AutoFac使用方法总结:Part III

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

  [Fact]

    public void per_dependency()

    {

        var builder = new ContainerBuilder();

        builder.RegisterType<MyClass>().InstancePerDependency();

        IContainer container = builder.Build();

        var myClass1 = container.Resolve<MyClass>();

        var myClass2 = container.Resolve<MyClass>();

        Assert.NotEqual(myClass1,myClass2);

    }

Single Instance也很好理解，就是每次都用同一个对象

  [Fact]

    public void single_instance()

    {

        var builder = new ContainerBuilder();

        builder.RegisterType<MyClass>().SingleInstance();

      

        IContainer container = builder.Build();

        var myClass1 = container.Resolve<MyClass>();

        var myClass2 = container.Resolve<MyClass>();

      

        Assert.Equal(myClass1,myClass2);

    }

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

  [Fact]

    public void per_lifetime_scope()

    {

        var builder = new ContainerBuilder();

        builder.RegisterType<MyClass>().InstancePerLifetimeScope();

      

        IContainer container = builder.Build();

        var myClass1 = container.Resolve<MyClass>();

        var myClass2 = container.Resolve<MyClass>();

      

        ILifetimeScope inner = container.BeginLifetimeScope();

        var myClass3 = inner.Resolve<MyClass>();

        var myClass4 = inner.Resolve<MyClass>();

      

        Assert.Equal(myClass1,myClass2);

        Assert.NotEqual(myClass2,myClass3);

        Assert.Equal(myClass3,myClass4);

    }

   [Fact]

    public void life_time_and_dispose()

    {

        var builder = new ContainerBuilder();

        builder.RegisterType<Disposable>();



        using (IContainer container = builder.Build())

        {

            var outInstance = container.Resolve<Disposable>(new NamedParameter("name", "out"));



            using(var inner = container.BeginLifetimeScope())

            {

                var inInstance = container.Resolve<Disposable>(new NamedParameter("name", "in"));

            }//inInstance dispose here

        }//out dispose here

    }