Unity整合Asp.Net MVC

　　先来看一下我们的解决方案

　　我们建立Yubay.Models项目，

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Yubay.Models.Data
{
    public class YubayDbContext : DbContext
    {
        public YubayDbContext() : base("YubayConnection")
        {

        }

        public DbSet<Category> Category { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            Database.CreateIfNotExists();

            base.OnModelCreating(modelBuilder);
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Yubay.Models
{
    [Table("Category")]
    public partial class Category
    {
        public int Id { get; set; }

        [StringLength()]
        public string Code { get; set; }

        [StringLength()]
        public string ParentCode { get; set; }

        public int? CategoryLevel { get; set; }

        [StringLength()]
        public string Name { get; set; }

        [StringLength()]
        public string Url { get; set; }

        public int? State { get; set; }
    }
}

　　接着再建立Yubay.Service项目

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using Yubay.Core.Models;

namespace Yubay.Service
{
    public interface IBaseService : IDisposable
    {
        /// <summary>
        /// 根据id查询实体
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        T Find<T>(int id) where T : class;

        /// <summary>
        /// 提供对单表的查询，
        /// </summary>
        /// <returns>IQueryable类型集合</returns>
        IQueryable<T> Set<T>() where T : class;

        /// <summary>
        /// 查询
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="funcWhere"></param>
        /// <returns></returns>
        IQueryable<T> Query<T>(Expression<Func<T, bool>> funcWhere) where T : class;

        /// <summary>
        /// 分页查询
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="S"></typeparam>
        /// <param name="funcWhere"></param>
        /// <param name="pageSize"></param>
        /// <param name="pageIndex"></param>
        /// <param name="funcOrderby"></param>
        /// <param name="isAsc"></param>
        /// <returns></returns>
        PageResult<T> QueryPage<T, S>(Expression<Func<T, bool>> funcWhere, int pageSize, int pageIndex, Expression<Func<T, S>> funcOrderby, bool isAsc = true) where T : class;

        /// <summary>
        /// 新增数据，即时Commit
        /// </summary>
        /// <param name="t"></param>
        /// <returns>返回带主键的实体</returns>
        T Insert<T>(T t) where T : class;

        /// <summary>
        /// 新增数据，即时Commit
        /// 多条sql 一个连接，事务插入
        /// </summary>
        /// <param name="tList"></param>
        /// <returns>返回带主键的集合</returns>
        IEnumerable<T> Insert<T>(IEnumerable<T> tList) where T : class;

        /// <summary>
        /// 更新数据，即时Commit
        /// </summary>
        /// <param name="t"></param>
        void Update<T>(T t) where T : class;

        /// <summary>
        /// 更新数据，即时Commit
        /// </summary>
        /// <param name="tList"></param>
        void Update<T>(IEnumerable<T> tList) where T : class;

        /// <summary>
        /// 根据主键删除数据，即时Commit
        /// </summary>
        /// <param name="t"></param>
        void Delete<T>(int Id) where T : class;

        /// <summary>
        /// 删除数据，即时Commit
        /// </summary>
        /// <param name="t"></param>
        void Delete<T>(T t) where T : class;

        /// <summary>
        /// 删除数据，即时Commit
        /// </summary>
        /// <param name="tList"></param>
        void Delete<T>(IEnumerable<T> tList) where T : class;

        /// <summary>
        /// 立即保存全部修改
        /// </summary>
        void Commit();

        /// <summary>
        /// 执行sql 返回集合
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        IQueryable<T> ExcuteQuery<T>(string sql, SqlParameter[] parameters) where T : class;

        /// <summary>
        /// 执行sql，无返回
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parameters"></param>
        void Excute<T>(string sql, SqlParameter[] parameters) where T : class;
    }
}

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.SqlClient;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using Yubay.Core.Models;

namespace Yubay.Service
{

    public class BaseService : IBaseService
    {
        #region Identity
        protected DbContext Context { get; private set; }
        /// <summary>
        /// 构造函数注入
        /// </summary>
        /// <param name="context"></param>
        public BaseService(DbContext context)
        {
            this.Context = context;
        }
        #endregion Identity

        public T Insert<T>(T t) where T : class
        {
            this.Context.Set<T>().Add(t);
            this.Commit();
            return t;
        }

        public IEnumerable<T> Insert<T>(IEnumerable<T> tList) where T : class
        {
            this.Context.Set<T>().AddRange(tList);
            this.Commit();//一个链接  多个sql
            return tList;
        }

        #region Query
        public T Find<T>(int id) where T : class
        {
            return this.Context.Set<T>().Find(id);
        }

