CSharp: Unit of Work Pattern in donet core 6

 

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuUnitOfWork.Domain {       /// <summary>     ///     /// </summary>     public abstract class Entity     {           /// <summary>         ///         /// </summary>         public int Id { get; init; }     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuUnitOfWork.Domain {       /// <summary>     /// 工作单元模式 Unit of Work Pattern     /// </summary>     public class Order : Entity     {           /// <summary>         ///         /// </summary>         public string Description { get; set; } = string.Empty;         /// <summary>         ///         /// </summary>         public string DeliveryAddress { get; set; } = string.Empty;         /// <summary>         ///         /// </summary>         public decimal Price { get; set; }     }   }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuUnitOfWork.Domain {       /// <summary>     /// 工作单元模式 Unit of Work Pattern     /// </summary>     public class Customer : Entity     {           /// <summary>         ///         /// </summary>         public string FirstName { get; set; } = string.Empty;         /// <summary>         ///         /// </summary>         public string LastName { get; set; } = string.Empty;     } }     using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Threading.Tasks; using Geovin.Du.DuUnitOfWork.Domain;         namespace Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories.Contracts {     public interface IRepositoryDu<T>         where T : Entity     {         T Add(T entity);           IEnumerable<T> GetAll();           IEnumerable<T> Get(Expression<Func<T, bool>> predicate);           T GetById(int id);           void Delete(T entity);     } }     using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Threading.Tasks; using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories.Contracts; using Geovin.Du.DuUnitOfWork.Domain;       namespace Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories {       /// <summary>     ///     /// </summary>     /// <typeparam name="T"></typeparam>     public class RepositoryDu<T> : IRepositoryDu<T>         where T : Entity     {         protected OrderManagementContextDu _context;           public RepositoryDu(OrderManagementContextDu context)         {             _context = context;         }           public virtual T Add(T entity) =>             _context                 .Add(entity)                 .Entity;           public virtual IEnumerable<T> GetAll() =>             _context.Set<T>().ToList();           public virtual IEnumerable<T> Get(Expression<Func<T, bool>> predicate) =>             _context.Set<T>()                 .AsQueryable()                 .Where(predicate)                 .ToList();           public virtual T GetById(int id)         {             var entity = _context.Find<T>(id);             return entity ?? throw new ArgumentException($"Entity with {id} doesn't exists");         }           public virtual void Delete(T entity) =>             _context.Remove(entity);     }   }     using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories.Contracts; using Geovin.Du.DuUnitOfWork.Domain; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuUnitOfWork.DuExample.Infrastructure {       /// <summary>     ///     /// </summary>     public interface IUnitOfWorkDu     {         IRepositoryDu<Customer> CustomerRepository { get; }         IRepositoryDu<Order> OrderRepository { get; }           void SaveChanges();     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Microsoft.EntityFrameworkCore; using Geovin.Du.DuUnitOfWork.Domain;       namespace Geovin.Du.DuUnitOfWork.DuExample.Infrastructure {     public class OrderManagementContextDu : DbContext     {         public DbSet<Customer> Customers => Set<Customer>();         public DbSet<Order> Orders => Set<Order>();           protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) =>             optionsBuilder.UseSqlite("Data Source=storage1.db");     } }     using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories; using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure.Repositories.Contracts; using Geovin.Du.DuUnitOfWork.Domain; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuUnitOfWork.DuExample.Infrastructure {         /// <summary>     ///     /// </summary>     public class UnitOfWorkDu : IUnitOfWorkDu     {         private readonly OrderManagementContextDu _context;         private IRepositoryDu<Customer>? _customerRepository;         private IRepositoryDu<Order>? _orderRepository;           public UnitOfWorkDu(OrderManagementContextDu context)         {             _context = context;         }           public IRepositoryDu<Customer> CustomerRepository         {             get             {                 if (_customerRepository == null)                 {                     _customerRepository = new RepositoryDu<Customer>(_context);                 }                   return _customerRepository;             }         }           public IRepositoryDu<Order> OrderRepository         {             get             {                 if (_orderRepository == null)                 {                     _orderRepository = new RepositoryDu<Order>(_context);                 }                   return _orderRepository;             }         }           public void SaveChanges() => _context.SaveChanges();     }   }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Geovin.Du.DuUnitOfWork.Domain; using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure;       namespace Geovin.Du.DuUnitOfWork.DuExample.Controllers {       /// <summary>     ///     /// </summary>     public class CustomerControllerDu     {         private readonly IUnitOfWorkDu _unitOfWork;           public CustomerControllerDu(IUnitOfWorkDu unitOfWork)         {             _unitOfWork = unitOfWork;         }           public IEnumerable<Customer> GetAll() => _unitOfWork.CustomerRepository.GetAll();     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Geovin.Du.DuUnitOfWork.Domain; using Geovin.Du.DuUnitOfWork.DuExample.Infrastructure;         namespace Geovin.Du.DuUnitOfWork.DuExample.Controllers {       /// <summary>     ///     /// </summary>     public class OrderControllerDu     {         private readonly IUnitOfWorkDu _unitOfWork;           public OrderControllerDu(IUnitOfWorkDu unitOfWork)         {             _unitOfWork = unitOfWork;         }           public Order Create(int id, string description, string deliveryAddress, decimal price)         {             // ID is usually auto-generated by database.             var newOrder = new Order             {                 Id = id,                 Description = description,                 DeliveryAddress = deliveryAddress,                 Price = price,             };               newOrder = _unitOfWork.OrderRepository.Add(newOrder);             // _unitOfWork.CustomerRepository.Add(new Customer() { Id = 33 });               // In this example we work only with order repository,             // but it would be possible to create/update different entities by using             // different repositories and save all changes via unit of work instance.             _unitOfWork.SaveChanges();               return newOrder;         }           public IEnumerable<Order> GetAll() => _unitOfWork.OrderRepository.GetAll();     }   }

