MEF 组合异常

发布于 2024-10-05 08:21:36 字数 759 浏览 5 评论 0原文

我收到以下消息的 CompositionException 异常： “‘SomeService’类型的 ComposablePart 无法重新组合，因为它处于无效状态。只有在已经完全预览或组合后才能重新组合。”

这段代码抛出异常：

public class SomeService : ISomeService
{       
   [Import(typeof(ISomeType))]
   public ISomeType SomeType { get; set; }

   public SomeService()
   {
      Container.ComposeParts(this);
   }
}

但是一切都很好：

public class SomeService : ISomeService
{       
   [Import(typeof(ISomeType))]
   public ISomeType SomeType { get; set; }

   public SomeService()
   {
      this.SomeType = Container.GetExportedValue<ISomeType>();
   }
}

我在其他地方有这个代码“Container.ComposeParts(this)”并且它可以工作，但在这里却不行。

在谷歌搜索“无法重组，因为它处于无效状态”后，我没有发现任何有趣的东西。

这个消息是什么意思？谢谢你！

原文

I have the CompositionException exception with this message:
"The ComposablePart of type 'SomeService' cannot be recomposed because it is in an invalid state. It can only be recomposed if it has already been fully previewed or composed."

Exception is thrown by this code:

public class SomeService : ISomeService
{       
   [Import(typeof(ISomeType))]
   public ISomeType SomeType { get; set; }

   public SomeService()
   {
      Container.ComposeParts(this);
   }
}

but everything fine with this:

public class SomeService : ISomeService
{       
   [Import(typeof(ISomeType))]
   public ISomeType SomeType { get; set; }

   public SomeService()
   {
      this.SomeType = Container.GetExportedValue<ISomeType>();
   }
}

I have this code "Container.ComposeParts(this)" in other places and it works but here it doesn't.

I didn't found nothing interesting after googling with "cannot be recomposed because it is in an invalid state".

What does this message mean?
Thank you!

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