InstancePerDependency (默认的) 每一次Resolve创建一个不同对象出来
SingleInstance 单一的,同一个对象
InstancePerLifetimeScope 同一个生命周期获得一样的对象,不同周期有不同对象(想想httpContxt)
ContainerBuilder.Build() 是从IContainer中接口中继承 而IContainer从ILifetimeScope而来
ILifetimeScope 也可以自己构造 ,从现在IContainer 弹射更远的范围 IContainer.BeginLifetimeScope();
或这样的 (ILifetimeScope)HttpContext.Current.Items[typeof(ILifetimeScope)](ILifetimeScope 难道是key、value的方式存??,具体原码没有研究)
以下代码
var builder = new ContainerBuilder(); builder.RegisterType().As ().Keyed ("SqlDatabase").InstancePerDependency(); builder.RegisterType ().As ().Keyed ("MySqlDatabase").InstancePerLifetimeScope(); builder.RegisterType ().As ().Keyed ("OracleDatabase").SingleInstance(); builder.RegisterType ().WithParameter(ResolvedParameter.ForKeyed ("SqlDatabase")); using (var container = builder.Build()) { var sqlDatabase1 = container.ResolveKeyed ("SqlDatabase"); var sqlDatabase2 = container.ResolveKeyed ("SqlDatabase"); var or1 = container.ResolveKeyed ("OracleDatabase"); var or2 = container.ResolveKeyed ("OracleDatabase"); var m1 = container.ResolveKeyed ("MySqlDatabase"); var m2 = container.ResolveKeyed ("MySqlDatabase"); ILifetimeScope inner = container.BeginLifetimeScope(); var s1 = inner.ResolveKeyed ("SqlDatabase"); var s2 = inner.ResolveKeyed ("SqlDatabase"); var m3 = inner.ResolveKeyed ("MySqlDatabase"); var m4 = inner.ResolveKeyed ("MySqlDatabase"); var o1 = inner.ResolveKeyed ("OracleDatabase"); var o2 = inner.ResolveKeyed ("OracleDatabase"); Debug.WriteLine(string.Format("container SqlDatabase={0}", object.ReferenceEquals(sqlDatabase1, sqlDatabase2))); Debug.WriteLine(string.Format("container MySqlDatabase={0}", object.ReferenceEquals(m1, m2))); Debug.WriteLine(string.Format("container OracleDatabase={0}", object.ReferenceEquals(or1, or2))); Debug.WriteLine(string.Format("inner. SqlDatabase ={0}", object.ReferenceEquals(s1, s2))); Debug.WriteLine(string.Format("inner MySqlDatabase={0}", object.ReferenceEquals(m3, m4))); Debug.WriteLine(string.Format("inner OracleDatabase={0}", object.ReferenceEquals(o1, o2))); Debug.WriteLine(string.Format("container MySqlDatabase 与inner MySqlDatabase={0} ", object.ReferenceEquals(m1, m4))); Debug.WriteLine(string.Format("container SqlDatabase 与inner SqlDatabase={0} ", object.ReferenceEquals(sqlDatabase1, s1))); Debug.WriteLine(string.Format("container OracleDatabase 与inner OracleDatabase={0} ", object.ReferenceEquals(or1, o1)));
无论是Autofac 还是spring.net 还是其它的IOC这样的工具,不是万能的,它仅仅是解决了类的创建的设计模式,类的创建时间和方式,与传统的配置文件创建方式(load assembly ,Activator)有很多优势,一,效率,(传统方式效率不高,无论emit还是delagate)二、有着生命周期,三、方便性,使用很方便
而在程 序结构上我们还需设计好自己结构的设计模式。个人意见,欢迎指正。