enumerable-generics.md

Enumerable generics

using Shouldly;
using Pure.DI;
using System.Collections.Immutable;

DI.Setup(nameof(Composition))
    .Bind<IDependency<TT>>().To<AbcDependency<TT>>()
    .Bind<IDependency<TT>>("Xyz").To<XyzDependency<TT>>()
    .Bind<IService<TT>>().To<Service<TT>>()

    // Composition roots
    .Root<IService<int>>("IntRoot")
    .Root<IService<string>>("StringRoot");

var composition = new Composition();

var intService = composition.IntRoot;
intService.Dependencies.Length.ShouldBe(2);
intService.Dependencies[0].ShouldBeOfType<AbcDependency<int>>();
intService.Dependencies[1].ShouldBeOfType<XyzDependency<int>>();

var stringService = composition.StringRoot;
stringService.Dependencies.Length.ShouldBe(2);
stringService.Dependencies[0].ShouldBeOfType<AbcDependency<string>>();
stringService.Dependencies[1].ShouldBeOfType<XyzDependency<string>>();

interface IDependency<T>;

class AbcDependency<T> : IDependency<T>;

class XyzDependency<T> : IDependency<T>;

interface IService<T>
{
    ImmutableArray<IDependency<T>> Dependencies { get; }
}

class Service<T>(IEnumerable<IDependency<T>> dependencies) : IService<T>
{
    public ImmutableArray<IDependency<T>> Dependencies { get; }
        = [..dependencies];
}

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

The following partial class will be generated:

partial class Composition
{
  private readonly Composition _root;

  [OrdinalAttribute(256)]
  public Composition()
  {
    _root = this;
  }

  internal Composition(Composition parentScope)
  {
    _root = (parentScope ?? throw new ArgumentNullException(nameof(parentScope)))._root;
  }

  public IService<string> StringRoot
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      [MethodImpl(MethodImplOptions.AggressiveInlining)]
      IEnumerable<IDependency<string>> EnumerationOf_perBlockIEnumerable1()
      {
        yield return new AbcDependency<string>();
        yield return new XyzDependency<string>();
      }

      IEnumerable<IDependency<string>> perBlockIEnumerable1 = EnumerationOf_perBlockIEnumerable1();
      return new Service<string>(perBlockIEnumerable1);
    }
  }

  public IService<int> IntRoot
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      [MethodImpl(MethodImplOptions.AggressiveInlining)]
      IEnumerable<IDependency<int>> EnumerationOf_perBlockIEnumerable1()
      {
        yield return new AbcDependency<int>();
        yield return new XyzDependency<int>();
      }

      IEnumerable<IDependency<int>> perBlockIEnumerable1 = EnumerationOf_perBlockIEnumerable1();
      return new Service<int>(perBlockIEnumerable1);
    }
  }
}

Class diagram:

---
 config:
  class:
   hideEmptyMembersBox: true
---
classDiagram
	ServiceᐸStringᐳ --|> IServiceᐸStringᐳ
	ServiceᐸInt32ᐳ --|> IServiceᐸInt32ᐳ
	AbcDependencyᐸStringᐳ --|> IDependencyᐸStringᐳ
	XyzDependencyᐸStringᐳ --|> IDependencyᐸStringᐳ : "Xyz" 
	AbcDependencyᐸInt32ᐳ --|> IDependencyᐸInt32ᐳ
	XyzDependencyᐸInt32ᐳ --|> IDependencyᐸInt32ᐳ : "Xyz" 
	Composition ..> ServiceᐸStringᐳ : IServiceᐸStringᐳ StringRoot
	Composition ..> ServiceᐸInt32ᐳ : IServiceᐸInt32ᐳ IntRoot
	ServiceᐸStringᐳ o-- "PerBlock" IEnumerableᐸIDependencyᐸStringᐳᐳ : IEnumerableᐸIDependencyᐸStringᐳᐳ
	ServiceᐸInt32ᐳ o-- "PerBlock" IEnumerableᐸIDependencyᐸInt32ᐳᐳ : IEnumerableᐸIDependencyᐸInt32ᐳᐳ
	IEnumerableᐸIDependencyᐸStringᐳᐳ *--  AbcDependencyᐸStringᐳ : IDependencyᐸStringᐳ
	IEnumerableᐸIDependencyᐸStringᐳᐳ *--  XyzDependencyᐸStringᐳ : "Xyz"  IDependencyᐸStringᐳ
	IEnumerableᐸIDependencyᐸInt32ᐳᐳ *--  AbcDependencyᐸInt32ᐳ : IDependencyᐸInt32ᐳ
	IEnumerableᐸIDependencyᐸInt32ᐳᐳ *--  XyzDependencyᐸInt32ᐳ : "Xyz"  IDependencyᐸInt32ᐳ
	namespace Pure.DI.UsageTests.BCL.EnumerableGenericsScenario {
		class AbcDependencyᐸInt32ᐳ {
			+AbcDependency()
		}
		class AbcDependencyᐸStringᐳ {
			+AbcDependency()
		}
		class Composition {
		<<partial>>
		+IServiceᐸInt32ᐳ IntRoot
		+IServiceᐸStringᐳ StringRoot
		}
		class IDependencyᐸInt32ᐳ {
			<<interface>>
		}
		class IDependencyᐸStringᐳ {
			<<interface>>
		}
		class IServiceᐸInt32ᐳ {
			<<interface>>
		}
		class IServiceᐸStringᐳ {
			<<interface>>
		}
		class ServiceᐸInt32ᐳ {
			+Service(IEnumerableᐸIDependencyᐸInt32ᐳᐳ dependencies)
		}
		class ServiceᐸStringᐳ {
			+Service(IEnumerableᐸIDependencyᐸStringᐳᐳ dependencies)
		}
		class XyzDependencyᐸInt32ᐳ {
			+XyzDependency()
		}
		class XyzDependencyᐸStringᐳ {
			+XyzDependency()
		}
	}
	namespace System.Collections.Generic {
		class IEnumerableᐸIDependencyᐸInt32ᐳᐳ {
				<<interface>>
		}
		class IEnumerableᐸIDependencyᐸStringᐳᐳ {
				<<interface>>
		}
	}

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