can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
user
1. Immutable Object Pattern: The Customer class is designed to be immutable, meaning once an instance is created, its state cannot be changed directly. Instead, methods are provided to set properties, but these methods return a new instance with the updated state. For example, methods like `SetCustomerCode`, `UpdateBranchOfficeForCustomer`, `SetSpecificationJson`, `AddNewCustomerAddress`, and `DeleteCustomerAddress` all create a new instance with the updated state instead of modifying the existing instance.

2. Guard Clauses: The `Guard` class used in this code snippet is from the Ardalis.GuardClauses library, which is used to enforce invariants and prevent invalid state transitions. Guard clauses are a way to check the validity of method inputs and throw an exception if the input is invalid. This helps ensure that the methods receive only valid data, maintaining the class's integrity.

3. Domain Events: The base class `BaseEntityEv` in the `using uInvoiceDDD.SharedKernel;` namespace indicates that this Customer class might be using Domain Events. Domain events represent something that happened in the domain, and they allow the separation of concerns by decoupling the domain from the UI and infrastructure.

4. Repository Pattern: The `IAggregateRoot` interface in the code snippet suggests that the Customer class is used as an Aggregate Root, which is a part of the Domain-Driven Design pattern. An Aggregate Root is a cluster of domain objects that can be treated as a single unit for the purpose of data changes. The repository pattern is used to abstract the data access layer, providing a consistent interface for retrieving and updating domain objects.

5. Value Object Pattern: The CustomerAddress, CustomerEmailAddress, and other similar classes in the code snippet are likely to be implemented as value objects. Value objects represent a conceptual entity that does not have a separate identity. They are defined by their attributes and have no identity of their own. In this case, these classes have no unique identifiers and are added as a part of the Customer entity.

6. Factory Pattern: The private constructor with the `[SetsRequiredMembers]` attribute is used to set the initial state of the object. This constructor is not intended to be called directly but is used by the factory method or another constructor. This pattern ensures that the object is always in a valid state when created, which is important for maintaining the integrity of the class.

7. Dependency Injection: The Customer class uses dependencies like `BranchOffice`, `CustomerDocumentType`, and others. However, it does not create or manage these dependencies itself. Instead, it expects these dependencies to be provided from an external source, such as a dependency injection container. This promotes loose coupling and makes the code more testable and maintainable.

8. Read-only collections: The Customer class uses read-only collections (`IEnumerable`) for `CustomerAddresses`, `CustomerEmailAddresses`, `CustomerPhoneNumbers`, and `CustomerPriceLists`. This design ensures that the methods that return these collections cannot be modified, which makes the class more predictable and less prone to bugs.

9. Observer Pattern: The use of domain events (`ICoreEvent`) in the code snippet suggests that the Observer pattern might be used to notify other parts of the system when certain events occur. This pattern allows decoupling the objects that produce an event from the objects that handle the event, making the system more flexible and easier to maintain.
assistant
can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
user
1. **Domain-Driven Design (DDD)**: The `Customer` class is an example of an Entity in DDD. It encapsulates the state and behavior related to a Customer. The class implements the `IAggregateRoot` interface which is a marker interface indicating that this class is the root of an aggregate in DDD.

2. **Guard Clauses**: The `Guard` class used in the methods `SetCustomerCode`, `UpdateBranchOfficeForCustomer`, `AddNewCustomerAddress`, `DeleteCustomerAddress`, `AddNewCustomerEmailAddress`, and `DeleteCustomerEmailAddress` is from the Ardalis.GuardClauses library. It is a utility library for adding guard conditions to methods, which is a design pattern called "Guard Conditions" or "Preconditions" or "Exceptionless Exception". It helps to ensure that the method is called only with valid inputs, thus avoiding exceptions and maintaining the integrity of the data.

3. **Immutable Object Pattern**: The `Customer` class is designed to be immutable, which means once an instance of the class is created, its state cannot be modified. The only way to change the state is by creating a new instance with the updated state. This is evident in the methods like `SetCustomerCode`, `UpdateBranchOfficeForCustomer`, `AddNewCustomerAddress`, and `DeleteCustomerAddress` that do not modify the existing instance but instead create a new instance with the updated state.

4. **Repository Pattern**: The `IAggregateRoot` interface that the `Customer` class implements is often used in conjunction with the Repository pattern. Repositories are used to abstract the data access logic, allowing the business logic to remain independent of the underlying data access mechanism.

5. **Value Object Pattern**: The `CustomerAddress`, `CustomerEmailAddress`, and other similar classes that are used to represent the properties of a Customer (like `Address`, `EmailAddress`, etc.) but do not have an identity of their own, can be considered Value Objects. They are passed around as values, and their equality is based on their properties, not on their identity.

