feat: Add public API for checking unhandled exceptions

src/Sentry/SentryEvent.cs

@@ -208,16 +208,41 @@ internal ExceptionType GetExceptionType()
 
     private bool HasException() => Exception is not null || SentryExceptions?.Any() == true;
 
-    private bool HasUnhandledException()
+    internal bool HasUnhandledException()
     {
+        // Check if the original exception was marked as unhandled
         if (Exception?.Data[Mechanism.HandledKey] is false)
         {
             return true;
         }
 
+        // Check if any of the Sentry exceptions have an unhandled mechanism
         return SentryExceptions?.Any(e => e.Mechanism is { Handled: false }) ?? false;
     }
 
+    internal bool HasUnhandledTerminalException()
+    {
+        // Check if the original exception was unhandled and not explicitly marked as non-terminal
+        if (Exception?.Data[Mechanism.HandledKey] is false)
+        {
+            // If it's unhandled but explicitly marked as non-terminal, return false
+            if (Exception.Data[Mechanism.TerminalKey] is false)
+            {
+                return false;
+            }
+
+            // Otherwise, unhandled exceptions are terminal by default
+            return true;
+        }
+
+        // Check if any Sentry exceptions are unhandled and terminal
+        // (handled: false and terminal: not explicitly false)
+        return SentryExceptions?.Any(e =>
+            e.Mechanism is { Handled: false } &&
+            e.Mechanism.Terminal != false
+        ) ?? false;
+    }
+
     private bool HasUnhandledNonTerminalException()
     {
         // Generally, an unhandled exception is considered terminal.

src/Sentry/SentryEventExtensions.cs

@@ -0,0 +1,80 @@
+namespace Sentry;
+
+/// <summary>
+/// Extension methods for <see cref="SentryEvent"/>.
+/// </summary>
+public static class SentryEventExtensions
+{
+    /// <summary>
+    /// Determines whether this event was created from an unhandled exception.
+    /// </summary>
+    /// <param name="event">The Sentry event.</param>
+    /// <returns>
+    /// <c>true</c> if the event was created from an unhandled exception; otherwise, <c>false</c>.
+    /// </returns>
+    /// <remarks>
+    /// An unhandled exception is one that was not caught by application code and was instead
+    /// captured by the Sentry SDK through hooks like UnhandledExceptionHandler, ASP.NET Core
+    /// middleware, or other integration points. By default, Sentry marks exceptions as handled
+    /// unless explicitly captured through one of these unhandled exception hooks.
+    ///
+    /// This is useful for filtering events in callbacks like BeforeSend, where you may want to
+    /// treat unhandled exceptions differently from handled ones (e.g., always send unhandled
+    /// exceptions even if they match a filter that would normally exclude them).
+    /// </remarks>
+    /// <example>
+    /// <code>
+    /// options.SetBeforeSend((@event, hint) =>
+    /// {
+    ///     // Always send unhandled exceptions, even if they're network timeouts
+    ///     if (@event.IsFromUnhandledException())
+    ///     {
+    ///         return @event;
+    ///     }
+    ///
+    ///     // Filter out handled network timeout exceptions
+    ///     if (@event.Exception is HttpRequestException)
+    ///     {
+    ///         return null;
+    ///     }
+    ///
+    ///     return @event;
+    /// });
+    /// </code>
+    /// </example>
+    public static bool IsFromUnhandledException(this SentryEvent @event)
+        => @event.HasUnhandledException();
+
+    /// <summary>
+    /// Determines whether this event was created from a terminal exception.
+    /// </summary>
+    /// <param name="event">The Sentry event.</param>
+    /// <returns>
+    /// <c>true</c> if the event was created from a terminal exception; otherwise, <c>false</c>.
+    /// </returns>
+    /// <remarks>
+    /// A terminal exception is an unhandled exception that caused the application to crash or
+    /// terminate. This excludes unhandled exceptions that were explicitly marked as non-terminal,
+    /// such as those captured by UnobservedTaskException handlers or certain Unity SDK integrations.
+    ///
+    /// In most cases, an unhandled exception is terminal. However, some integrations may capture
+    /// unhandled exceptions that don't actually crash the app (e.g., unobserved task exceptions)
+    /// and mark them with Terminal = false.
+    /// </remarks>
+    /// <example>
+    /// <code>
+    /// options.SetBeforeSend((@event, hint) =>
+    /// {
+    ///     // Only send terminal exceptions for certain exception types
+    ///     if (@event.Exception is NetworkException &amp;&amp; !@event.IsFromTerminalException())
+    ///     {
+    ///         return null; // Don't send non-terminal network exceptions
+    ///     }
+    ///
+    ///     return @event;
+    /// });
+    /// </code>
+    /// </example>
+    public static bool IsFromTerminalException(this SentryEvent @event)
+        => @event.HasUnhandledTerminalException();
+}

