Initial files

This commit is contained in:
Samuele Lorefice
2025-09-21 06:58:04 +02:00
commit df9ad345ea
18 changed files with 795 additions and 0 deletions

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# Default ignored files
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/workspace.xml
# Rider ignored files
/.idea.QuickDI.iml
/contentModel.xml
/projectSettingsUpdater.xml
/modules.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="AgentMigrationStateService">
<option name="migrationStatus" value="COMPLETED" />
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="AskMigrationStateService">
<option name="migrationStatus" value="COMPLETED" />
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Ask2AgentMigrationStateService">
<option name="migrationStatus" value="COMPLETED" />
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="EditMigrationStateService">
<option name="migrationStatus" value="COMPLETED" />
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="UserContentModel">
<attachedFolders />
<explicitIncludes />
<explicitExcludes />
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\QuickDI\QuickDI.csproj" />
</ItemGroup>
</Project>

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using QuickDI;
namespace DISandbox;
interface IService {
public void Log(string message);
}
class Service : IService {
public void Log(string message) {
Console.WriteLine($"[Service] {message}");
}
}
interface IOtherService {
public Guid Id { get; }
public void ShowId() => Console.WriteLine($"[OtherService] ID: {Id}");
}
class GuidService : IOtherService {
public Guid Id { get; } = Guid.NewGuid();
}
class GuidDependantService(IService logService, IOtherService guidService) {
public void LogWithId(string message) {
logService.Log($"[GuidDependantService] {message} (ID: {guidService.Id})");
}
}
static class Program {
static void Main(string[] args) {
var container = new ServiceContainer()
.AddSingleton<IService, Service>()
.AddTransient<IOtherService, GuidService>()
.AddTransient<GuidDependantService, GuidDependantService>();
var service = container.GetService<IService>();
service.Log("Hello, Dependency Injection!");
container.GetService<IOtherService>().ShowId();
container.GetService<GuidDependantService>().LogWithId("Hello, sent from the dependency.");
container.GetService<IService>().Log("Goodbye, Dependency Injection!");
}
}

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Microsoft Visual Studio Solution File, Format Version 12.00
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuickDI", "QuickDI\QuickDI.csproj", "{4730ABA2-3979-4B74-A3FF-042F6C3C47D6}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DISandbox", "DISandbox\DISandbox.csproj", "{536F5490-926D-4B2A-8F07-9A7D1F8B9381}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{4730ABA2-3979-4B74-A3FF-042F6C3C47D6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{4730ABA2-3979-4B74-A3FF-042F6C3C47D6}.Debug|Any CPU.Build.0 = Debug|Any CPU
{4730ABA2-3979-4B74-A3FF-042F6C3C47D6}.Release|Any CPU.ActiveCfg = Release|Any CPU
{4730ABA2-3979-4B74-A3FF-042F6C3C47D6}.Release|Any CPU.Build.0 = Release|Any CPU
{536F5490-926D-4B2A-8F07-9A7D1F8B9381}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{536F5490-926D-4B2A-8F07-9A7D1F8B9381}.Debug|Any CPU.Build.0 = Debug|Any CPU
{536F5490-926D-4B2A-8F07-9A7D1F8B9381}.Release|Any CPU.ActiveCfg = Release|Any CPU
{536F5490-926D-4B2A-8F07-9A7D1F8B9381}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net9.0</TargetFramework>
<LangVersion>latest</LangVersion>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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using System.Reflection;
namespace QuickDI;
public class ServiceContainer {
private List<ServiceDescriptor> _descriptors = new();
private Dictionary<Type, object> _singletons = new();
/// <summary>
/// Get all registered implementation types for a given service type.
/// </summary>
/// <typeparam name="TServices"></typeparam>
/// <returns></returns>
public List<Type> GetServices<TServices>() =>
_descriptors.Where(d => d.ServiceType == typeof(TServices))
.Select(d => d.ImplementationType).ToList();
public ServiceContainer AddSingleton<TInterface, TImplementation>()
where TImplementation : class, TInterface {
_descriptors.Add(new ServiceDescriptor {
ServiceType = typeof(TInterface),
ImplementationType = typeof(TImplementation),
Lifetime = ServiceLifetime.Lifetime,
RequiredTypes = typeof(TImplementation).GetConstructors().Single()
.GetParameters().Select(p => p.ParameterType).ToList()
});
return this;
}
public ServiceContainer AddTransient<TInterface, TImplementation>()
where TImplementation : class, TInterface {
_descriptors.Add(new ServiceDescriptor {
ServiceType = typeof(TInterface),
ImplementationType = typeof(TImplementation),
Lifetime = ServiceLifetime.Transient,
RequiredTypes = typeof(TImplementation).GetConstructors().Single()
.GetParameters().Select(p => p.ParameterType).ToList()
});
return this;
}
// you can't call generic methods with an unknown type at compile time
// so we use reflection to call the generic GetService<T> method with the provided type
// Basically we build the method GetService<serviceType>() at runtime and then call it.
// "Classic black magic sorcery" in reflection.
private object GetService(Type serviceType) {
var method = typeof(ServiceContainer)
.GetMethod(nameof(GetService))!
.MakeGenericMethod(serviceType);
return method.Invoke(this, null)!;
}
public TInterface GetService<TInterface>() {
var descriptor = _descriptors.FirstOrDefault(d => d.ServiceType == typeof(TInterface));
if (descriptor == null) throw new Exception($"Service of type {typeof(TInterface)} not registered.");
// Ensure all required dependencies are registered
//TODO: some services might be asking for specific implementations, not interfaces. We should check for that too.
var missing = descriptor.RequiredTypes
//filter all required types that are not in the registered descriptors
.Where(t => _descriptors.All(d => d.ServiceType != t))
.Select(t => t.Name)
.ToList();
if (missing.Any())
throw new Exception($"Cannot create service of type {typeof(TInterface)}. Missing dependencies: {string.Join(", ", missing)}");
// Transient: create a new instance each time
if (descriptor.Lifetime != ServiceLifetime.Lifetime) {
var service = Instantiate<TInterface>(descriptor);
return service;
}
// Singleton: return existing instance
if (_singletons.TryGetValue(descriptor.ServiceType, out object? singleton)) return (TInterface)singleton;
// or create a new one if not yet created.
var newSingleton = Instantiate<TInterface>(descriptor);
_singletons[descriptor.ServiceType] = newSingleton!;
return newSingleton;
}
private TInterface Instantiate<TInterface>(ServiceDescriptor descriptor) {
var par = descriptor.ImplementationType
.GetConstructors().Single()
.GetParameters()
.Select(p => p.ParameterType)
.ToList();
object[] parameters = new object[par.Count];
for (int i = 0; i < par.Count; i++)
parameters[i] = GetService(par[i]);
var service = (TInterface?)Activator.CreateInstance(descriptor.ImplementationType, parameters);
return service ?? throw new Exception($"Could not create instance of type {descriptor.ImplementationType}");
}
}

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namespace QuickDI;
public class ServiceDescriptor {
public required Type ServiceType { get; set; }
public required Type ImplementationType { get; set; }
public required ServiceLifetime Lifetime { get; set; }
public List<Type> RequiredTypes { get; set; } = new();
}

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namespace QuickDI;
public enum ServiceLifetime {
Lifetime,
Transient
}

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# Quick DI
_Extremely tiny dependency injection C# library_

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{
"sdk": {
"version": "9.0.0",
"rollForward": "latestMinor",
"allowPrerelease": false
}
}