#related to issue
I have following interfaces (located in nuget package, but in reproduction it is alongside other projects in single solution)
public interface IUnitOfWork
{
Task<int> SaveAsync(CancellationToken cancellationToken = default (CancellationToken));
}
public interface IRepository<TAggregate, TKey> where TAggregate : class, IAggregateRoot<TKey>
{
IUnitOfWork UnitOfWork { get; }
}
public interface IEfRepository<TAggregate, TKey> : IRepository<TAggregate, TKey>
where TAggregate : class, IAggregateRoot<TKey>
{
Task SomeMethod(CancellationToken token = default);
}
public interface IAggregateRoot<TKey>
{
TKey Id { get; set; }
}csproj of a nuget package looks like that:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.1</TargetFramework>
<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
<Version>2.0.0</Version>
<AssemblyVersion>2.0.0</AssemblyVersion>
<DebugType>Full</DebugType>
<Nullable>enable</Nullable>
<LangVersion>8</LangVersion>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<DebugType>Full</DebugType>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.0" />
</ItemGroup>
</Project>and in my Infrastructure project (which is referenced by Service project) I have following interface and implementation:
public interface IDocumentRepository : IEfRepository<Document, int>
{
}
public class DocumentRepository : Repository<Document, int>, IDocumentRepository
{
public DocumentRepository(
WriteDocumentsContext writeDocumentsContext
)
: base(writeDocumentsContext)
{
}
public IUnitOfWork UnitOfWork { get; }
public Task SomeMethod(CancellationToken token = default)
{
return Task.CompletedTask;
}
}
public class Document : IAggregateRoot<int>
{
public int Id { get; set; }
}
public class Repository<T, T1>
{
protected Repository(WriteDocumentsContext writeDocumentsContext)
{
}
}
public class WriteDocumentsContext : DbContext
{
}When I try to invoke UnitOfWork like that:
public class D
{
private readonly IDocumentRepository _documentsRepository;
public D(IDocumentRepository docRepo, IDocumentRepository documentsRepository)
{
_documentsRepository = documentsRepository;
}
public async Task SomeMethod(CancellationToken token = default)
{
await _documentsRepository.UnitOfWork.SaveAsync(token);
}
}and csproj of my Infrastructure project looks like that:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
<DebugType>Full</DebugType>
<IsPackable>false</IsPackable>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="MyNugetPackage" Version="2.0.0" />
</ItemGroup>
</Project>and csproj of my Service project looks like that:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
<DebugType>Full</DebugType>
<IsPackable>false</IsPackable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\Infrastructure\Infrastructure.csproj" />
</ItemGroup>
</Project>I get following error:
DeleteDocumentCommandHandler.cs(58, 48): [CS0229] Ambiguity between 'IRepository<Document, int>.UnitOfWork' and 'IRepository<Document, int>.UnitOfWork'
But when:
-
I move
DocumentRepositoryandIDocumentRepositoryfiles to the service project, everything works just fine. -
When I inject
IEfRepository<Document, int>instead ofIDocumentRepositoryalso everything works just fine. -
When I add generic constraints on
IDocumentRepositoryit still doesn't work. -
I add to the Infrastructure project csproj following lines
<Nullable>enable</Nullable> <LangVersion>8</LangVersion>
It works...
I'm using .net core 3.1 and try to compile project by dotnet build, in Rider IDE and Visual Studio 2019.
Side note:
When I remove the nullable = enable from a nuget package, also everything works just fine.
EF Core version: 3.1 Database provider: Microsoft.EntityFrameworkCore.SqlServer Target framework: NET Core 3.1 Operating system: Windows 10 Pro/Home IDE: dotnet console, Jetbrains Rider, Visual Studio 2019