ZeroAlloc.Specification.Generator 0.1.0

.NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 
dotnet add package ZeroAlloc.Specification.Generator --version 0.1.0
                    


                    

                
NuGet\Install-Package ZeroAlloc.Specification.Generator -Version 0.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="ZeroAlloc.Specification.Generator" Version="0.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="ZeroAlloc.Specification.Generator" Version="0.1.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="ZeroAlloc.Specification.Generator" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add ZeroAlloc.Specification.Generator --version 0.1.0
                    


                    

                
#r "nuget: ZeroAlloc.Specification.Generator, 0.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package ZeroAlloc.Specification.Generator@0.1.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=ZeroAlloc.Specification.Generator&version=0.1.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=ZeroAlloc.Specification.Generator&version=0.1.0
                    


                            Install as a Cake Tool

ZeroAlloc.Specification

Source-generated, zero-allocation specification pattern for .NET 8+.

NuGet NuGet Build License: MIT

Install

dotnet add package ZeroAlloc.Specification
dotnet add package ZeroAlloc.Specification.Generator

Example

[Specification]
public readonly partial struct ActiveUserSpec : ISpecification<User>
{
    public bool IsSatisfiedBy(User user) => user.IsActive;
    public Expression<Func<User, bool>> ToExpression() => u => u.IsActive;
}

[Specification]
public readonly partial struct PremiumUserSpec : ISpecification<User>
{
    private readonly decimal _minSpend;
    public PremiumUserSpec(decimal minSpend) => _minSpend = minSpend;

    public bool IsSatisfiedBy(User user) => user.TotalSpend >= _minSpend;
    public Expression<Func<User, bool>> ToExpression()
    {
        var min = _minSpend;
        return u => u.TotalSpend >= min;
    }
}

// Fluent composition — zero allocation
var spec = new ActiveUserSpec().And(new PremiumUserSpec(1000m));

// In-memory
bool result = spec.IsSatisfiedBy(user);

// EF Core — translates to SQL
var users = await dbContext.Users.Where(spec.ToExpression()).ToListAsync();

Features

  • Zero allocations — composed specs are readonly struct values, not heap objects
  • EF Core compatible — every spec exposes ToExpression() returning Expression<Func<T, bool>>
  • Source-generated fluent API — And<TOther>(), Or<TOther>(), Not() added by Roslyn generator
  • Static builder — Spec.And(), Spec.Or(), Spec.Not() for explicit type arguments
  • Compile-time safety — ZA001–ZA004 diagnostics enforce correct partial struct usage
  • .NET 8+, C# 12

Documentation

Page Description
Introduction What it is and why it exists
Getting Started Install and first specification in 5 minutes
Core Concepts ISpecification<T>, structs, stateful vs stateless
Fluent API Generated And/Or/Not methods
Static Builder Spec.And/Or/Not
Expression Composition ToExpression() and EF Core translation
Diagnostics ZA001–ZA004 compile-time errors and fixes
Generator Internals How the Roslyn generator works
Performance Allocation comparison and benchmarks
Cookbook: EF Core Repository Repository pattern integration
Cookbook: Combining Specs Complex compositions
Cookbook: Stateless Caching Cache expression trees for stateless specs

License

MIT — see LICENSE.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • .NETStandard 2.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
0.1.0 0 3/18/2026