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Alder is a C# expression engine for .NET that parses, binds, validates, and executes C# expressions and statement blocks against CLR types, with support for async, Dynamic LINQ, expression-tree export, security controls, and NativeAOT.

14 starsC#

Alder: Dynamic Code Execution Without Roslyn

Name: Alder: Dynamic Code Execution Without Roslyn
Availability: InStock
Author: MartiSilvio

by MartiSilvio·May 18, 2026·1 point·0 comments

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AI Analysis

●●●BangerWizardryBig Brain

Full C# semantics with NativeAOT dispatch finally solves the Roslyn overhead problem.

Strengths

•Source generator emits reflection-free dispatch metadata specifically for NativeAOT scenarios.
•Implements ECMA-334 7th edition semantics including lambdas, iterators, and pattern matching.
•Zero third-party runtime dependencies while supporting both interpreted and compiled modes.

Weaknesses

•Niche appeal limited to developers specifically needing dynamic execution in AOT-constrained environments.
•Documentation depth for complex edge cases like custom operators may require reading source code.

Post Description

Hey HN, I recently published Alder and thought Id share it here.

I’ve been working with dynamic code execution for quite some time now and there still seems to be a lack of a open source solution that fully tackles this problem. A lot of the libraries I keep finding seem to be outdated or only support a small subset of C#. On the other hand, embedding Roslyn isn’t a viable solution for me due to the overhead it would introduce.

So I started building my own solution. Alder is an expression engine that parses, semantically binds, validates, and executes C# code dynamically in both interpreted and compiled modes, with support for AOT dispatch as well.

Although it started as a much smaller project, I’m quite surprised by how much of the language I ended up supporting in the end.

https://github.com/MartiSilvio/Alder

Any thoughts or feedback are really appreciated