如何从Asp.Net MVC 5依赖性解析器获取Structuremap IContainer实例
我使用Structuremap作为我的依赖关系解析器。 我试图在我的Global.asax.cs文件上实现Container Per Request Pattern。
public IContainer Container { get { return (IContainer)HttpContext.Current.Items["_Container"]; } set { HttpContext.Current.Items["_Container"] = value; } } public void Application_BeginRequest() { Container = ObjectFactory.Container.GetNestedContainer(); } 由于在将来的Structuremap版本中不支持ObjectFactory，我希望从DependencyResolver访问容器。 怎么可能？
提前致谢。
Noufal
自己遇到这个问题后， 这是我用ASP.NET MVC的Dependency Resolver注册StructureMap 的最佳指南 （通过CommonServiceLocator包 ）。
我复制并粘贴了上述文章的解决方案，但我建议在原始文章中介绍此解决方案的优点。
public class StructureMapDependencyResolver : ServiceLocatorImplBase { private const string StructuremapNestedContainerKey = "Structuremap.Nested.Container"; public IContainer Container { get; set; } private HttpContextBase HttpContext { get { var ctx = Container.TryGetInstance(); return ctx ?? new HttpContextWrapper(System.Web.HttpContext.Current); } } public IContainer CurrentNestedContainer { get { return (IContainer)HttpContext.Items[StructuremapNestedContainerKey]; } set { HttpContext.Items[StructuremapNestedContainerKey] = value; } } public StructureMapDependencyResolver(IContainer container) { Container = container; } protected override IEnumerable
然后你可以这样设置解析器：
public class MvcApplication : System.Web.HttpApplication { public static StructureMapDependencyResolver StructureMapResolver { get; set; } protected void Application_Start() { ... // Setup your Container before var container = IoC.Initialize(); StructureMapResolver = new StructureMapDependencyResolver(container); DependencyResolver.SetResolver(StructureMapResolver); } protected void Application_BeginRequest(object sender, EventArgs e) { StructureMapResolver.CreateNestedContainer(); } protected void Application_EndRequest(object sender, EventArgs e) { StructureMapResolver.DisposeNestedContainer(); } }
这种配置的最佳结果是每个请求都会收到一个新的子容器，并在每个请求结束时处理容器。
我只是尝试了这个和它的工作，请让我，如果它不是最好的方式。
StructuremapMvc.StructureMapDependencyScope.Container
有两个依赖项解析器，一个用于ASP.NET MVC，另一个用于ASP.NET Web Api
Web Api：使用WebApiContrib.IoC.StructureMap.StructureMapResolver
MVC：使用StructureMapDependencyResolver
public class StructureMapDependencyResolver : StructureMapDependencyScope, IDependencyResolver { public StructureMapDependencyResolver(IContainer container) : base(container) { } public IDependencyScope BeginScope() { var child = Container.GetNestedContainer(); return new StructureMapDependencyResolver(child); } } public class StructureMapDependencyScope : ServiceLocatorImplBase, IDependencyScope { protected readonly IContainer Container; public StructureMapDependencyScope(IContainer container) { if (container == null) { throw new ArgumentNullException(nameof(container)); } Container = container; } public void Dispose() { Container.Dispose(); } public override object GetService(Type serviceType) { if (serviceType == null) { return null; } return serviceType.IsAbstract || serviceType.IsInterface ? Container.TryGetInstance(serviceType) : Container.GetInstance(serviceType); } public IEnumerable
用法如下……
public static class Ioc { public static void Config() { var container = InitializeContainer(); var webApiDependencyResolver = new StructureMapResolver(container); GlobalConfiguration.Configuration.DependencyResolver = webApiDependencyResolver; var mvcDependencyResolver = new StructureMapDependencyResolver(container); DependencyResolver.SetResolver(mvcDependencyResolver); } } public class WebApiApplication : System.Web.HttpApplication { protected void Application_Start() { Ioc.Config(); ... } }