AOP之PostSharp7-解决IOC 不能直接new问题，简化IOC开发和IOC对象LazyLoad

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using Microsoft.Practices.Unity; 
using Microsoft.Practices.Unity.Configuration; 
using Microsoft.Practices.Unity.InterceptionExtension; 

namespace PostSharpDemo 
{ 
    [Serializable] 
     public  class IocUnityResolverAttribute : PostSharp.Aspects.LocationInterceptionAspect 
    { 
         private Dictionary< string, Microsoft.Practices.Unity.Configuration.UnityConfigurationSection> sectionCache =  new Dictionary< string, Microsoft.Practices.Unity.Configuration.UnityConfigurationSection>(); 
         private  static  object lockObj =  new  object(); 
         public IocUnityResolverAttribute( string Container) 
        { 
             this.Container = Container; 
        } 

         public  string Container 
        { 
             get; 
             set; 
        } 

         public  string ConfigFile 
        { 
             get; 
             set; 
        } 

         public  string Name 
        { 
             get; 
             set; 
        } 

         public Microsoft.Practices.Unity.Configuration.UnityConfigurationSection GetUnityConfigurationSection() 
        { 
             if (! string.IsNullOrEmpty( this.ConfigFile)) 
            { 
                Microsoft.Practices.Unity.Configuration.UnityConfigurationSection section =  null; 
                 if (!sectionCache.ContainsKey( this.ConfigFile)) 
                { 
                     lock (lockObj) 
                    { 
                         if (!sectionCache.ContainsKey( this.ConfigFile)) 
                        { 
                             var fileMap =  new System.Configuration.ExeConfigurationFileMap { ExeConfigFilename = System.IO.Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory,  this.ConfigFile) }; 
                            System.Configuration.Configuration configuration = System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(fileMap, System.Configuration.ConfigurationUserLevel.None); 
                             if (configuration ==  null) 
                            { 
                                 throw  new Exception( string.Format( " Unity配置{0}不正确; ",  this.ConfigFile)); 
                            } 
                            section = configuration.GetSection(Microsoft.Practices.Unity.Configuration.UnityConfigurationSection.SectionName)  as Microsoft.Practices.Unity.Configuration.UnityConfigurationSection; 
                            sectionCache.Add( this.ConfigFile, section); 
                        } 
                    } 
                } 
                 return sectionCache[ this.ConfigFile]; 
            } 

             return System.Configuration.ConfigurationManager.GetSection(Microsoft.Practices.Unity.Configuration.UnityConfigurationSection.SectionName)  as Microsoft.Practices.Unity.Configuration.UnityConfigurationSection; 
        } 

         public  override  void OnGetValue(PostSharp.Aspects.LocationInterceptionArgs args) 
        { 
             var current = args.GetCurrentValue(); 
             if (current ==  null) 
            { 
                 var unitySection =  this.GetUnityConfigurationSection(); 
                 if (unitySection !=  null) 
                { 
                     var container =  new Microsoft.Practices.Unity.UnityContainer().LoadConfiguration(unitySection,  string.IsNullOrEmpty(Container) ? unitySection.Containers.Default.Name : Container); 
                     var obj =  string.IsNullOrEmpty(Name) ? container.Resolve(args.Location.LocationType) : container.Resolve(args.Location.LocationType, Name); 
                     if (obj !=  null) 
                    { 
                         // var piabAtttr = obj.GetType().GetCustomAttributes(typeof(ELPolicyinjectionAttribute), false) as ELPolicyinjectionAttribute[]; 
                         // if (piabAtttr.Length > 0) 
                         // { 
                         //     obj = Microsoft.Practices.EnterpriseLibrary.PolicyInjection.PolicyInjection.Wrap(type, obj); 
                         // } 
                        args.Value = obj; 
                        args.ProceedSetValue(); 
                    } 
                } 
            } 
            args.ProceedGetValue(); 
        } 

         public  override  bool CompileTimeValidate(PostSharp.Reflection.LocationInfo locationInfo) 
        { 
             var p = locationInfo.PropertyInfo;           
             if (p !=  null) 
            {               
                 var attrs = p.GetCustomAttributes( typeof(Microsoft.Practices.Unity.DependencyAttribute),  true)  as Microsoft.Practices.Unity.DependencyAttribute[]; 
                 if (attrs !=  null && attrs.Length >  0) 
                { 
                     return  true; 
                } 
            } 
             return  false; 
        } 
    } 
}