[MEF]第02篇 MEF的导入导出契约

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[Export("SQL", typeof(ILogger))]
public class SqlLogger : ILogger
{
    public void WriteLog(string message)
    {
        Console.WriteLine("SQL Logger => {0}", message);
    }
}

其中Export的第一个参数是协议名称，第二个参数则是导出的类型。对应的导入代码如下：

[Import("SQL", typeof(ILogger))]
public ILogger SqlLogger { get; set; }

[Export("Oracal")]
public class OracalLogger : ILogger
{
    public void WriteLog(string message)
    {
        Console.WriteLine("Oracal Logger => {0}", message);
    }
}

[Import("Oracal")]
public OracalLogger OracalLogger { get; set; }

其中属性的类型是OracalLogger，而不是ILogger。如果类型为ILogger，导入就会失败。

[Export(typeof(ILogger))]
public class TxtLogger : ILogger
{
    public void WriteLog(string message)
    {
        Console.WriteLine("Text Logger => {0}", message);
    }
}

[Import(typeof(ILogger))]
public ILogger TextLogger { get; set; }

[Export]
public class XmlLogger : ILogger
{
    public void WriteLog(string message)
    {
        Console.WriteLine("Xml Logger => {0}", message);
    }
}

[Import]
public XmlLogger XmlLogger { get; set; }

[MEF]第02篇 MEF的导入导出契约

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原文地址：http://blog.csdn.net/gjysk/article/details/44746875