IOC

1.先定义一个数据接口和两个数据实现类

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5  6 namespace IDAL 7 { 8    public interface IStudent 9     {10        //读11        string Reading();12 13        //写14        string Writing();15 16     }17 }

 1 using IDAL; 2 using System; 3 using System.Collections.Generic; 4 using System.Linq; 5 using System.Text; 6  7 namespace MSDAL 8 { 9     public class Student : IStudent10     {11 12         public string Reading()13         {14             return "Reading , this is MSDAL";15         }16 17         public string Writing()18         {19             return "Writing , this is MSDAL";20         }21     }22 }

 1 using IDAL; 2 using System; 3 using System.Collections.Generic; 4 using System.Linq; 5 using System.Text; 6  7 namespace MySqlDAL 8 { 9     public class Student : IStudent10     {11         public string Reading()12         {13             return "Reading , this is MySqlDAL";14         }15 16         public string Writing()17         {18             return "Writing , this is MySqlDAL";19         }20     }21 }

2.实现客户端调用---直接调用

 1  class Program 2     { 3         static void Main(string[] args) 4         { 5             //1.紧耦合 要切换数据库改动很多 6              MSDAL.Student studentMS = new MSDAL.Student(); 7              Console.WriteLine("1" + studentMS.Writing() + studentMS.Reading()); 8              //MySqlDAL.Student studentMySql = new MySqlDAL.Student(); 9              //Console.Write(studentMySql.Writing() + studentMySql.Reading());10 　　　　　}　　　　　　}

3.实现客户端调用---接口编程 依赖抽象

 1  class Program 2     { 3         static void Main(string[] args) 4         { 5       　　　　//2.接口编程 依赖抽象    要切换数据库改动较多 6              IStudent student = new MSDAL.Student();//Student类对象还是出现在前台, 紧耦合 7             // IStudent student = new MySqlDAL.Student(); 8              Console.WriteLine("2" + student.Writing() + student.Reading()); 9         }10     }     

4.实现客户端调用---反射解耦

 1  class Program 2     { 3         static void Main(string[] args) 4         { 5              //3.反射解耦             6             string assemblyName = "MSDAL";//程序集名称 7             string className = assemblyName + ".Student";//类的全名称 8             //IOC(控制反转):对象在被创建的时候，由一个调控系统内所有对象的外界实体，将其所依赖的对象的引用，传递给它 9             IStudent studentReflection = (IStudent)Assembly.Load(assemblyName).CreateInstance(className);10             Console.WriteLine("3" + studentReflection.Writing() + studentReflection.Reading());   11     　　}12     }     

5.实现客户端调用---反射+配置文件

 1 class Program 2     { 3         static void Main(string[] args) 4         { 5  6             //4.反射+配置文件 7             string assemblyNameConfiguration = ConfigurationManager.AppSettings["DAL"]; //程序集名称 可在配置文件中灵活切换数据层 8             string classNameConfiguration = assemblyNameConfiguration + ".Student";//类的全名称 9 10             //IOC(控制反转):对象在被创建的时候，由一个调控系统内所有对象的外界实体，将其所依赖的对象的引用，传递给它11             IStudent studentConfiguration = (IStudent)Assembly.Load(assemblyNameConfiguration).CreateInstance(classNameConfiguration);12             Console.WriteLine("4" + studentConfiguration.Writing() + studentConfiguration.Reading());13             }14     }            

6.实现客户端调用---Spring.Net创建对象解耦

　需要添加Spring.Core.dll程序集引用

 1   class Program 2     { 3         static void Main(string[] args) 4         { 5      　　　　//5.Spring.Net创建对象 6             IApplicationContext SpringContext = Spring.Context.Support.ContextRegistry.GetContext();//spring容器 7             IStudent studentSpring = (IStudent)SpringContext.GetObject("DAL");//创建实例对象 8             Console.WriteLine("5" + studentConfiguration.Writing() + studentConfiguration.Reading()); 9         }10     }

 配置文件  

 1 <?xml version="1.0"?> 2 <configuration> 3   <configSections> 4     <sectionGroup name="spring"> 5         <section name="context" type="Spring.Context.Support.ContextHandler, Spring.Core"/> 6         <section name="objects" type="Spring.Context.Support.DefaultSectionHandler, Spring.Core"/> 7       </sectionGroup> 8   </configSections> 9 <spring>10     <context>11       <!--<resource uri="~/Objects.xml"/>-->12       <resource uri="config://spring/objects"/>13     </context>    14     <objects>    15       <object id="DAL" type="MSDAL.Student,MSDAL"></object>16     </objects>17   18   </spring>19 <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup></configuration>

7.实现客户端调用---Unity 创建对象解耦

　需要添加Microsoft.Practices.Unity.dll和Microsoft.Practices.Unity.Configuration.dll程序集引用

 1  class Program 2     { 3         static void Main(string[] args) 4         { 5              //6.Unity 创建对象 6             IUnityContainer mycontainer = new UnityContainer();//Unity容器 7             UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");//配置文件信息 8             section.Configure(mycontainer);//将配置文件信息给Unity容器         9             IStudent studentUnity = mycontainer.Resolve<IStudent>();//创建实例对象10             Console.WriteLine("6" + studentUnity.Writing() + studentUnity.Reading());  11         }12     }    

配置文件

 1 <?xml version="1.0"?> 2 <configuration> 3   <configSections> 4  5     <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration"/> 6  </configSections> 7 <unity> 8     <container>      9       <register type="IDAL.IStudent,IDAL" mapTo="MSDAL.Student,MSDAL">10         <lifetime type="singleton"/>11       </register>12     </container>13   </unity>14 15 <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup>16 </configuration>