - Crontab validation when capturing checkins ([#4314](https://github.com/getsentry/sentry-dotnet/pull/4314))
+- Source context for class libraries when running on Android in Release mode ([#4294](https://github.com/getsentry/sentry-dotnet/pull/4294))
 - Native AOT: link to static `lzma` on Linux/MUSL ([#4326](https://github.com/getsentry/sentry-dotnet/pull/4326))
 - AppDomain.CurrentDomain.ProcessExit hook is now removed on shutdown ([#4323](https://github.com/getsentry/sentry-dotnet/pull/4323))
 

src/Sentry.Android.AssemblyReader/V2/AndroidAssemblyStoreReaderV2.cs

@@ -100,11 +100,19 @@ public static bool TryReadStore(string inputFile, IList<string> supportedAbis, D
             return assembly;
         }
 
+        // If the assembly name ends with .dll or .exe, try to find it without the extension.
         if ((IsFileType(".dll") || IsFileType(".exe")) && FindBestAssembly(name[..^4], out assembly))
         {
             return assembly;
         }
 
+        // Conversely, if there is no extension, try with the dll extension (sometimes required for class libraries).
+        // See: https://github.com/getsentry/sentry-dotnet/issues/4278#issuecomment-2986009125
+        if (!IsFileType(".dll") && !IsFileType(".exe") && FindBestAssembly(name + ".dll", out assembly))
+        {
+            return assembly;
+        }
+
         return null;
 
         bool IsFileType(string extension)
@@ -119,10 +127,12 @@ private bool FindBestAssembly(string name, out ExplorerStoreItem? explorerAssemb
         {
             if (explorer.AssembliesByName?.TryGetValue(name, out var assembly) is true)
             {
+                _logger?.Invoke("Found best assembly {0} in APK AssemblyStore for target arch {1}", name, explorer.TargetArch);
                 explorerAssembly = new(explorer, assembly);
                 return true;
             }
         }
+        _logger?.Invoke("No best assembly for {0} in APK AssemblyStore", name);
         explorerAssembly = null;
         return false;
     }

src/Sentry.Android.AssemblyReader/V2/AssemblyStoreExplorer.cs

@@ -33,6 +33,7 @@ private AssemblyStoreExplorer(Stream storeStream, string path, DebugLogger? logg
         {
             foreach (var item in Assemblies)
             {
+                logger?.Invoke("Assembly {0} indexed from AssemblyStore {1}", item.Name, path);
                 dict.Add(item.Name, item);
             }
         }