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<t> where t:class
    {
        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="entity">实体对象</param>
        void add(t entity);
        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="entity">实体对象</param>
        void update(t entity);
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="entity">实体对象</param>
        void delete(t entity);
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="where">条件(lambda表达式)</param>
        void delete(expression<func<t, bool>> where);
        /// <summary>
        /// 根据id获取一个对象
        /// </summary>
        /// <param name="id">主键id</param>
        /// <returns>对象</returns>
        t getbyid(long id);
        /// <summary>
        /// 根据id获取一个对象
        /// </summary>
        /// <param name="id">主键id</param>
        /// <returns>对象</returns>
        t getbyid(string id);
        /// <summary>
        /// 根据条件获取一个对象
        /// </summary>
        /// <param name="where">条件(lambda表达式)</param>
        /// <returns>对象</returns>
        t get(expression<func<t, bool>> where);
        /// <summary>
        /// 获取所有数据
        /// </summary>
        /// <returns>所有数据</returns>
        iqueryable<t> getall();
        /// <summary>
        /// 根据条件获取数据
        /// </summary>
        /// <param name="where">条件(lambda表达式)</param>
        /// <returns>数据</returns>
        iqueryable<t> getmany(expression<func<t, bool>> where);
        /// <summary>
        /// 根据条件获取记录数
        /// </summary>
        /// <param name="where">条件(lambda表达式)</param>
        /// <returns></returns>
        int getcount(expression<func<t, bool>> where);
        /// <summary>
        /// 关闭代理
        /// </summary>
        void closeproxy();
        /// <summary>
        /// 打开代理
        /// </summary>
        void openproxy();
        /// <summary>
        /// 是否有指定条件的元素
        /// </summary>
        /// <param name="where">条件(lambda表达式)</param>
        /// <returns></returns>
        bool ishasvalue(expression<func<t, bool>> 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<t>  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<t>().add(entity);
        }

        public virtual void closeproxy()
        {
            db.database.committransaction();
        }

        public virtual void delete(t entity)
        {
            db.set<t>().remove(entity);
        }

        public virtual void delete(system.linq.expressions.expression<func<t, bool>> where)
        {
            var datalist = db.set<t>().where(where).asenumerable();
            db.set<t>().removerange(datalist);
        }

        public virtual t get(system.linq.expressions.expression<func<t, bool>> where)
        {
           return db.set<t>().firstordefault(where);
        }

        public virtual system.linq.iqueryable<t> getall()
        {
            return db.set<t>();
        }

        public virtual t getbyid(long id)
        {
            return db.set<t>().find(id);
        }

        public virtual t getbyid(string id)
        {
            return db.set<t>().find(id);
        }

        public virtual int getcount(system.linq.expressions.expression<func<t, bool>> where)
        {
            return db.set<t>().count(where);
        }

        public virtual system.linq.iqueryable<t> getmany(system.linq.expressions.expression<func<t, bool>> where)
        {
            return db.set<t>().where(where);
        }

        public virtual bool ishasvalue(system.linq.expressions.expression<func<t, bool>> where)
        {
            return db.set<t>().any(where);
        }

        public virtual void openproxy()
        {
            db.database.begintransaction();
        }

        public virtual void update(t entity)
        {
            db.set<t>().attach(entity);
            db.entry<t>(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<user>,iuserrepository
    {
        public tuserrepository(bcmfdbcontext db) : base(db) { }
    }
    public interface iuserrepository : irepository<user> { }
}

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<operatelog>, ioperatelogrepository
    {
        public toperatelogrepository(bcmfdbcontext db) : base(db) { }
    }
    public interface ioperatelogrepository : irepository<operatelog>
    {
    }
}

 

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
{
    /// <summary>
    /// 用户中心
    /// </summary>
    //[produces("application/json")]
    [route("api/[controller]")]
    [apicontroller]
    public class userscontroller : controllerbase
    {

        private readonly iuserrepository userrepository;
        public userscontroller(iuserrepository _userrepository)
        {
            userrepository = _userrepository;
        }


        /// <summary>
        /// 获取用户列表
        /// </summary>
        /// <returns></returns>
        [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