ForgeMap

Compile-time object mapping for .NET — zero reflection, full type safety, MIT licensed.

ForgeMap is a Roslyn incremental source generator that writes your mapping code at compile time. The generated code is as fast as hand-written code, fully debuggable, and validated by the compiler.

Get Started

dotnet add package ForgeMap

[ForgeMap]
public partial class AppForger
{
    public partial OrderDto Forge(OrderEntity source);
}

Quick Start | API Reference | Migration from AutoMapper

Why ForgeMap?

Zero Reflection

All mapping code is generated at compile time. No System.Reflection, no Expression.Compile(), no runtime overhead.

Type Safe

Mappings are validated by the compiler and 45 dedicated diagnostics (FM0001-FM0045). Catch errors before your code runs.

Debuggable

Generated .g.cs files are readable C# — set breakpoints, step through mapping logic, inspect values.

Performance

ForgeMap is the fastest in benchmarks against AutoMapper and Mapperly (.NET 9, AMD EPYC 7763):

Scenario	ForgeMap	Mapperly	AutoMapper
Simple (10 props)	14.5 ns	15.9 ns (1.1x)	80.7 ns (5.6x)
Nested (2 levels)	27.3 ns	30.7 ns (1.1x)	92.5 ns (3.4x)
Deep (4 levels)	31.3 ns	35.8 ns (1.1x)	247.0 ns (7.9x)
Collection (1000)	17.7 us	20.1 us (1.1x)	22.2 us (1.3x)