Import object by ExportMetadata attribute in MEF

I would like to ask, is it possible to impor开发者_如何学Ct some object by ExportMetadata value ? For example, string. Or If I declared some Export objects by name and type can I import all of them by just only type ?

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You would need to defer the creation of the part through either Lazy or ExportFactory. E.g, given my sample type:

[Export(typeof(ILogger)), ExportMetadata("Name", "Console")]
public class ConsoleLogger : ILogger
{

}

I would need a metadata interface:

public interface INamedMetadata
{
  string Name { get; }
}

Then I could import many instances as:

[ImportMany(typeof(ILogger))]
IEnumerable<Lazy<ILogger, INamedMetadata>> Loggers { get; set; }

And make a selection:

public ILogger GetLogger(string name)
{
  return Loggers
    .Where(l => l.Metadata.Name.Equals(name))
    .Select(l => l.Value)
    .FirstOrDefault();
}