DDD - Domain Service example

Entity.cs

public abstract class BaseEntity
{
    public int Id { get; set; }
}

public class ToDoEntity : BaseEntity
{
    public int Id { get; set; }
    
    /* some fields and properties*/
}

GetLastModifiedToDoItemsService.cs

public GetLastModifiedTodoItemResponse : IHandleResponse 
{ 
    ICollection<ToDoEntity> latestItems;
}

public GetLastModifiedTodoItemRequest : IHandleRequest 
{ 
    /* some search parameters, or something like that */
}

public class GetLastModifiedToDoItemsService : IHandle<IHandleRequest, IHandleResponse>
{
    public GetLastModifiedTodoItemResponse Handle(GetLastModifiedTodoItemRequest request)
    { 
        /*some code*/
        return response;
    }
}

IHandler.cs

public interface IHandlerRequest { }
public interface IHandlerResponse { }

public interface IHandle<T,G> where T:IHandlerRequest, G:IHandlerResponse 
{
    IHandlerResponse Handle(IHandlerRequest request);
}