control-generated-interfaces-by-members.md

July 3, 2026 · View on GitHub

Control generated interfaces by members

This example shows selective member inclusion and IgnoreInterface priority when generating interfaces.

using Shouldly;
using Pure.DI;

DI.Setup(nameof(Composition))
    .Bind().To<ProfileService>()
    .Root<App>(nameof(App));

var composition = new Composition();
var app = composition.App;

app.Summary.ShouldBe("42:Ada");

public partial interface IProfileReader;

public partial interface IProfileWriter;

public class ProfileService : IProfileReader, IProfileWriter
{
    [GenerateInterface(interfaceName: nameof(IProfileReader))]
    public int GetId() => 42;

    [GenerateInterface(interfaceName: nameof(IProfileWriter))]
    public void Rename(string name)
    {
    }

    [GenerateInterface(interfaceName: nameof(IProfileWriter))]
    [IgnoreInterface]
    public string Secret() => "hidden";

    [GenerateInterface(interfaceName: nameof(IProfileReader))]
    public string GetName() => "Ada";
}

public class App(IProfileReader reader)
{
    public string Summary { get; } = $"{reader.GetId()}:{reader.GetName()}";
}
Running this code sample locally 
dotnet --list-sdk
  • Create a net10.0 (or later) console application
dotnet new console -n Sample

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 example shows how to:

  • Generate interface members selectively
  • Keep class-level generation settings
  • Exclude explicitly ignored members from all generated interfaces
The following partial class will be generated 
partial class Composition
{
  public App App
  {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    get
    {
      return new App(new ProfileService());
    }
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>()
  {
    return Resolver<T>.Value.Resolve(this);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public T Resolve<T>(object? tag)
  {
    return Resolver<T>.Value.ResolveByTag(this, tag);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type)
  {
    #if NETCOREAPP3_0_OR_GREATER
    var index = (int)(_bucketSize * (((uint)type.TypeHandle.GetHashCode()) % 1));
    #else
    var index = (int)(_bucketSize * (((uint)RuntimeHelpers.GetHashCode(type)) % 1));
    #endif
    ref var pair = ref _buckets[index];
    return Object.ReferenceEquals(pair.Key, type) ? pair.Value.Resolve(this) : Resolve(type, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (Object.ReferenceEquals(pair.Key, type))
      {
        return pair.Value.Resolve(this);
      }
    }

    throw new CannotResolveException($"{CannotResolveMessage} {OfTypeMessage} {type}.", type, null);
  }

  [MethodImpl(MethodImplOptions.AggressiveInlining)]
  public object Resolve(Type type, object? tag)
  {
    #if NETCOREAPP3_0_OR_GREATER
    var index = (int)(_bucketSize * (((uint)type.TypeHandle.GetHashCode()) % 1));
    #else
    var index = (int)(_bucketSize * (((uint)RuntimeHelpers.GetHashCode(type)) % 1));
    #endif
    ref var pair = ref _buckets[index];
    return Object.ReferenceEquals(pair.Key, type) ? pair.Value.ResolveByTag(this, tag) : Resolve(type, tag, index);
  }

  [MethodImpl(MethodImplOptions.NoInlining)]
  private object Resolve(Type type, object? tag, int index)
  {
    var finish = index + _bucketSize;
    while (++index < finish)
    {
      ref var pair = ref _buckets[index];
      if (Object.ReferenceEquals(pair.Key, type))
      {
        return pair.Value.ResolveByTag(this, tag);
      }
    }

    throw new CannotResolveException($"{CannotResolveMessage} \"{tag}\" {OfTypeMessage} {type}.", type, tag);
  }

  private readonly static uint _bucketSize;
  private readonly static Pair<IResolver<Composition, object>>[] _buckets;

  static Composition()
  {
    var valResolver_0000 = new Resolver_0000();
    Resolver<App>.Value = valResolver_0000;
    _buckets = Buckets<IResolver<Composition, object>>.Create(
      1,
      out _bucketSize,
      new Pair<IResolver<Composition, object>>[1]
      {
         new Pair<IResolver<Composition, object>>(typeof(App), valResolver_0000)
      });
  }

  private const string CannotResolveMessage = "Cannot resolve composition root ";
  private const string OfTypeMessage = "of type ";

  private class Resolver<T>: IResolver<Composition, T>
  {
    public static IResolver<Composition, T> Value = new Resolver<T>();

    public virtual T Resolve(Composition composite)
    {
      throw new CannotResolveException($"{CannotResolveMessage}{OfTypeMessage}{typeof(T)}.", typeof(T), null);
    }

    public virtual T ResolveByTag(Composition composite, object tag)
    {
      throw new CannotResolveException($"{CannotResolveMessage}\"{tag}\" {OfTypeMessage}{typeof(T)}.", typeof(T), tag);
    }
  }

  private sealed class Resolver_0000: Resolver<App>
  {
    public override App Resolve(Composition composition)
    {
      return composition.App;
    }

    public override App ResolveByTag(Composition composition, object tag)
    {
      switch (tag)
      {
        case null:
          return composition.App;

        default:
          return base.ResolveByTag(composition, tag);
      }
    }
  }
}
The following partial class will be generated 
}
The following partial class will be generated 
}

Class diagram:

---
 config:
  class:
   hideEmptyMembersBox: true
---
classDiagram
	ProfileService --|> IProfileReader
	ProfileService --|> IProfileWriter
	Composition ..> App : App App
	App *-- ProfileService : IProfileReader
	namespace Pure.DI.UsageTests.Interfaces.GenerateInterfaceSelectiveMembersScenario {
		class App {
				<<class>>
			+App(IProfileReader reader)
		}
		class Composition {
		<<partial>>
		+App App
		+ T ResolveᐸTᐳ()
		+ T ResolveᐸTᐳ(object? tag)
		+ object Resolve(Type type)
		+ object Resolve(Type type, object? tag)
		}
		class IProfileReader {
			<<interface>>
		}
		class IProfileWriter {
			<<interface>>
		}
		class ProfileService {
				<<class>>
			+ProfileService()
		}
	}