How to get all projectReferences of .NET 8.0 project as an array in Startup.cs

Question

I have an ASP.NET backend project that includes several small class library projects as references.

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
    <DockerComposeProjectPath>..\docker-compose.dcproj</DockerComposeProjectPath>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\src\Background\Publisher\Publisher.csproj" />
    <ProjectReference Include="..\src\Common\Common.csproj" />
    <ProjectReference Include="..\src\Data\Data.csproj" />
    <ProjectReference Include="..\src\Identity\Identity.csproj" />
    <ProjectReference Include="..\src\Transaction\Transaction.csproj" />
  </ItemGroup>

</Project>

I plan to register all services defined in these class libraries using assembly in the ConfigureServices method:

public static void ConfigureServices(this IServiceCollection services)
{
    // TODO: Get all project references as an array to optimize below code.
    var serviceTypes = Assembly.GetExecutingAssembly().GetTypes();
    var idTypes = Assembly.Load("Identity").GetTypes();
    var txTypes = Assembly.Load("Transaction").GetTypes();

    serviceTypes = serviceTypes.Concat(idTypes).Concat(txTypes).ToArray()
                   .Where(t => typeof(IService).IsAssignableFrom(t)
                               && !t.IsInterface && !t.IsAbstract)
                   .ToArray();

    foreach (var serviceType in serviceTypes)
    {
        var interfaceType = serviceType.GetInterfaces()
                                       .FirstOrDefault(i => typeof(IService).IsAssignableFrom(i));

        if (interfaceType != null)
        {
             services.AddScoped(interfaceType, serviceType);
        }
    }
}

Here are some sample services I am working with.

// Common library
public interface IService
{
}

// Identity library
public interface IUserService : IService 
{
}

public class UserService : IUserService 
{
}

// Transaction library
public interface ITransactionService : IService 
{
}

public class TransactionService : ITransactionService 
{
}

Is it possible to retrieve all the referenced library projects as an array within the ConfigureServices method of Startup?

This may help stackoverflow.com/questions/44708168/…

Christoph Lütjen
– Christoph Lütjen

2024-11-08 17:45:33 +00:00
Commented Nov 8, 2024 at 17:45 — Christoph Lütjen
– Christoph Lütjen, Commented Nov 8, 2024 at 17:45

Brando Zhang · Accepted Answer · 2024-11-11 03:37:07Z

You could use Assembly.GetExecutingAssembly(); to get current assembly and then query the loaded assembly with the IService interface and add them into the scoped service.

More details, you could refer to below example:

var currentAssembly = Assembly.GetExecutingAssembly();
 
 var referencedAssemblies = currentAssembly.GetReferencedAssemblies()
                                          .Select(Assembly.Load)
                                          .ToList();

 referencedAssemblies.Add(currentAssembly);

 var serviceTypes = referencedAssemblies
    .SelectMany(assembly => assembly.GetTypes())
    .Where(type => typeof(IService).IsAssignableFrom(type) &&
                   !type.IsInterface &&
                   !type.IsAbstract)
    .ToList();

foreach (var serviceType in serviceTypes)
{
    var interfaceType = serviceType.GetInterfaces()
        .FirstOrDefault(i => typeof(IService).IsAssignableFrom(i));

    if (interfaceType != null)
    {
        builder.Services.AddScoped(interfaceType, serviceType);
    }
}

Result:

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