ASP.NETCore使用AutoFac依赖注入

 

实现代码

1、新建接口类：IRepository.cs，规范各个操作类的都有那些方法，方便管理。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

namespace CMS.Entity.Interfaces
{
    public  interface IRepository where T:class
    {
        /// 

        /// 添加
        /// 
        /// 实体对象
        void Add(T entity);
        /// 

        /// 更新
        /// 
        /// 实体对象
        void Update(T entity);
        /// 

        /// 删除
        /// 
        /// 实体对象
        void Delete(T entity);
        /// 

        /// 删除
        /// 
        /// 条件(lambda表达式)
        void Delete(Expressionbool>> where);
        /// 

        /// 根据ID获取一个对象
        /// 
        /// 主键ID
        /// 对象
        T GetById(long Id);
        /// 

        /// 根据ID获取一个对象
        /// 
        /// 主键ID
        /// 对象
        T GetById(string Id);
        /// 

        /// 根据条件获取一个对象
        /// 
        /// 条件(lambda表达式)
        /// 对象
        T Get(Expressionbool>> where);
        /// 

        /// 获取所有数据
        /// 
        /// 所有数据
        IQueryable GetAll();
        /// 

        /// 根据条件获取数据
        /// 
        /// 条件(lambda表达式)
        /// 数据
        IQueryable GetMany(Expressionbool>> where);
        /// 

        /// 根据条件获取记录数
        /// 
        /// 条件(lambda表达式)
        /// 
        int GetCount(Expressionbool>> where);
        /// 

        /// 关闭代理
        /// 
        void CloseProxy();
        /// 

        /// 打开代理
        /// 
        void OpenProxy();
        /// 

        /// 是否有指定条件的元素
        /// 
        /// 条件(lambda表达式)
        /// 
        bool IsHasValue(Expressionbool>> where);
    }
}

2、新建仓储基础操作类RepositoryBase.cs，注意要一一对应实现IRepositroy接口的方法

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;

namespace CMS.Entity.Interfaces
{
    public abstract class BaseRepository  where T: class
    {
        private BcmfDBContext db;//数据库上下文

        public BaseRepository(BcmfDBContext _db) {
            db = _db;
        }

        public virtual void Save()
        {
            db.SaveChanges();
        }

        public  virtual  void Add(T entity)
        {
            db.Set().Add(entity);
        }

        public virtual void CloseProxy()
        {
            db.Database.CommitTransaction();
        }

        public virtual void Delete(T entity)
        {
            db.Set().Remove(entity);
        }

        public virtual void Delete(System.Linq.Expressions.Expressionbool>> where)
        {
            var dataList = db.Set().Where(where).AsEnumerable();
            db.Set().RemoveRange(dataList);
        }

        public virtual T Get(System.Linq.Expressions.Expressionbool>> where)
        {
           return db.Set().FirstOrDefault(where);
        }

        public virtual System.Linq.IQueryable GetAll()
        {
            return db.Set();
        }

        public virtual T GetById(long Id)
        {
            return db.Set().Find(Id);
        }

        public virtual T GetById(string Id)
        {
            return db.Set().Find(Id);
        }

        public virtual int GetCount(System.Linq.Expressions.Expressionbool>> where)
        {
            return db.Set().Count(where);
        }

        public virtual System.Linq.IQueryable GetMany(System.Linq.Expressions.Expressionbool>> where)
        {
            return db.Set().Where(where);
        }

        public virtual bool IsHasValue(System.Linq.Expressions.Expressionbool>> where)
        {
            return db.Set().Any(where);
        }

        public virtual void OpenProxy()
        {
            db.Database.BeginTransaction();
        }

        public virtual void Update(T entity)
        {
            db.Set().Attach(entity);
            db.Entry(entity).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
        }
    }
}

3、新建仓储类TUserRepository与TOperateLogRepository，TUserRepository用于操作用户表，TOperateLogRepository用于操作用户记录表，对应的User类与OperateLog类根据项目需求自行创建

using System;
using System.Collections.Generic;
using System.Text;
using CMS.Entity.Repository;
using CMS.Entity.Entity;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using CMS.Entity.Interfaces;

namespace CMS.Entity.Repository
{
    public class TUserRepository :BaseRepository,IUserRepository
    {
        public TUserRepository(BcmfDBContext db) : base(db) { }
    }
    public interface IUserRepository : IRepository { }
}

using System;
using System.Collections.Generic;
using System.Text;
using CMS.Entity.Repository;
using CMS.Entity.Entity;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using CMS.Entity.Interfaces;

namespace CMS.Entity.Repository
{

    public class TOperateLogRepository : BaseRepository, IOperateLogRepository
    {
        public TOperateLogRepository(BcmfDBContext db) : base(db) { }
    }
    public interface IOperateLogRepository : IRepository
    {
    }
}

 

4、分别在UserController与OperateLogController控制器中的构造函数注入仓储类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using CMS.Entity;
using CMS.Entity.Entity;
using Newtonsoft.Json;
using CMS.WebApi.Core;
using Microsoft.EntityFrameworkCore.Query;
using CMS.Entity.Repository;

namespace CMS.WebApi.Controllers
{
    /// 

    /// 用户中心
    /// 
    //[Produces("application/json")]
    [Route("api/[controller]")]
    [ApiController]
    public class UsersController : ControllerBase
    {

        private readonly IUserRepository userRepository;
        public UsersController(IUserRepository _userRepository)
        {
            userRepository = _userRepository;
        }


        /// 

        /// 获取用户列表
        /// 
        /// 
        [HttpGet]
        public string Get()
        {
            var userList= userRepository.GetAll().ToList();
            return JsonConvert.SerializeObject(userList);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using CMS.Entity.Repository;
using Newtonsoft.Json;

namespace CMS.WebApi.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class OperateLogController : ControllerBase
    {
        private readonly IOperateLogRepository operateLogRepository;
        public OperateLogController(IOperateLogRepository _operateLogRepository)
        {
            operateLogRepository = _operateLogRepository;
        }

        [HttpGet]
        public string Get()
        {
            var result = operateLogRepository.GetMany(m=>m.ActionLogId<100);
            return JsonConvert.SerializeObject(result);
        }
    }
}

5、完成上述操作后，运行获取数据时会系统报错，那是由于还没将仓储类注入到服务中，接下来就实现用AutoFac注入仓储类到项目服务中

添加引用Autofac，Auto.Configuration，Autofac.Extensions.DependencyInjection到项目中

 

这里贴出Nuget程序控制台命令：

Install-Package Autofac -Version 4.9.2

Install-Package Autofac.Configuration -Version 4.1.0

Install-Package Autofac.Extensions.DependencyInjection -Version 4.4.0

6、打开项目Startup.cs，找到ConfigureServices方法，将void改为IServiceProvider返回值，如下

 //先引用命名空间
using Autofac;
using Autofac.Extensions.DependencyInjection;

public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            ...



            ////批量匹配注入，使用AutoFac提供的容器接管当前项目默认容器
            var builder = new ContainerBuilder();
            //注入entity层的repository类builder.RegisterType(typeof(TUserRepository)).As(typeof(IUserRepository)).InstancePerDependency();
            //批量注入Repository的类
       　　builder.RegisterAssemblyTypes(typeof(TUserRepository).Assembly)
                .Where(t => t.Name.EndsWith("Repository"))
                .AsImplementedInterfaces();
            builder.Populate(services);
            var container = builder.Build();
            //ConfigureServices方法由void改为返回IServiceProvider
            return new AutofacServiceProvider(container);
        }

7、重新生成发布项目，完成

 

转载于:https://www.cnblogs.com/luckypc/p/11002805.html