6. **Dependency Injection**: The `Customer` class does not have any explicit dependency injection, but it's a good practice to use Dependency Injection to provide the dependencies (like `BranchOffice` and `CustomerDocumentType`) to the `Customer` class. This can be achieved by using a constructor injection or property injection.

7. **Factory Pattern**: The constructor of the `Customer` class is marked with the `SetsRequiredMembers` attribute, which is a custom attribute that sets the properties with the same name as the constructor parameters. This can be considered as a simple factory pattern as the constructor is responsible for initializing the required properties of the class.

8. **Read-only Collections**: The `Customer` class uses read-only collections (`AsReadOnly`) for the properties `CustomerAddresses`, `CustomerEmailAddresses`, `CustomerPhoneNumbers`, and `CustomerPriceLists`. This ensures that the collections can only be read and not modified, maintaining the immutability of the class.

9. **List vs Array**: The use of `List<T>` instead of `T[]` for the private fields (`_customerAddresses`, `_customerEmailAddresses`, `_customerPhoneNumbers`, and `_customerPriceLists`) is a design decision. Lists provide more functionality than arrays, like the ability to add, remove, and manipulate elements. In this case, since the collections are read-only, the choice of List or Array might not matter much, but it's still a good practice to use a List when working with collections.

10. **Encapsulation**: The private setters for the properties like `CustomerCode`, `BranchOfficeId`, `CustomerDocumentTypeId`, and the private fields `_customerAddresses`, `_customerEmailAddresses`, `_customerPhoneNumbers`, and `_customerPriceLists` demonstrate the principle of encapsulation. The properties are exposed as read-only to the outside world, and the internal state is managed by the class itself. This ensures that the class maintains the integrity of its data.
assistant
can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
user
1. **Immutable Object Pattern**: The `Customer` class is designed as an immutable entity. Once properties are set, they cannot be changed. This is achieved by making all properties `private set` and providing methods to modify the state of the entity.

2. **Guard Clauses**: The `Guard` class used in this code is from the Ardalis.GuardClauses library. It is used to add guard conditions to methods to ensure the validity of the input data. This is a form of input validation and helps maintain the integrity of the object state.

3. **Domain Events**: The base class `BaseEntityEv` that the `Customer` class inherits from indicates the use of Domain Events. The `Customer` class raises events when its state changes. This decouples the logic of handling the state changes from the rest of the application.

4. **Repository Pattern**: The `IAggregateRoot` interface implemented by the `Customer` class suggests the use of Repository pattern. The repository acts as an intermediary between the `Customer` and the outside world, abstracting the data access details.

5. **Value Object Pattern**: The `CustomerAddress`, `CustomerEmailAddress`, and other related classes are likely to be implemented as value objects, as they don't have an identity and their equality is based on their properties' values.

6. **Factory Pattern**: The methods `AddNewCustomerAddress`, `AddNewCustomerEmailAddress`, and others, might be implementing a factory pattern to create new instances of related classes (CustomerAddress, CustomerEmailAddress, etc.) and add them to the parent entity (Customer).

7. **Specification Pattern**: The `SpecificationJson` property suggests the use of the Specification pattern, which separates the querying logic from the entity. In this case, it seems to be used to store some metadata or rules that can be queried later.

8. **Builder Pattern**: The constructor with multiple parameters, `Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)`, suggests the use of the Builder pattern. It allows the creation of complex objects step by step, making the code more readable and easier to maintain.