        /// <summary>
        /// 不应该暴露给上端使用者
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public IQueryable<T> Set<T>() where T : class
        {
            return this.Context.Set<T>();
        }
        /// <summary>
        /// 这才是合理的做法，上端给条件，这里查询
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="funcWhere"></param>
        /// <returns></returns>
        public IQueryable<T> Query<T>(Expression<Func<T, bool>> funcWhere) where T : class
        {
            return this.Context.Set<T>().Where<T>(funcWhere);
        }

        public PageResult<T> QueryPage<T, S>(Expression<Func<T, bool>> funcWhere, int pageSize, int pageIndex, Expression<Func<T, S>> funcOrderby, bool isAsc = true) where T : class
        {
            var list = this.Set<T>();
            if (funcWhere != null)
            {
                list = list.Where<T>(funcWhere);
            }
            if (isAsc)
            {
                list = list.OrderBy(funcOrderby);
            }
            else
            {
                list = list.OrderByDescending(funcOrderby);
            }
            PageResult<T> result = new PageResult<T>()
            {
                DataList = list.Skip((pageIndex - ) * pageSize).Take(pageSize).ToList(),
                PageIndex = pageIndex,
                PageSize = pageSize,
                TotalCount = this.Context.Set<T>().Count(funcWhere)
            };
            return result;
        }
        #endregion

        /// <summary>
        /// 是没有实现查询，直接更新的
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        public void Update<T>(T t) where T : class
        {
            if (t == null) throw new Exception("t is null");

            this.Context.Set<T>().Attach(t);//将数据附加到上下文，支持实体修改和新实体，重置为UnChanged
            this.Context.Entry<T>(t).State = EntityState.Modified;
            this.Commit();//保存 然后重置为UnChanged
        }

        public void Update<T>(IEnumerable<T> tList) where T : class
        {
            foreach (var t in tList)
            {
                this.Context.Set<T>().Attach(t);
                this.Context.Entry<T>(t).State = EntityState.Modified;
            }
            this.Commit();
        }

        /// <summary>
        /// 先附加 再删除
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        public void Delete<T>(T t) where T : class
        {
            if (t == null) throw new Exception("t is null");
            this.Context.Set<T>().Attach(t);
            this.Context.Set<T>().Remove(t);
            this.Commit();
        }

        /// <summary>
        /// 还可以增加非即时commit版本的，
        /// 做成protected
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="Id"></param>
        public void Delete<T>(int Id) where T : class
        {
            T t = this.Find<T>(Id);//也可以附加
            if (t == null) throw new Exception("t is null");
            this.Context.Set<T>().Remove(t);
            this.Commit();
        }

        public void Delete<T>(IEnumerable<T> tList) where T : class
        {
            foreach (var t in tList)
            {
                this.Context.Set<T>().Attach(t);
            }
            this.Context.Set<T>().RemoveRange(tList);
            this.Commit();
        }

        public void Commit()
        {
            this.Context.SaveChanges();
        }

        public IQueryable<T> ExcuteQuery<T>(string sql, SqlParameter[] parameters) where T : class
        {
            return this.Context.Database.SqlQuery<T>(sql, parameters).AsQueryable();
        }

        public void Excute<T>(string sql, SqlParameter[] parameters) where T : class
        {
            DbContextTransaction trans = null;
            try
            {
                trans = this.Context.Database.BeginTransaction();
                this.Context.Database.ExecuteSqlCommand(sql, parameters);
                trans.Commit();
            }
            catch (Exception ex)
            {
                if (trans != null)
                    trans.Rollback();
                throw ex;
            }
        }

        public virtual void Dispose()
        {
            if (this.Context != null)
            {
                this.Context.Dispose();
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Yubay.Models;

namespace Yubay.Service
{
    public interface ICategoryService : IBaseService
    {
        #region Query
        /// <summary>
        /// 用code获取当前类及其全部子孙类别的id
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        IEnumerable<int> GetDescendantsIdList(string code);

        /// <summary>
        /// 根据类别编码找子类别集合  找一级类用默认code  root
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        IEnumerable<Category> GetChildList(string code = "root");

        /// <summary>
        /// 查询并缓存全部的类别数据
        /// 类别数据一般是不变化的
        /// </summary>
        /// <returns></returns>
        List<Category> CacheAllCategory();
        #endregion Query
    }
}

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Yubay.Core.Caching;
using Yubay.Models;

namespace Yubay.Service
{
    public class CategoryService : BaseService, ICategoryService
    {
        #region Identity
        private DbSet<Category> _CategorySet = null;

        public CategoryService(DbContext dbContext)
            : base(dbContext)
        {
            this._CategorySet = base.Context.Set<Category>();
        }
        #endregion Identity

