.net Mef与企业库5.0 [英] .net Mef with Enterprise Library 5.0

问题描述

我想将mef与Enterprise Library 5.0的Logging和Exception块一起使用.

I am wanting to use mef with the Logging and Exception Blocks of Enterprise Library 5.0.

我正在做的是我有一个定义为MEF在目录中查找的插件.然后将其导入给我.但是我也在插件中使用日志记录和异常处理，我希望能够通过mef插入LogWriter和ExceptionWriter的实例.该示例向您展示了如何统一处理，因为我正在使用mef来获取插件并将其实例化，因此无法正常工作.

What I am doing is I have a plugin defined that MEF is looking for in a directory. It then imports it for me. However I am using logging and exception handling in the plugin also and I would like to be able to insert the instance of the LogWriter and ExceptionWriter via mef. The example shows you how to do it with unity which won't work since I am using mef to get the plugin and instantiate it.

谢谢

推荐答案

您可以使用以下类导出LogWriter:

You can export LogWriter with a class like this:

public class LogWriterExporter
{

    [Export(typeof(LogWriter))]
    public LogWriter LogWriter
    {
        get
        {
            return new LogWriter(...);
        }
    }
}

请注意，MEF通常只会调用一次此属性获取器，除非进口商要求CreationPolicy.NonShared.如果要强制执行单例行为，则可以向该类显式添加[PartCreationPolicy(CreationPolicy.Shared)]属性.

Note that MEF will typically call this property getter only once, except if an importer demands CreationPolicy.NonShared. If you want to enforce singleton behavior, then you can explicitly add a [PartCreationPolicy(CreationPolicy.Shared)] attribute to the class.

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