Overall, this `Customer` class is designed using several C# design patterns, including Immutable Object, Guard Clauses, Domain Events, Repository, Value Object, Factory, and Specification patterns, all of which are commonly used in Domain-Driven Design and Clean Architecture.
assistant
can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
user
1. **Guard Clauses**: The `Guard` class used in the code is from the `Ardalis.GuardClauses` library. This library is used to implement Guard Clauses design pattern. Guard Clauses are used to encapsulate preconditions that must be met before a method can be executed. It helps in enforcing business rules at the method level, which makes the code more robust and less prone to exceptions.
2. **Domain Events**: The `BaseEntityEv` base class is defined with the `IAggregateRoot` interface, which is a sign of Domain-driven Design (DDD) and Clean Architecture. The `IAggregateRoot` interface is used to mark a class as an Aggregate Root. An Aggregate Root is a cluster of domain objects that can be treated as a single unit for the purpose of data changes. The `Customer` class is an Aggregate Root, and it's handling domain events by implementing the `BaseEntityEv` base class.
3. **Immutable Object Pattern**: The `Customer` class is an immutable object, as most of its properties are set during the construction of the object and cannot be changed after that. This design pattern helps to ensure that the object's state remains consistent and that there are no unintended side-effects when the object is modified.
4. **Value Object Pattern**: The `CustomerAddress` and `CustomerEmailAddress` classes are examples of Value Objects. Value Objects are used to represent a concept that doesn't have an identity of its own. They are defined by their attributes, and their equality is based on their attributes.
5. **Repository Pattern**: The `IAggregateRoot` interface is used to interact with the database, and the `Customer` class is an implementation of this interface. This shows that the Repository Pattern is being used to abstract the data access logic from the rest of the application.
6. **Factory Pattern**: The `AddNewCustomerAddress` and `AddNewCustomerEmailAddress` methods are examples of the Factory Pattern. They are creating new instances of the `CustomerAddress` and `CustomerEmailAddress` classes, respectively, and adding them to the `Customer` instance. This helps to decouple the creation of objects from the rest of the application and makes the code more modular and easier to test.
7. **Lists**: The use of `List<T>` to store collections of related objects, such as `CustomerAddresses`, `CustomerEmailAddresses`, `CustomerPhoneNumbers`, `CustomerPriceLists`, and `Invoices`, shows that the code is using the Collection design pattern. This pattern is used to represent collections of objects and provides methods to add, remove, and manipulate the elements in the collection.
8. **Dependency Injection**: Although not explicitly shown in the code, the use of interfaces like `IAggregateRoot` and `BaseEntityEv` indicates that Dependency Injection (DI) is being used. DI is a design pattern that allows objects to be loosely coupled, as they depend on abstractions rather than concrete implementations. This makes the code more flexible and easier to test.
assistant
can you act as a C# expert, with lots of experience in C# Domain Driven Design , using C# Clean Architecture and in the following c# customer entity , explain which C# design patters are used and where 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Ardalis.GuardClauses;
using uInvoice.Core.Events;
using uInvoiceDDD.SharedKernel;
using uInvoiceDDD.SharedKernel.Interfaces;

namespace uInvoice.Core.Entities
{

 public class Customer : BaseEntityEv, IAggregateRoot
 {
 
 public Guid CustomerId { get; private set; }

 public string CustomerCode { get; private set; }

 public string CustomerDocument { get; private set; }

 
 public string FullName { get; private set; }

 public string? CommercialName { get; private set; }

 public bool IsActive { get; private set; }

 public string? SpecificationJson { get; private set; }

 public void SetCustomerCode(string customerCode)
 {
 CustomerCode = Guard.Against.NullOrEmpty(customerCode, nameof(customerCode));
 }

 public void UpdateBranchOfficeForCustomer(Guid newBranchOfficeId)
 {
 Guard.Against.NullOrEmpty(newBranchOfficeId, nameof(newBranchOfficeId));
 if (newBranchOfficeId == BranchOfficeId)
 {
 return;
 }

 BranchOfficeId = newBranchOfficeId;
 }
 

 public void SetSpecificationJson(string specificationJson)
 {
 SpecificationJson = specificationJson;
 }
 public virtual BranchOffice BranchOffice { get; private set; }

 public Guid BranchOfficeId { get; private set; }

 public virtual CustomerDocumentType CustomerDocumentType { get; private set; }

 public Guid CustomerDocumentTypeId { get; private set; }

 

 private readonly List \_customerAddresses = new();

 public IEnumerable CustomerAddresses => \_customerAddresses.AsReadOnly();
 private readonly List \_customerEmailAddresses = new();

 public IEnumerable CustomerEmailAddresses => \_customerEmailAddresses.AsReadOnly();
 private readonly List \_customerPhoneNumbers = new();

 public IEnumerable CustomerPhoneNumbers => \_customerPhoneNumbers.AsReadOnly();
 private readonly List \_customerPriceLists = new();

 public IEnumerable CustomerPriceLists => \_customerPriceLists.AsReadOnly();
 private readonly List \_invoices = new();

 public IEnumerable Invoices => \_invoices.AsReadOnly();
 public void AddNewCustomerAddress(Guid customerId, Guid addressId, Guid addressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 Guard.Against.NullOrEmpty(addressTypeId, nameof(addressTypeId));
 
 var newCustomerAddress = new CustomerAddress( customerId, addressId, addressTypeId);
 Guard.Against.DuplicateCustomerAddress(\_customerAddresses, newCustomerAddress, nameof(newCustomerAddress));
 \_customerAddresses.Add(newCustomerAddress);
 }

 public void DeleteCustomerAddress(Guid customerId, Guid addressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(addressId, nameof(addressId));
 
 var customerAddressToDelete = \_customerAddresses
 .Where(ca1 => ca1.CustomerId == customerId)
 .Where(ca2 => ca2.AddressId == addressId)
 .FirstOrDefault();
 
 if (customerAddressToDelete != null)
 {
 \_customerAddresses.Remove(customerAddressToDelete);
 }
 }

 public void AddNewCustomerEmailAddress(Guid customerId, Guid emailAddressId, Guid emailAddressTypeId)
 {
 
