autofac(3)

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

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

    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

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);
    }

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
    }