　　

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/// <summary>     ///     /// </summary>     public static class DuExampleExecutor     {           /// <summary>         ///         /// </summary>         public static void Execute()         {             ConsoleExtension.WriteSeparator("工作单元模式 Unit of Work Pattern- demo");               InitializeDatabase();               using var context = new OrderManagementContextDu();             var unitOfWork = new UnitOfWorkDu(context);               var customerController = new CustomerControllerDu(unitOfWork);             var orderController = new OrderControllerDu(unitOfWork);               ShowAllCustomers();             ShowAllOrders();             CreateNewOrder();             ShowAllOrders();               void ShowAllCustomers()             {                 Console.WriteLine("显示所有客户...");                 foreach (var customer in customerController.GetAll())                 {                     Console.WriteLine($"{customer.FirstName} {customer.LastName}");                 }             }               void ShowAllOrders()             {                 Console.WriteLine("\n显示所有订单...");                 foreach (var order in orderController.GetAll())                 {                     Console.WriteLine($"{order.Description} 价格为： {order.Price:C}");                 }             }               void CreateNewOrder()             {                 Console.WriteLine("\n创建新订单...");                 orderController.Create(3, "游船 5", "北京 3", 9800);             }         }         /// <summary>         ///         /// </summary>         private static void InitializeDatabase()         {             using var context = new OrderManagementContextDu();             context.Database.EnsureDeleted();             context.Database.EnsureCreated();               var du = new Customer { Id = 1, FirstName = "Du", LastName = "Geovin" };             var tu = new Customer { Id = 2, FirstName = "Tu", LastName = "Juwen" };               var camera = new Order { Id = 1, Description = "摄像机", DeliveryAddress = "深圳 1", Price = 880 };             var phone = new Order { Id = 2, Description = "手机", DeliveryAddress = "上海 2", Price = 210 };               var unitOfWork = new UnitOfWorkDu(context);               unitOfWork.CustomerRepository.Add(du);             unitOfWork.CustomerRepository.Add(tu);             unitOfWork.OrderRepository.Add(camera);             unitOfWork.OrderRepository.Add(phone);               unitOfWork.SaveChanges();         }       } }

　　

调用：

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1	Geovin.Du.DuUnitOfWork.DuExample.DuExampleExecutor.Execute();

　　

输出：

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工作单元模式 Unit of Work Pattern- demo -------------------------------------------------- 显示所有客户... Du Geovin Tu Juwen   显示所有订单... 摄像机 价格为： ￥880.00 手机 价格为： ￥210.00   创建新订单...   显示所有订单... 摄像机 价格为： ￥880.00 手机 价格为： ￥210.00 游船 5 价格为： ￥9800.00