RSCG – Equatable.Generator

RSCG – Equatable.Generator
 
 

Generating Equals from properties

This is how you can use Equatable.Generator .

The code that you start with is

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Equatable.Generator" Version="2.0.0" />
  </ItemGroup>
</Project>

The code that you will use is

// See https://aka.ms/new-console-template for more information
using GeneratorEqualsDemo;
var p1 = new Person()
{
    ID = 1,
    FirstName = "Andrei",
    LastName = "Ignat"
};
var p2= new Person()
{
    ID = 2,
    FirstName = "aNdrei",
    LastName = "Ignat"
};
Console.WriteLine(p1==p2);

using Equatable.Attributes;

namespace GeneratorEqualsDemo;

[Equatable]
partial class Person
{
    [IgnoreEquality]
    public int ID { get; set; }
    [StringEquality(StringComparison.OrdinalIgnoreCase)]
    public string? FirstName { get; set; }
    [StringEquality(StringComparison.OrdinalIgnoreCase)]

    public string? LastName { get; set; }
}

The code that is generated is

// <auto-generated />
#nullable enable

namespace GeneratorEqualsDemo
{
    partial class Person : global::System.IEquatable<global::GeneratorEqualsDemo.Person?>
    {
        /// <inheritdoc />
        [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Equatable.SourceGenerator","2.0.0+10ad4b045a688eb10980afcd11ddb8e64505eda6")]
        public bool Equals(global::GeneratorEqualsDemo.Person? other)
        {
            return !(other is null)
                && global::System.StringComparer.OrdinalIgnoreCase.Equals(FirstName,other.FirstName)
                && global::System.StringComparer.OrdinalIgnoreCase.Equals(LastName,other.LastName);

        }

        /// <inheritdoc />
        [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Equatable.SourceGenerator","2.0.0+10ad4b045a688eb10980afcd11ddb8e64505eda6")]
        public override bool Equals(object? obj)
        {
            return Equals(obj as global::GeneratorEqualsDemo.Person);
        }

        /// <inheritdoc />
        [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Equatable.SourceGenerator","2.0.0+10ad4b045a688eb10980afcd11ddb8e64505eda6")]
        public static bool operator ==(global::GeneratorEqualsDemo.Person? left,global::GeneratorEqualsDemo.Person? right)
        {
            return global::System.Collections.Generic.EqualityComparer<global::GeneratorEqualsDemo.Person?>.Default.Equals(left,right);
        }

        /// <inheritdoc />
        [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Equatable.SourceGenerator","2.0.0+10ad4b045a688eb10980afcd11ddb8e64505eda6")]
        public static bool operator !=(global::GeneratorEqualsDemo.Person? left,global::GeneratorEqualsDemo.Person? right)
        {
            return !(left == right);
        }

        /// <inheritdoc />
        [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Equatable.SourceGenerator","2.0.0+10ad4b045a688eb10980afcd11ddb8e64505eda6")]
        public override int GetHashCode(){
            int hashCode = 1938039292;
            hashCode = (hashCode * -1521134295) + global::System.StringComparer.OrdinalIgnoreCase.GetHashCode(FirstName!);
            hashCode = (hashCode * -1521134295) + global::System.StringComparer.OrdinalIgnoreCase.GetHashCode(LastName!);
            return hashCode;

        }

    }
}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/Equatable.Generator