AutoFac使用方法总结三：生命周期

生命周期

AutoFac中的生命周期概念非常重要，AutoFac也提供了强大的生命周期管理的能力。
AutoFac定义了三种生命周期：

Per Dependency
Single Instance
Per Lifetime Scope

Per Dependency为默认的生命周期，也被称为’transient’或’factory’，其实就是每次请求都创建一个新的对象

 1    [Fact]
 2     public void per_dependency()
 3     {
 4         var builder = new ContainerBuilder();
 5         builder.RegisterType<MyClass>().InstancePerDependency();
 6         IContainer container = builder.Build();
 7         var myClass1 = container.Resolve<MyClass>();
 8         var myClass2 = container.Resolve<MyClass>();
 9         Assert.NotEqual(myClass1,myClass2);
10     }

Single Instance也很好理解，就是每次都用同一个对象

 1     [Fact]
 2     public void single_instance()
 3     {
 4         var builder = new ContainerBuilder();
 5         builder.RegisterType<MyClass>().SingleInstance();
 6       
 7         IContainer container = builder.Build();
 8         var myClass1 = container.Resolve<MyClass>();
 9         var myClass2 = container.Resolve<MyClass>();
10       
11         Assert.Equal(myClass1,myClass2);
12     }

Per Lifetime Scope，同一个Lifetime生成的对象是同一个实例

 1     [Fact]
 2     public void per_lifetime_scope()
 3     {
 4         var builder = new ContainerBuilder();
 5         builder.RegisterType<MyClass>().InstancePerLifetimeScope();
 6       
 7         IContainer container = builder.Build();
 8         var myClass1 = container.Resolve<MyClass>();
 9         var myClass2 = container.Resolve<MyClass>();
10       
11         ILifetimeScope inner = container.BeginLifetimeScope();
12         var myClass3 = inner.Resolve<MyClass>();
13         var myClass4 = inner.Resolve<MyClass>();
14       
15         Assert.Equal(myClass1,myClass2);
16         Assert.NotEqual(myClass2,myClass3);
17         Assert.Equal(myClass3,myClass4);
18     }

 1     [Fact]
 2     public void life_time_and_dispose()
 3     {
 4         var builder = new ContainerBuilder();
 5         builder.RegisterType<Disposable>();
 6 
 7         using (IContainer container = builder.Build())
 8         {
 9             var outInstance = container.Resolve<Disposable>(new NamedParameter("name", "out"));
10 
11             using(var inner = container.BeginLifetimeScope())
12             {
13                 var inInstance = container.Resolve<Disposable>(new NamedParameter("name", "in"));
14             }//inInstance dispose here
15         }//out dispose here
16     }