我想使用LightInject的构造函数注入功能,但是我想先清除有关IDisposables的生命周期管理的事情。
考虑以下:
例子A
public class Foo : IDisposable
{
readonly IBar bar;
public Foo(IBar bar)
{
this.bar = bar;
}
public void Dispose()
{
}
}
例子B
public class Foo : IDisposable
{
readonly IBar bar;
public Foo(Func<string, IBar> bar)
{
this.bar = bar("myParameter");
}
public void Dispose()
{
}
}
我对两个示例的疑问:
Foo被处置后,将由IBar上的LightInject调用Dispose方法,还是应该自己处置?
如果IBar使用的是PerContainerLifeTime,则在处置每个Foo实例之后会调用Dispose吗?
编辑
好吧,我意识到第二个问题很愚蠢,当容器被处置时,PerContainerLifeTime实例当然也被处置。
我的总体问题是,LightInject是否跟踪注入的依赖项并自行处理?
最佳答案
如果服务/依赖项已在PerScopeLifetime或PerRequestLifetime中注册,LightInject将仅跟踪其创建的实例。
看下面的例子:
class Program
{
private static IServiceContainer container = new ServiceContainer();
static void Main(string[] args)
{
container.Register(f => new Foo("PerScopeFoo"), "PerScopeFoo", new PerScopeLifetime());
container.Register(f => new Foo("PerRequestFoo"), "PerRequestFoo", new PerRequestLifeTime());
container.Register(f => new Foo("PerContainerFoo"), "PerContainerFoo", new PerScopeLifetime());
container.Register(f => new Foo("TransientFoo"), "TransientFoo");
using (container.BeginScope())
{
var first = container.GetInstance<Foo>("PerScopeFoo");
var second = container.GetInstance<Foo>("PerScopeFoo");
Debug.Assert(first == second);
first = container.GetInstance<Foo>("PerRequestFoo");
second = container.GetInstance<Foo>("PerRequestFoo");
Debug.Assert(first != second);
first = container.GetInstance<Foo>("PerContainerFoo");
second = container.GetInstance<Foo>("PerContainerFoo");
Debug.Assert(first == second);
first = container.GetInstance<Foo>("TransientFoo");
second = container.GetInstance<Foo>("TransientFoo");
Debug.Assert(first != second);
}
container.Dispose();
Console.ReadKey();
}
}
public class Foo : IDisposable
{
private readonly string name;
public Foo(string name)
{
this.name = name;
}
public void Dispose()
{
Console.WriteLine(name + " disposed");
}
}