[聚合文章] asp.net core 实现一个简单的仓储

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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