autoFac 生命周期 试验

1.概述 autoFac的生命周期

序号	名称	说明
1	InstancePerDependency	每次请求都创建一个新的对象
2	InstancePerLifetimeScope	同一个Lifetime生成的对象是同一个实例
3	SingleInstance	每次都用同一个对象

2.注 InstancePerLifetimeScope

同一个Lifetime生成的对象是同一个实例，这个理解起来有点不确定，什么叫“同一个Lifetime生成的对象”，就是生成过的几次，比如在一个程序中，只调用一次生成。

var builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().InstancePerLifetimeScope();IContainer container = builder.Build();

只调用 一次，上面的注册，后面无论多少次获取，都是一个对象。

IA a = container.Resolve<IA>();

试验代码

 

class T2{static IContainer container;static T2(){var builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().InstancePerLifetimeScope();container = builder.Build();}public void fun(){for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}}}

3.那么“同一个Lifetime生成的对象”指创建过一次，那么这个创建指的是“InstancePerLifetimeScope”还是“Build”

于是有了下面的试验，“InstancePerLifetimeScope”一次，但是每次获取对象前都“Build”

builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().InstancePerLifetimeScope();

var container = builder.Build();

结果报了如下异常

 异常：

System.InvalidOperationException:“Build() or Update() can only be called once on a ContainerBuilder

 异常翻译：

System.InvalidOperationException: " Build()或Update()只能被ContainerBuilder调用一次

只能调用一次，那么“InstancePerLifetimeScope”和“Build”的调用次数只能是相同的，要么都同时一次，要么都同时多次。

完整代码

class T3{static ContainerBuilder builder;static T3(){builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().InstancePerLifetimeScope();}public void fun(){var container = builder.Build();for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}}}

4.另外两种生命周期，都很好理解，"SingleInstance"相当于单件，“InstancePerDependency”相当于每次都创建。（如果没有描述生命周，默认也是这个：builder.RegisterType<A>().As<IA>()）

InstancePerDependency(每次使用都是一个新的对象)

static void Main(string[] args){Console.WriteLine();var builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().InstancePerDependency();IContainer container = builder.Build();for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}Console.ReadKey();}

 SingleInstance（多次获取使用的是一个对象）

static void Main(string[] args){Console.WriteLine();var builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>().SingleInstance();IContainer container = builder.Build();for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}Console.ReadKey();}

6.对比试验

	生命周期	对象中创建	类中创建
	InstancePerDependency	每次获取的都是新对象	每次获取的都是新对象
	InstancePerLifetimeScope	在创建对象的容器中是一个对象	每次获取的都是新对象
	SingleInstance	在创建对象的容器中是一个对象	每次获取的都是新对象

这里创建指：build

var builder = new ContainerBuilder();builder.RegisterType<A>().As<IA>())container = builder.Build();

这里的使用指：resolve

IA a = container.Resolve<IA>();a.fun();

在对象中创建，指在构造函数中创建，每创建一个对象，就创建一次。

在类中创建，指在静态类中创建，无论多少个类，指创建一次。

代码

using Autofac;
using Autofac.Builder;
using System;
using System.Collections.Generic;namespace autoFac生命周期2
{class Program{static void Main(string[] args){Console.WriteLine();Program p = new Program();p.main();Console.ReadKey();}private void main(){foreach (EnumLeftFun enumLeftFun in Enum.GetValues(typeof(EnumLeftFun))){T.enumLeftFunMy = enumLeftFun;Console.WriteLine("\n------------"+enumLeftFun+"--------------------------------");test1();test2();}//test3();}private void test1(){Console.WriteLine("    test1 每个对象创建一次");T1 t1 = new T1();t1.fun();T1 t2 = new T1();t2.fun();}private void test2(){Console.WriteLine("    test2 每个类创建一次");T2 t21 = new T2();t21.fun();T2 t22 = new T2();t22.fun();}private void test3(){T3 t3 = new T3();t3.fun();T3 t31 = new T3();t31.fun();}class T2 : T{static IContainer container;static T2(){var builder = new ContainerBuilder();T.leftSelect(builder.RegisterType<A>().As<IA>());container = builder.Build();}public void fun(){for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}}}class T3{static ContainerBuilder builder;static T3(){builder = new ContainerBuilder();T.leftSelect(builder.RegisterType<A>().As<IA>());}public void fun(){var container = builder.Build();for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}}}class T1:T{IContainer container;public T1(){var builder = new ContainerBuilder();leftSelect(builder.RegisterType<A>().As<IA>());builder.RegisterType<A>().As<IA>().SingleInstance();container = builder.Build();}public void fun(){for (int i = 0; i < 3; i++){IA a = container.Resolve<IA>();a.fun();}}}delegate IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> delegateFun(IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> registrationBuilder);public enum EnumLeftFun{InstancePerDependency,InstancePerLifetimeScope,SingleInstance}class T{static Dictionary<EnumLeftFun, delegateFun> keyValuePairs = new Dictionary<EnumLeftFun, delegateFun>();public static EnumLeftFun enumLeftFunMy;static T(){keyValuePairs.Add(EnumLeftFun.InstancePerDependency, InstancePerDependency);keyValuePairs.Add(EnumLeftFun.InstancePerLifetimeScope, InstancePerLifetimeScope);keyValuePairs.Add(EnumLeftFun.SingleInstance, SingleInstance);}static public IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> leftSelect(IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> registrationBuilder){return keyValuePairs[enumLeftFunMy](registrationBuilder);}static protected IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> InstancePerDependency(IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> registrationBuilder){return registrationBuilder.InstancePerDependency();}static protected IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> InstancePerLifetimeScope(IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> registrationBuilder){return registrationBuilder.InstancePerLifetimeScope();}static protected IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> SingleInstance(IRegistrationBuilder<IA, ConcreteReflectionActivatorData, SingleRegistrationStyle> registrationBuilder){return registrationBuilder.SingleInstance();}}}interface IA{void fun();}class A : IA{static int index = 0;private int myIndex;public A(){this.myIndex = ++index;}public void fun(){Console.WriteLine("myIndex:" + myIndex);}}
}

运行结果

------------InstancePerDependency--------------------------------test1 每个对象创建一次
myIndex:1
myIndex:1
myIndex:1
myIndex:2
myIndex:2
myIndex:2test2 每个类创建一次
myIndex:3
myIndex:4
myIndex:5
myIndex:6
myIndex:7
myIndex:8------------InstancePerLifetimeScope--------------------------------test1 每个对象创建一次
myIndex:9
myIndex:9
myIndex:9
myIndex:10
myIndex:10
myIndex:10test2 每个类创建一次
myIndex:11
myIndex:12
myIndex:13
myIndex:14
myIndex:15
myIndex:16------------SingleInstance--------------------------------test1 每个对象创建一次
myIndex:17
myIndex:17
myIndex:17
myIndex:18
myIndex:18
myIndex:18test2 每个类创建一次
myIndex:19
myIndex:20
myIndex:21
myIndex:22
myIndex:23
myIndex:24