Builders

Sometimes you need builders for all types inherited from available at compile time at the point where the method is called.

using Shouldly;
using Pure.DI;

DI.Setup(nameof(Composition))
    .Bind().To(_ => Guid.NewGuid())
    .Bind().To<Dependency>()
    // Creates a builder for each type inherited from IService.
    // These types must be available at this point in the code.
    .Builders<IService>("BuildUp");

var composition = new Composition();
        
var service1 = composition.BuildUp(new Service1());
service1.Id.ShouldNotBe(Guid.Empty);
service1.Dependency.ShouldBeOfType<Dependency>();

var service2 = composition.BuildUp(new Service2());
service2.Id.ShouldBe(Guid.Empty);
service2.Dependency.ShouldBeOfType<Dependency>();

interface IDependency;

class Dependency : IDependency;

interface IService
{
    Guid Id { get; }

    IDependency? Dependency { get; }
}

record Service1: IService
{
    public Guid Id { get; private set; } = Guid.Empty;

    // The Dependency attribute specifies to perform an injection
    [Dependency]
    public IDependency? Dependency { get; set; }

    [Dependency]
    public void SetId(Guid id) => Id = id;
}

record Service2 : IService
{
    public Guid Id => Guid.Empty;

    [Dependency]
    public IDependency? Dependency { get; set; }
}

Running this code sample locally

Make sure you have the .NET SDK 9.0 or later is installed

dotnet --list-sdk

Create a net9.0 (or later) console application

dotnet new console -n Sample

Add references to NuGet packages
- Pure.DI
- Shouldly

dotnet add package Pure.DI
dotnet add package Shouldly

Copy the example code into the Program.cs file

You are ready to run the example 🚀

dotnet run

Important Notes:

The default builder method name is BuildUp
The first argument to the builder method is always the instance to be built

The following partial class will be generated:

partial class Composition
{
#if NET9_0_OR_GREATER
  private readonly Lock _lock;
#else
  private readonly Object _lock;
#endif

  [OrdinalAttribute(256)]
  public Composition()
  {
#if NET9_0_OR_GREATER
    _lock = new Lock();
#else
    _lock = new Object();
#endif
  }

  internal Composition(Composition parentScope)
  {
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public Service1 BuildUp(Service1 buildingInstance)
  {
    if (buildingInstance is null) throw new ArgumentNullException(nameof(buildingInstance));
    Service1 transService13;
    Service1 localBuildingInstance94 = buildingInstance;
    Guid transGuid6 = Guid.NewGuid();
    localBuildingInstance94.Dependency = new Dependency();
    localBuildingInstance94.SetId(transGuid6);
    transService13 = localBuildingInstance94;
    return transService13;
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public Service2 BuildUp(Service2 buildingInstance)
  {
    if (buildingInstance is null) throw new ArgumentNullException(nameof(buildingInstance));
    Service2 transService2;
    Service2 localBuildingInstance93 = buildingInstance;
    localBuildingInstance93.Dependency = new Dependency();
    transService2 = localBuildingInstance93;
    return transService2;
  }
}

Class diagram:

---
 config:
  maxTextSize: 2147483647
  maxEdges: 2147483647
  class:
   hideEmptyMembersBox: true
---
classDiagram
	Dependency --|> IDependency
	Composition ..> Service2 : Service2 BuildUp(Pure.DI.UsageTests.Basics.BuildersScenario.Service2 buildingInstance)
	Composition ..> Service1 : Service1 BuildUp(Pure.DI.UsageTests.Basics.BuildersScenario.Service1 buildingInstance)
	Service1 *--  Guid : Guid
	Service1 *--  Dependency : IDependency
	Service2 *--  Dependency : IDependency
	namespace Pure.DI.UsageTests.Basics.BuildersScenario {
		class Composition {
		<<partial>>
		+Service1 BuildUp(Pure.DI.UsageTests.Basics.BuildersScenario.Service1 buildingInstance)
		+Service2 BuildUp(Pure.DI.UsageTests.Basics.BuildersScenario.Service2 buildingInstance)
		}
		class Dependency {
				<<class>>
			+Dependency()
		}
		class IDependency {
			<<interface>>
		}
		class Service1 {
				<<record>>
			+IDependency Dependency
			+SetId(Guid id) : Void
		}
		class Service2 {
				<<record>>
			+IDependency Dependency
		}
	}
	namespace System {
		class Guid {
				<<struct>>
		}
	}

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