dadhi/FastExpressionCompiler

Health v2 · maintenance only

Adoption not part of the score

1374 stars · 94 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A .NET library that compiles C# expression trees to delegates far faster than the built-in LINQ compiler, with a lightweight LightExpression alternative and diagnostic/code-generation tools. It is widely used by DI containers, ORMs, and mappers for high-performance expression evaluation.

Use cases

• compile expression trees faster than Expression.Compile
• speed up dependency injection container resolution
• build an ORM that evaluates expressions quickly
• reduce memory allocations when compiling lambdas
• use a lighter expression tree implementation
• diagnose and generate code from expression trees

When to choose

• you compile many expression trees at runtime and compile time is a bottleneck
• you build a DI container, ORM, mapper, or serializer that relies on expression compilation
• you need a lightweight expression tree alternative with fast compilation

When to avoid

• you only compile a handful of expressions once at startup
• you are not on .NET or .NET Framework 4.7.2+
• you need full parity with every System.Linq.Expressions feature

Facets

library · maturity stable

compiler serialization developer-tools developer-tools performance programming-languages dotnet cross-platform expression-trees c-sharp delegates il-codegen lightexpression dryioc

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