sample Factory Pattern in C#, handling services with dependencies.

factory-with-dependencies.cs

public interface IDocumentProcessor { }

public class PdfProcessor : IDocumentProcessor {
    public PdfProcessor(PdfReader reader) { }
}

public class OdtProcessor : IDocumentProcessor {
    public OdtProcessor(OdtReader reader) { }
}

public class WordProcessor : IDocumentProcessor {
    public WordProcessor(WordReader reader) { }
}

public interface IDocumentProcessorFactory
{
    IDocumentProcessor Create(string type);
}

public class DocumentProcessorFactory : IDocumentProcessorFactory
{
    private readonly PdfReader _pdfReader;
    private readonly OdtReader _odtReader;
    private readonly WordReader _wordReader;

    public IDocumentProcessor Create(string type)
    {
        return type.ToLower() switch
        {
            "pdf" => new PdfProcessor(_pdfReader),
            "odt" => new OdtProcessor(_odtReader),
            "doc" => new WordProcessor(_wordReader),
            _ => throw new NotImplementedException(),
        };
    }
}