orleans-result-pattern

To signal failure in Orleans grain calls without exceptions, use a Result pattern with enum-based ErrorNr and string messages. This approach provides version-tolerant serialization across grain boundaries using [Immutable] wrappers for zero-copy grain calls.

Yes, the Orleans result pattern supports version-tolerant serialization by using an enum-based error model and [Immutable] wrappers. This ensures clean zero-copy serialization across grain boundaries without breaking compatibility during contract updates.

To return RFC7807-compatible errors from ASP.NET Core endpoints over Orleans grains, annotate ErrorNr with a ValidationError flag. The result pattern integrates with minimal APIs and MVC endpoints to report validation failures predictably.

Yes, you can use this result pattern with Orleans 8+ grain contracts and ASP.NET Core minimal APIs. It provides Result and Result<T> wrappers that enable explicit success and error branch handling through switch expressions in client code.

Yes, you need Modern.CSharp.Templates to generate ErrorNr and Result types for Orleans grains. The Orleans result pattern requires these templates alongside Orleans 8+ to produce the immutable serialization-safe contract structures.

The best way to handle Orleans grain method failures without exceptions is using an enum-based Result pattern. Unlike throwing exceptions across grain boundaries, this pattern offers predictable failure flows, version-tolerant serialization, and explicit Result<T> semantics.