test/Sentry.Tests/ApiApprovalTests.Run.DotNet10_0.verified.txt

@@ -552,6 +552,11 @@ namespace Sentry
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
         public static Sentry.SentryEvent FromJson(System.Text.Json.JsonElement json) { }
     }
+    public static class SentryEventExtensions
+    {
+        public static bool IsFromTerminalException(this Sentry.SentryEvent @event) { }
+        public static bool IsFromUnhandledException(this Sentry.SentryEvent @event) { }
+    }
     public sealed class SentryFeedback : Sentry.ISentryJsonSerializable
     {
         public SentryFeedback(string message, string? contactEmail = null, string? name = null, string? replayId = null, string? url = null, Sentry.SentryId? associatedEventId = default) { }

test/Sentry.Tests/ApiApprovalTests.Run.DotNet8_0.verified.txt

@@ -552,6 +552,11 @@ namespace Sentry
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
         public static Sentry.SentryEvent FromJson(System.Text.Json.JsonElement json) { }
     }
+    public static class SentryEventExtensions
+    {
+        public static bool IsFromTerminalException(this Sentry.SentryEvent @event) { }
+        public static bool IsFromUnhandledException(this Sentry.SentryEvent @event) { }
+    }
     public sealed class SentryFeedback : Sentry.ISentryJsonSerializable
     {
         public SentryFeedback(string message, string? contactEmail = null, string? name = null, string? replayId = null, string? url = null, Sentry.SentryId? associatedEventId = default) { }

test/Sentry.Tests/ApiApprovalTests.Run.DotNet9_0.verified.txt

@@ -552,6 +552,11 @@ namespace Sentry
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
         public static Sentry.SentryEvent FromJson(System.Text.Json.JsonElement json) { }
     }
+    public static class SentryEventExtensions
+    {
+        public static bool IsFromTerminalException(this Sentry.SentryEvent @event) { }
+        public static bool IsFromUnhandledException(this Sentry.SentryEvent @event) { }
+    }
     public sealed class SentryFeedback : Sentry.ISentryJsonSerializable
     {
         public SentryFeedback(string message, string? contactEmail = null, string? name = null, string? replayId = null, string? url = null, Sentry.SentryId? associatedEventId = default) { }

test/Sentry.Tests/ApiApprovalTests.Run.Net4_8.verified.txt

@@ -540,6 +540,11 @@ namespace Sentry
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
         public static Sentry.SentryEvent FromJson(System.Text.Json.JsonElement json) { }
     }
+    public static class SentryEventExtensions
+    {
+        public static bool IsFromTerminalException(this Sentry.SentryEvent @event) { }
+        public static bool IsFromUnhandledException(this Sentry.SentryEvent @event) { }
+    }
     public sealed class SentryFeedback : Sentry.ISentryJsonSerializable
     {
         public SentryFeedback(string message, string? contactEmail = null, string? name = null, string? replayId = null, string? url = null, Sentry.SentryId? associatedEventId = default) { }