        #region Query
        /// <summary>
        /// 用code获取当前类及其全部子孙类别的id
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        public IEnumerable<int> GetDescendantsIdList(string code)
        {
            return this._CategorySet.Where(c => c.Code.StartsWith(code)).Select(c => c.Id);
        }

        /// <summary>
        /// 根据类别编码找子类别集合  找一级类用默认code  root
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        public IEnumerable<Category> GetChildList(string code = "root")
        {
            return this._CategorySet.Where(c => c.ParentCode.StartsWith(code));
        }

        /// <summary>
        /// 查询并缓存全部数据
        /// </summary>
        /// <returns></returns>
        public List<Category> CacheAllCategory()
        {
            return CacheManager.Get<List<Category>>("AllCategory", () => this._CategorySet.ToList());
        }
        #endregion Query
    }
}

　　接着再创建Yubay.Core项目，里面主要的两个类

using Microsoft.Practices.Unity.Configuration;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Unity;

namespace Yubay.Core.IOC
{
    /// <summary>
    /// 依赖注入工厂
    /// </summary>
    public class DIFactory
    {
        private static object _SyncHelper = new object();
        private static Dictionary<string, IUnityContainer> _UnityContainerDictionary = new Dictionary<string, IUnityContainer>();

        /// <summary>
        /// 根据containerName获取指定的container
        /// </summary>
        /// <param name="containerName">配置的containerName，默认为defaultContainer</param>
        /// <returns></returns>
        public static IUnityContainer GetContainer(string containerName = "unityContainer")
        {
            if (!_UnityContainerDictionary.ContainsKey(containerName))
            {
                lock (_SyncHelper)
                {
                    if (!_UnityContainerDictionary.ContainsKey(containerName))
                    {
                        //配置UnityContainer
                        IUnityContainer container = new UnityContainer();
                        ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
                        fileMap.ExeConfigFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "config\\unity.config");
                        Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
                        UnityConfigurationSection configSection = (UnityConfigurationSection)configuration.GetSection(UnityConfigurationSection.SectionName);
                        configSection.Configure(container, containerName);

                        _UnityContainerDictionary.Add(containerName, container);
                    }
                }
            }
            return _UnityContainerDictionary[containerName];
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Mvc;
using System.Web.Routing;
using Unity;

namespace Yubay.Core.IOC
{
    /// <summary>
    /// 自定义的控制器实例化工厂
    /// </summary>
    public class UnityControllerFactory : DefaultControllerFactory
    {
        private IUnityContainer UnityContainer
        {
            get
            {
                return DIFactory.GetContainer();
            }
        }

        /// <summary>
        /// 创建控制器对象
        /// </summary>
        /// <param name="requestContext"></param>
        /// <param name="controllerType"></param>
        /// <returns></returns>
        protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
        {
            if (null == controllerType)
            {
                return null;
            }
            IController controller = (IController)this.UnityContainer.Resolve(controllerType);
            return controller;
        }
        /// <summary>
        /// 释放
        /// </summary>
        /// <param name="controller"></param>
        public override void ReleaseController(IController controller)
        {
            //释放对象
            base.ReleaseController(controller);//
        }
    }
}

　　最后在MVC项目里面配置unity.config

<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Unity.Configuration"/>
  </configSections>
  <unity>
    <sectionExtension type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Unity.Interception.Configuration"/>
    <containers>
      <container name="unityContainer">
        <extension type="Interception"/>
        <register type="System.Data.Entity.DbContext, EntityFramework" mapTo="Yubay.Models.Data.YubayDbContext, Yubay.Models"/>
        <register type="Yubay.Service.IBaseService,Yubay.Service" mapTo="Yubay.Service.BaseService, Yubay.Service"/>
        <register type="Yubay.Service.ICategoryService,Yubay.Service" mapTo="Yubay.Service.CategoryService, Yubay.Service"/>
      </container>

      <container name="unityContainerGeneric">
        <register type="System.Data.Entity.DbContext, EntityFramework" mapTo="Yubay.Models.Data.YubayDbContext, Yubay.Models"/>
        <register type="Yubay.Service.IBaseService`1,Yubay.Service" mapTo="Yubay.Service.BaseService`1, Yubay.Service"/>
        <register type="Yubay.Service.ICategoryService,Ruanmou.Yubay.Service" mapTo="Yubay.Service.CategoryService, Yubay.Service"/>
      </container>
    </containers>
  </unity>
</configuration>

　　那么这时候如何把Unity整合到MVC呢？我们知道http请求管道中，激活Controller的时候有一个DefaultControllerFactory，我们可以通过重写它的方法来实现，在Application_Start中使用下面的语句替换掉默认的DefaultControllerFactory。

 ControllerBuilder.Current.SetControllerFactory(new UnityControllerFactory());//替换默认的控制器工厂

　　至此就将Unity整合到MVC中了。