asp.net core 实现一个简单的仓储的方法

2024-07-10 13:32:45

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一直有自己写个框架的想法,但是一直没有行动起来,最近比较闲,正好可以开工了.

现在已经完成了两部分.1.一个简单仓储,实现使用的是ef 2.IOC部分,这里是把内置的ioc替换成了aotofac,这部分感觉还是有一点缺陷的.下面说

仓储部分

这里主要是接口是实现,目前使用ef实现了仓储的接口.看一下代码

 public interface IRepository<TEntity, TPrimaryKey>  where TEntity : class {  #region Select/Get/Query  IQueryable<TEntity> GetAll();  IQueryable<TEntity> GetAllIncluding(params Expression<Func<TEntity, object>>[] propertySelectors);  List<TEntity> GetAllList();  Task<List<TEntity>> GetAllListAsync();  List<TEntity> GetAllList(Expression<Func<TEntity, bool>> predicate);  Task<List<TEntity>> GetAllListAsync(Expression<Func<TEntity, bool>> predicate);  T Query<T>(Func<IQueryable<TEntity>, T> queryMethod);  TEntity Get(TPrimaryKey id);  Task<TEntity> GetAsync(TPrimaryKey id);  TEntity Single(Expression<Func<TEntity, bool>> predicate);  Task<TEntity> SingleAsync(Expression<Func<TEntity, bool>> predicate);  TEntity FirstOrDefault(TPrimaryKey id);  Task<TEntity> FirstOrDefaultAsync(TPrimaryKey id);  TEntity FirstOrDefault(Expression<Func<TEntity, bool>> predicate);  Task<TEntity> FirstOrDefaultAsync(Expression<Func<TEntity, bool>> predicate);  TEntity Load(TPrimaryKey id);  #endregion  #region Insert  TEntity Insert(TEntity entity);  Task<TEntity> InsertAsync(TEntity entity);  #endregion  #region Update  TEntity Update(TEntity entity);  Task<TEntity> UpdateAsync(TEntity entity);  TEntity Update(TPrimaryKey id, Action<TEntity> updateAction);  Task<TEntity> UpdateAsync(TPrimaryKey id, Func<TEntity, Task> updateAction);  #endregion  #region Delete  void Delete(TEntity entity);  Task DeleteAsync(TEntity entity);  void Delete(TPrimaryKey id);  Task DeleteAsync(TPrimaryKey id);  void Delete(Expression<Func<TEntity, bool>> predicate);  Task DeleteAsync(Expression<Func<TEntity, bool>> predicate);  #endregion  #region Aggregates  int Count();  Task<int> CountAsync();  int Count(Expression<Func<TEntity, bool>> predicate);  Task<int> CountAsync(Expression<Func<TEntity, bool>> predicate);  long LongCount();  Task<long> LongCountAsync();  long LongCount(Expression<Func<TEntity, bool>> predicate);  Task<long> LongCountAsync(Expression<Func<TEntity, bool>> predicate);  #endregion }

下面是实现的部分代码,代码比较占版面,就不贴全了.

 public abstract class RepositoryBase<TEntity, TPrimaryKey> : IRepository<TEntity, TPrimaryKey>  where TEntity : class {  public abstract IQueryable<TEntity> GetAll();  public abstract IQueryable<TEntity> GetAllIncluding(params Expression<Func<TEntity, object>>[] propertySelectors);  public virtual List<TEntity> GetAllList()  {   return GetAll().ToList();  }  public virtual async Task<List<TEntity>> GetAllListAsync()  {   return await Task.FromResult(GetAllList());  } }

 public class EfRepositoryBase<TDbContext, TEntity, TPrimaryKey> : RepositoryBase<TEntity, TPrimaryKey>  where TEntity : class  where TDbContext : DbContext {  public virtual TDbContext Context { private set; get; }  public virtual DbSet<TEntity> Table => Context.Set<TEntity>();  public EfRepositoryBase(TDbContext context)  {   Context = context;  }  public override IQueryable<TEntity> GetAll()  {   return Table;  }  public override IQueryable<TEntity> GetAllIncluding(params Expression<Func<TEntity, object>>[] propertySelectors)  {   if (propertySelectors == null)   {    return GetAll();   }   var linq = GetAll();   foreach (var item in propertySelectors)   {    linq = linq.Include(item);   }   return linq;  } }

注意看EfRepositoryBase继承了RepositoryBase,而RepositoryBase实现了IRepository.这里的RepositoryBase是所有实现的基类.GetAllList虚方法直接调用了抽象方法GetAll,这样在EfRepositoryBase中就可以减少很多代码了.

这里有个坑 EfRepositoryBase 是不能直接注册到IOC中的,因为EfRepositoryBase和IRepository的泛型参数个数不一致,ioc不能找到多出的一个泛型的值.使用仓储的时候继承EfRepositoryBase把dbcontext传进去就好了

public class TestRepository<TEntity, TPrimaryKey> : EfRepositoryBase<TestContext, TEntity, TPrimaryKey> where TEntity : class{ public TestRepository(TestContext context)  : base(context) { }}

IOC部分

asp.net core 微软提供了一个简单的IOC,但是接口比较少,替换成我们熟悉的ioc框架就方便多了. asp.net core 也有很方便的替换ioc的方法.简单说就是修改ConfigureServices方法的返回值为IServiceProvider.我使用了autofac,下面看代码.

public IServiceProvider ConfigureServices(IServiceCollection services){ services.AddMvc(); return services.AddLuna<AutofacModule>();}public static IServiceProvider AddLuna<TModule>([NotNull]this IServiceCollection services) where TModule : IModule, new(){ var builder = new ContainerBuilder(); builder.Populate(services); builder.RegisterModule<TModule>(); return new AutofacServiceProvider(builder.Build());}public class AutofacModule : Module{ protected override void Load(ContainerBuilder builder) {  builder.RegisterType<TestContext>();  builder.RegisterGeneric(typeof(TestRepository<,>)).As(typeof(IRepository<,>))   .InstancePerLifetimeScope(); }}

这里的Module和IModule是autofac的,功能已经实现了,但是作为框架来说直接暴露了autofac的东西显然是不合适的,下一步要实现一个框架自身的模块加载方式.

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