MemberAccessor by Yamaokuno

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Details

Info

info

Name: MemberAccessor

Member accessor code generator.

Author: Yamaokuno

NuGet: https://www.nuget.org/packages/BunnyTail.MemberAccessor/

You can find more details at https://github.com/usausa/member-accessor-generator

Source: https://github.com/usausa/member-accessor-generator

Original Readme

note

BunnyTail.MemberAccessor

Reference

Add reference to BunnyTail.MemberAccessor to csproj.

 <ItemGroup>
 <PackageReference Include="BunnyTail.MemberAccessor" Version="1.2.0" />
 </ItemGroup>

MemberAccessor

Source

using BunnyTail.MemberAccessor;

[GenerateAccessor]
public partial class Data
{
 public int Id { get; set; }

 public string Name { get; set; } = default!;
}

using BunnyTail.MemberAccessor;

var accessorFactory = AccessorRegistry.FindFactory<Data>();
var getter = accessorFactory.CreateGetter<int>(nameof(Data.Id));
var setter = accessorFactory.CreateSetter<int>(nameof(Data.Id));

var data = new Data();
setter(data, 123);
var id = getter(data);

Benchmark

BenchmarkDotNet v0.14.0, Windows 11 (10.0.26100.2894)
AMD Ryzen 9 5900X, 1 CPU, 24 logical and 12 physical cores
.NET SDK 9.0.102
 [Host] : .NET 9.0.1 (9.0.124.61010), X64 RyuJIT AVX2
 DefaultJob : .NET 9.0.1 (9.0.124.61010), X64 RyuJIT AVX2

Method	Mean	Error	StdDev	Min	Max	P90	Code Size	Allocated
DirectGetter	0.2180 ns	0.0033 ns	0.0027 ns	0.2144 ns	0.2231 ns	0.2222 ns	10 B	-
ExpressionGetter	1.0868 ns	0.0143 ns	0.0134 ns	1.0737 ns	1.1127 ns	1.1095 ns	54 B	-
GeneratorGetter	0.2244 ns	0.0020 ns	0.0019 ns	0.2219 ns	0.2283 ns	0.2269 ns	72 B	-
DirectSetter	0.2155 ns	0.0009 ns	0.0008 ns	0.2138 ns	0.2167 ns	0.2165 ns	28 B	-
ExpressionSetter	1.0956 ns	0.0219 ns	0.0225 ns	1.0716 ns	1.1393 ns	1.1260 ns	57 B	-
GeneratorSetter	0.4306 ns	0.0014 ns	0.0012 ns	0.4284 ns	0.4328 ns	0.4323 ns	80 B	-

About

note

Generate getter and setter for class members.

How to use

Example (source csproj, source files)

CSharp Project
Program.cs
Person.cs

This is the CSharp Project that references MemberAccessor

<Project Sdk="Microsoft.NET.Sdk">

 <PropertyGroup>
 <OutputType>Exe</OutputType>
 <TargetFramework>net9.0</TargetFramework>
 <ImplicitUsings>enable</ImplicitUsings>
 <Nullable>enable</Nullable>
 </PropertyGroup>
<ItemGroup>
<PackageReference Include="BunnyTail.MemberAccessor" Version="1.2.0" />
</ItemGroup>
<PropertyGroup>
<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
</PropertyGroup>
</Project>

This is the use of MemberAccessor in Program.cs

using BunnyTail.MemberAccessor;
using DemoMember;

var accessorFactory = AccessorRegistry.FindFactory<Person>();
ArgumentNullException.ThrowIfNull(accessorFactory);
var getter = accessorFactory.CreateGetter<string>(nameof(Person.FirstName));
var setter = accessorFactory.CreateSetter<string>(nameof(Person.FirstName));
ArgumentNullException.ThrowIfNull(getter);
ArgumentNullException.ThrowIfNull(setter);
var p= new Person();
setter(p, "andrei");
Console.WriteLine(getter(p));

This is the use of MemberAccessor in Person.cs

using BunnyTail.MemberAccessor;

namespace DemoMember;
[GenerateAccessor]
internal class Person
{
 public string FirstName { get; set; }=string.Empty;
}

Generated Files

Those are taken from $(BaseIntermediateOutputPath)\GX

AccessorInitializer.g.cs
DemoMember_Person_Accessor.g.cs

// <auto-generated />
#nullable enable

internal static class AccessorFactoryInitializer
{
 [global::System.Runtime.CompilerServices.ModuleInitializer]
 public static void Initialize()
 {
 global::BunnyTail.MemberAccessor.AccessorRegistry.RegisterFactory(typeof(global::DemoMember.Person), typeof(global::DemoMember.Person_AccessorFactory));
 }
}

// <auto-generated />
#nullable enable

namespace DemoMember;

internal sealed class Person_AccessorFactory : global::BunnyTail.MemberAccessor.IAccessorFactory<global::DemoMember.Person>
{
 private static readonly global::System.Func<object, object?> ObjectFirstNameGetter = static x => ((global::DemoMember.Person)x).FirstName!;

 private static readonly global::System.Action<object, object?> ObjectFirstNameSetter = static (x, v) => ((global::DemoMember.Person)x).FirstName = (string)v!;

 private static readonly global::System.Func<global::DemoMember.Person, string> TypedFirstNameGetter = static x => x.FirstName;

 private static readonly global::System.Action<global::DemoMember.Person, string> TypedFirstNameSetter = static (x, v) => x.FirstName = v;

 public global::System.Func<object, object?>? CreateGetter(string name)
 {
 if (name == "FirstName") return ObjectFirstNameGetter;
 return null;
 }

 public global::System.Action<object, object?>? CreateSetter(string name)
 {
 if (name == "FirstName") return ObjectFirstNameSetter;
 return null;
 }

 public global::System.Func<global::DemoMember.Person, TProperty>? CreateGetter<TProperty>(string name)
 {
 if (name == "FirstName") return (global::System.Func<global::DemoMember.Person, TProperty>)(object)TypedFirstNameGetter;
 return null;
 }

 public global::System.Action<global::DemoMember.Person, TProperty>? CreateSetter<TProperty>(string name)
 {
 if (name == "FirstName") return (global::System.Action<global::DemoMember.Person, TProperty>)(object)TypedFirstNameSetter;
 return null;
 }
}