How to reduce duplication of domain/entity/DTO objects in C#?

How to reduce duplication of domain/entity/DTO objects in C#?

To reduce duplication of domain/entity/DTO objects in C#, you can use a design pattern called the "Adapter Pattern". The Adapter Pattern allows you to convert one object into another by creating a "wrapper" object that implements the same interface as the object being adapted.

Here's an example of how to use the Adapter Pattern to reduce duplication of domain/entity/DTO objects:

public class DomainObject { public int Id { get; set; } public string Name { get; set; } public DateTime Date { get; set; } } public interface IDto { int Id { get; set; } string Name { get; set; } DateTime Date { get; set; } } public class Dto : IDto { public int Id { get; set; } public string Name { get; set; } public DateTime Date { get; set; } } public interface IEntityAdapter<T> { T ToEntity(); } public class DomainObjectAdapter : IDto, IEntityAdapter<DomainObject> { private readonly DomainObject _domainObject; public DomainObjectAdapter(DomainObject domainObject) { _domainObject = domainObject; } public int Id { get { return _domainObject.Id; } set { _domainObject.Id = value; } } public string Name { get { return _domainObject.Name; } set { _domainObject.Name = value; } } public DateTime Date { get { return _domainObject.Date; } set { _domainObject.Date = value; } } public DomainObject ToEntity() { return _domainObject; } }

In this example, we define a DomainObject class that represents a domain entity, an IDto interface that defines a DTO object, and a Dto class that implements the IDto interface.

We then define an IEntityAdapter interface that defines a generic method for converting an adapted object to the original entity. We create a DomainObjectAdapter class that implements the IDto interface and the IEntityAdapter<DomainObject> interface, and takes a DomainObject object as a constructor parameter. The DomainObjectAdapter class acts as a "wrapper" object that converts the DomainObject to an IDto object by implementing the IDto interface and delegating property access to the underlying DomainObject. It also provides a method for converting the adapted object back to the original entity.

By using the Adapter Pattern, we can create a single set of domain/entity/DTO objects and adapt them as needed for different purposes, reducing duplication and improving code maintainability.

Examples

  1. "C# DRY principle for domain and DTO objects"

    • Code:
      // Domain Object public class Order { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... } // DTO Object public class OrderDTO { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... }
    • Description: Follows the DRY (Don't Repeat Yourself) principle by maintaining a single definition for properties shared between domain and DTO objects.

  2. "C# code reuse between entity and DTO"

    • Code:
      // CommonBase class for shared properties public class CommonBase { public int Id { get; set; } // Other shared properties... } // Domain Object public class Order : CommonBase { public string CustomerName { get; set; } // Other properties... } // DTO Object public class OrderDTO : CommonBase { public string CustomerName { get; set; } // Other properties... }
    • Description: Introduces a common base class to share properties among domain and DTO objects, promoting code reuse.

  3. "C# AutoMapper for domain and DTO object mapping"

    • Code:
      // Domain Object public class Order { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... } // DTO Object public class OrderDTO { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... } // AutoMapper Configuration CreateMap<Order, OrderDTO>();
    • Description: Utilizes AutoMapper for automatic mapping between domain and DTO objects, reducing the need for manual property assignment.

  4. "C# partial classes for shared properties in domain and DTO"

    • Code:
      // Domain Object (Part 1) public partial class Order { public int OrderId { get; set; } } // Domain Object (Part 2) public partial class Order { public string CustomerName { get; set; } // Other properties... } // DTO Object (Part 1) public partial class OrderDTO { public int OrderId { get; set; } } // DTO Object (Part 2) public partial class OrderDTO { public string CustomerName { get; set; } // Other properties... }
    • Description: Uses partial classes to separate shared properties and maintain a clean structure for both domain and DTO objects.

  5. "C# interfaces for common properties in domain and DTO"

    • Code:
      // Common Interface public interface IOrder { int OrderId { get; set; } string CustomerName { get; set; } // Other shared properties... } // Domain Object public class Order : IOrder { // Implement IOrder properties // Other properties specific to Order... } // DTO Object public class OrderDTO : IOrder { // Implement IOrder properties // Other properties specific to OrderDTO... }
    • Description: Defines a common interface for shared properties, allowing both domain and DTO objects to implement it.

  6. "C# code generation tools for reducing object duplication"

    • Code:
      // Generated by code generation tool public class Order { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... } // Generated by code generation tool public class OrderDTO { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... }
    • Description: Uses code generation tools (e.g., T4 templates, Roslyn) to automatically generate domain and DTO objects, reducing manual duplication.

  7. "C# extension methods for DTO conversion from domain objects"

    • Code:
      // Extension method public static class OrderExtensions { public static OrderDTO ToDTO(this Order order) { return new OrderDTO { OrderId = order.OrderId, CustomerName = order.CustomerName, // Map other properties... }; } }
    • Description: Defines extension methods to convert domain objects to DTO objects, encapsulating the mapping logic in a reusable manner.

  8. "C# value objects for shared properties in domain and DTO"

    • Code:
      // Value Object public class CustomerInfo { public int OrderId { get; set; } public string CustomerName { get; set; } // Other shared properties... } // Domain Object public class Order { public CustomerInfo CustomerInfo { get; set; } // Other properties... } // DTO Object public class OrderDTO { public CustomerInfo CustomerInfo { get; set; } // Other properties... }
    • Description: Introduces a value object (CustomerInfo) to encapsulate shared properties and embeds it within both domain and DTO objects.

  9. "C# object initialization expressions for reducing object duplication"

    • Code:
      // Domain Object public class Order { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... } // DTO Object with object initialization public class OrderDTO { public int OrderId { get; set; } public string CustomerName { get; set; } // Other properties... }
    • Description: Utilizes object initialization expressions to succinctly initialize properties, reducing duplication in both domain and DTO objects.

  10. "C# inheritance for common properties in domain and DTO"

    • Code:
      // Common Base class public class BaseEntity { public int OrderId { get; set; } public string CustomerName { get; set; } // Other shared properties... } // Domain Object public class Order : BaseEntity { // Other properties specific to Order... } // DTO Object public class OrderDTO : BaseEntity { // Other properties specific to OrderDTO... }
    • Description: Uses inheritance with a common base class (BaseEntity) to share properties between domain and DTO objects.

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