MEF和EF Intercepters

Question

我有什么似乎是直接的MEF导出。

[Export(typeof(IDbCommandInterceptor))] 
[PartCreationPolicy(CreationPolicy.NonShared)] 
public class LoggingCommandInterceptor : IDbCommandInterceptor 
{ 
    [Import] 
    private ILogging _ILogger;   

    public void NonQueryExecuting(
    DbCommand command, DbCommandInterceptionContext<int> interceptionContext) 
    { 
     Log(command, interceptionContext); 
    } 

    private void Log<TResult>(
    DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext) 
    { 
     if (!interceptionContext.IsAsync) 
     { 
      _ILogger.LogWarn("Non-async command used: {0}", command.CommandText); 
     } 
     else 
      _ILogger.LogTrace("command used: {0}", command.CommandText); 
    } 
    ect..... 

则线上高达

public class EFConfiguration : DbConfiguration 
{ 

    public EFConfiguration() 
    { 
     AddInterceptor(new LoggingCommandInterceptor()); 
    } 

} 

所以，问题是导入[Ilogging在LoggingCommandInterceptor总是空的永远充满，当我检查我的作文containter我看到导出正确注册，所以我为什么我的进口不满意？

Answer 1

这种攻击方式不一样，我用下面的后MEF容器是设置

[Import] 
    private IDbCommandInterceptor _LoggingCommandInterceptor; 
public MefConfig() 
    {   
    // MEF SETUP ... /// 
System.Data.Entity.Infrastructure.Interception.DbInterception.Add(_LoggingCommandInterceptor); 

    } 

预期其中一期工程。