Example of using restricted interface to hide Dispose method

Startup.cs

public class StartUp
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<IDoSomething, SomeDisposable>();
    }
}

public interface IDoSomething
{
    void DoSomething();
}

public class SomeDisposable : IDoSomething, IDisposable
{
    public void DoSomething()
    {
    }

    void IDisposable.Dispose()
    {
        // dispose unmanaged resources here
    }
}