在asp.net页面上得到Castle容器的实例

  在项目中使用 Castle IOC 容器， Asp.net 程序中如何得到 Castle 容器内。

可以如下实现：

1、Gloabal实现接口IContainerAccessor

public class Global : System.Web.HttpApplication, IContainerAccessor
      {

         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
          private System.ComponentModel.IContainer components = null;
          private static WindsorContainer container;
         
         public Global()
         {
              InitializeComponent();
         }   

         protected void Application_Start(Object sender, EventArgs e)
         {
              container = new MyContainer(new XmlInterpreter("app_config.xml"));
         } 

          protected void Session_Start(Object sender, EventArgs e)
         {

         }

……
    protected void Application_End(Object sender, EventArgs e)
    {
              container.Dispose();
    } 

          #region IContainerAccessor implementation

         public IWindsorContainer Container
         {
              get { return container; }
         }
             
}

    2、使用如下类来获取容器实例，这段代码来自Castle.MVC
     /// <summary>
     /// Uses the HttpContext and the <see cref="IContainerAccessor"/> 
     /// to access the container instance.
     /// </summary>
     public abstract class ContainerWebAccessorUtil
     {

         /// <summary>
         /// 从application中获取一个容器实例
         /// </summary>
         /// <returns>返回一个 IWindsorContainer</returns>
         public static IWindsorContainer ObtainContainer()
         {

              IContainerAccessor containerAccessor =

                   HttpContext.Current.ApplicationInstance as IContainerAccessor;  
              if (containerAccessor == null)
              {
                   throw new ApplicationException("你必须在HttpApplication中实现接口 IContainerAccessor 暴露容器的属性”);

              }    

              IWindsorContainer container = containerAccessor.Container;  
              if (container == null)
              {
                   throw new ApplicationException("HttpApplication 得不到容器的实例");
              }
              return container;

         }
     } 

3、在具体的用户控件，页面的后置代码中通过ContainerWebAccessorUtil. ObtainContainer()获取容器实例。当然如果使用Castle.MVC，MVC框架也是这样用的,自己就不要这么麻烦了，可以将这个写在页面和控件的基类中。