RSCG – ServiceScan.SourceGenerator

RSCG – ServiceScan.SourceGenerator
 
 

name ServiceScan.SourceGenerator
nuget https://www.nuget.org/packages/ServiceScan.SourceGenerator/
link https://github.com/Dreamescaper/ServiceScan.SourceGenerator
author Oleksandr Liakhevych

Generating service collection / DI registration

 

This is how you can use ServiceScan.SourceGenerator .

The code that you start with is

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<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="ServiceScan.SourceGenerator" Version="1.1.2">
        <PrivateAssets>all</PrivateAssets>
        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      </PackageReference>
        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
    </ItemGroup>
</Project>

The code that you will use is

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using InjectDemo;
using Microsoft.Extensions.DependencyInjection;
var sc=new ServiceCollection();
sc.AddMyServices();
var sp=sc.BuildServiceProvider();
var con = sp.GetService(typeof(Database)) as IDatabase;
ArgumentNullException.ThrowIfNull(con);
con.Open();
 
 
 
public static partial class MyServiceProvider
{
    [ServiceScan.SourceGenerator.GenerateServiceRegistrations(AssignableTo = typeof(Database),AsSelf =true, Lifetime = ServiceLifetime.Scoped)]
 
    [ServiceScan.SourceGenerator.GenerateServiceRegistrations(AssignableTo = typeof(IDatabase), Lifetime = ServiceLifetime.Scoped)]
    public static partial IServiceCollection AddMyServices(this IServiceCollection services)
    ;
}
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namespace InjectDemo;
 
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();
    }
 
}
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namespace InjectDemo;
 
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

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#nullable enable
 
using System;
using System.Diagnostics;
using Microsoft.Extensions.DependencyInjection;
 
namespace ServiceScan.SourceGenerator;
 
[Conditional("CODE_ANALYSIS")]
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
internal class GenerateServiceRegistrationsAttribute : Attribute
{
    /// <summary>
    /// Set the assembly containing the given type as the source of types to register.
    /// If not specified, the assembly containing the method with this attribute will be used.
    /// </summary>
    public Type? FromAssemblyOf { get; set; }
 
    /// <summary>
    /// Set the type that the registered types must be assignable to.
    /// Types will be registered with this type as the service type,
    /// unless <see cref="AsImplementedInterfaces"/> or <see cref="AsSelf"/> is set.
    /// </summary>
    public Type? AssignableTo { get; set; }
 
    /// <summary>
    /// Set the lifetime of the registered services.
    /// <see cref="ServiceLifetime.Transient"/> is used if not specified.
    /// </summary>
    public ServiceLifetime Lifetime { get; set; }
 
    /// <summary>
    /// If set to true, types will be registered as implemented interfaces instead of their actual type.
    /// </summary>
    public bool AsImplementedInterfaces { get; set; }
 
    /// <summary>
    /// If set to true, types will be registered with their actual type.
    /// It can be combined with <see cref="AsImplementedInterfaces"/>, in that case implemeted interfaces will be
    /// "forwarded" to "self" implementation.
    /// </summary>
    public bool AsSelf { get; set; }
 
    /// <summary>
    /// Set this value to filter the types to register by their full name.
    /// You can use '*' wildcards.
    /// You can also use ',' to separate multiple filters.
    /// </summary>
    /// <example>Namespace.With.Services.*</example>
    /// <example>*Service,*Factory</example>
    public string? TypeNameFilter { get; set; }
}
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using Microsoft.Extensions.DependencyInjection;
 
 
 
public static partial class MyServiceProvider
{
    public static partial IServiceCollection AddMyServices(this IServiceCollection services)
    {
        return services
            .AddScoped<InjectDemo.Database, InjectDemo.Database>()
            .AddScoped<InjectDemo.IDatabase, InjectDemo.Database>()
            .AddScoped<InjectDemo.IDatabase, InjectDemo.DatabaseCon>();
    }
}

Code and pdf at

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