NopCommerce架构分析(一)Autofac依赖注入类生成容器

namespace Nop.Core.Infrastructure.DependencyManagement 
{ 
 public enum ComponentLifeStyle 
 { 
  Singleton = 0, 
  Transient = 1, 
  LifetimeScope = 2 
 } 
} 

namespace Nop.Core.Infrastructure.DependencyManagement 
{ 
 /// <summary> 
 /// Configures the inversion of control container with services used by Nop. 
 /// </summary> 
 public class ContainerConfigurer 
 { 
  public virtual void Configure(IEngine engine, ContainerManager containerManager, EventBroker broker, NopConfig configuration) 
  { 
   //other dependencies 
   containerManager.AddComponentInstance<NopConfig>(configuration, "nop.configuration"); 
   containerManager.AddComponentInstance<IEngine>(engine, "nop.engine"); 
   containerManager.AddComponentInstance<ContainerConfigurer>(this, "nop.containerConfigurer"); 
 
   //type finder 
   containerManager.AddComponent<ITypeFinder, WebAppTypeFinder>("nop.typeFinder"); 
 
   //register dependencies provided by other assemblies 
   var typeFinder = containerManager.Resolve<ITypeFinder>(); 
   containerManager.UpdateContainer(x => 
   { 
    var drTypes = typeFinder.FindClassesOfType<IDependencyRegistrar>(); 
    var drInstances = new List<IDependencyRegistrar>(); 
    foreach (var drType in drTypes) 
     drInstances.Add((IDependencyRegistrar)Activator.CreateInstance(drType)); 
    //sort 
    drInstances = drInstances.AsQueryable().OrderBy(t => t.Order).ToList(); 
    foreach (var dependencyRegistrar in drInstances) 
     dependencyRegistrar.Register(x, typeFinder); 
   }); 
 
   //event broker 
   containerManager.AddComponentInstance(broker); 
  } 
 } 
}

namespace Nop.Core.Infrastructure.DependencyManagement 
{ 
 public interface IDependencyRegistrar 
 { 
  /// <summary> 
  /// 此方法在通过ContainerBuilder注册依赖关系。 
  /// </summary> 
  /// <param name="builder">容器管理者类</param> 
  /// <param name="typeFinder">类型查找者接口</param> 
  void Register(ContainerBuilder builder, ITypeFinder typeFinder); 
  /// <summary> 
  /// 注册排序序号 
  /// </summary> 
  int Order { get; } 
 } 
}

//set dependency resolver 
var dependencyResolver = new NopDependencyResolver();
DependencyResolver.SetResolver(dependencyResolver);