RSCG – DependencyModules.SourceGenerator

RSCG – DependencyModules.SourceGenerator
 
 

Generating service dependencies from attributes.

Also,by the author,a more advanced example you will find in the DemoWithTest.zip inside the zip file

This is how you can use DependencyModules.SourceGenerator .

The code that you start with is

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>
	<ItemGroup>
	  <PackageReference Include="DependencyModules.Runtime" Version="1.0.0-RC9074" />
	  <PackageReference Include="DependencyModules.SourceGenerator" Version="1.0.0-RC9074" />
	 <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.2" />

	</ItemGroup>
</Project>

The code that you will use is

using DependencyModules.Runtime;
using InjectDemo;
using Microsoft.Extensions.DependencyInjection;


var serviceCollection = new ServiceCollection();

serviceCollection.AddModule<MyModule>();

var provider = serviceCollection.BuildServiceProvider();

var service = provider.GetService<Database>();

if(service == null)
    throw new Exception("Service not found");
else
    service.Open();

using DependencyModules.Runtime.Attributes;

[DependencyModule]
public partial class MyModule 
{ 

}

namespace InjectDemo
{
    internal interface IDatabase
    {
        public void Open();
    }
}

using DependencyModules.Runtime.Attributes;

namespace InjectDemo;
[SingletonService(ServiceType = typeof(Database))]
partial class Database : IDatabase
{
    private readonly IDatabase con;

    public Database(IDatabase con)
    {
        this.con = con;
    }
    public void Open()
    {
        Console.WriteLine($"open from database");
        con.Open();
    }

}

using DependencyModules.Runtime.Attributes;

namespace InjectDemo;
[SingletonService]
public partial class DatabaseCon:IDatabase
{
    public string? Connection { get; set; }
    public void Open()
    {
        Console.WriteLine("open from database con" );
    }
}

The code that is generated is

using DependencyModules.Runtime.Helpers;
using InjectDemo;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;

public partial class MyModule
{
    private static int moduleField = DependencyRegistry<MyModule>.Add(ModuleDependencies);

    private static void ModuleDependencies(IServiceCollection services)
    {
        services.AddSingleton(typeof(Database),typeof(Database));
        services.AddSingleton(typeof(IDatabase),typeof(DatabaseCon));
    }
}

using BaseAttribute = System.Attribute;
using DependencyModules.Runtime.Helpers;
using DependencyModules.Runtime.Interfaces;
using Microsoft.Extensions.DependencyInjection;

#nullable enable
public partial class MyModule : IDependencyModule
{

    static MyModule()
    {
    }

    public void PopulateServiceCollection(IServiceCollection services)
    {
        DependencyRegistry<MyModule>.LoadModules(services,this);
    }

    void IDependencyModule.InternalApplyServices(IServiceCollection services)
    {
        DependencyRegistry<MyModule>.ApplyServices(services);
    }

    public override bool Equals(object? obj)
    {
        return obj is MyModule;
    }

    public override int GetHashCode()
    {
        return HashCode.Combine(base.GetHashCode());
    }

    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Assembly | AttributeTargets.Method | AttributeTargets.Parameter,AllowMultiple = true)]
    public partial class Attribute : BaseAttribute,IDependencyModuleProvider
    {

        public IDependencyModule GetModule()
        {
            var newModule = new MyModule();
            return newModule;
        }
    }
}
#nullable disable

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/DependencyModules.SourceGenerator