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 Guard.Against.NullOrEmpty(emailAddressTypeId, nameof(emailAddressTypeId));
 
 var newCustomerEmailAddress = new CustomerEmailAddress( customerId, emailAddressId, emailAddressTypeId);
 Guard.Against.DuplicateCustomerEmailAddress(\_customerEmailAddresses, newCustomerEmailAddress, nameof(newCustomerEmailAddress));
 \_customerEmailAddresses.Add(newCustomerEmailAddress);
 }

 public void DeleteCustomerEmailAddress(Guid customerId, Guid emailAddressId)
 {
 Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 Guard.Against.NullOrEmpty(emailAddressId, nameof(emailAddressId));
 
 var customerEmailAddressToDelete = \_customerEmailAddresses
 .Where(cea1 => cea1.CustomerId == customerId)
 .Where(cea2 => cea2.EmailAddressId == emailAddressId)
 .FirstOrDefault();
 
 if (customerEmailAddressToDelete != null)
 {
 \_customerEmailAddresses.Remove(customerEmailAddressToDelete);
 }
 }

 

 private Customer() {} // EF required

 [SetsRequiredMembers]
 public Customer(Guid customerId, Guid branchOfficeId, Guid customerDocumentTypeId, Guid economicActivityId, Guid paymentMethodId, Guid personTypeId, string customerCode, string customerDocument, string nrc, string fullName, string? commercialName, bool isActive, string? specificationJson)
 {
 
 CustomerId = Guard.Against.NullOrEmpty(customerId, nameof(customerId));
 BranchOfficeId = Guard.Against.NullOrEmpty(branchOfficeId, nameof(branchOfficeId));
 CustomerDocumentTypeId = Guard.Against.NullOrEmpty(customerDocumentTypeId, nameof(customerDocumentTypeId));
 EconomicActivityId = Guard.Against.NullOrEmpty(economicActivityId, nameof(economicActivityId));
 PaymentMethodId = Guard.Against.NullOrEmpty(paymentMethodId, nameof(paymentMethodId));
 PersonTypeId = Guard.Against.NullOrEmpty(personTypeId, nameof(personTypeId));
 CustomerCode = Guard.Against.NullOrWhiteSpace(customerCode, nameof(customerCode));
 CustomerDocument = Guard.Against.NullOrWhiteSpace(customerDocument, nameof(customerDocument));
 Nrc = Guard.Against.NullOrWhiteSpace(nrc, nameof(nrc));
 FullName = Guard.Against.NullOrWhiteSpace(fullName, nameof(fullName));
 CommercialName = commercialName;
 IsActive = Guard.Against.Null(isActive, nameof(isActive));
 SpecificationJson = specificationJson;

 }

 }
}
user
1. Immutable Object Pattern: The `Customer` class is designed as an immutable entity. All properties are set through methods with the `set` keyword preceded by the word `private`, making them inaccessible from outside the class. New values are assigned through methods, ensuring that the state of the object is not modified directly.

2. Guard Clauses: The `Guard` class is used to validate method arguments and throw exceptions if they are null, empty, or invalid. This is a way to enforce business rules and maintain the integrity of the object's state.

3. Data Annotations: The `[Required]` attribute from the `System.ComponentModel.DataAnnotations` namespace is used for validation. It ensures that the properties annotated with it are not null or empty when an instance of the `Customer` class is saved.

4. Repository Pattern: The `IAggregateRoot` interface is implemented by the `Customer` class, indicating that it is the root entity of an aggregate. This is a part of the repository pattern, which separates the data access logic from the business logic.

5. Factory Pattern: The private constructor (`private Customer() {}`) and the `[SetsRequiredMembers]` attribute indicate that the `Customer` class is being used as a factory. The factory pattern is used to create objects with a complex structure, providing a simpler interface for the client code. In this case, it ensures that all required properties are set when a new instance of the `Customer` class is created.

6. Value Object Pattern: The `CustomerAddress`, `CustomerEmailAddress`, and other classes that are added as properties to the `Customer` class could be considered value objects. Value objects represent a value that doesn't have an identity and are used to represent the properties of an entity that have no business logic associated with them.

7. Dependency Injection: Although not directly shown in the code, it seems that the `Customer` class is designed to be injected with dependencies like `BranchOffice` and `CustomerDocumentType`. This is a common practice in C#, which is called Dependency Injection. It helps to keep the classes loosely coupled and easier to test.
assistant