asp.net core 实现一个简单的仓储的方法

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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