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    <p>When using MEF, you cannot export properties or methods (as types) of some class, you need to export the class itself, so your code should be like this:</p> <pre><code> [Export(typeof(Handler))] public class HandlerUser : Handler { public string Name { get; set; } public HandlerUser() : base() { } } </code></pre> <p>But since you are using MEF, this means that you are trying to add extensibility to you application, considering this, i would make "Handle" an Interface and not a class, so this way anyone can implement the way they want, they just need to implement the interface.</p> <p>In this case, would be like:</p> <pre><code> public interface IHandler { string Message { get; } public void Create(string msg); } [Export(typeof(Handler))] public class HandlerUser : IHandler { public string Name { get; set; } public string Message { get; private set;} public HandlerUser() { } public void Create(string msg) { this.Message = msg } } </code></pre> <p><strong>Edit:</strong></p> <p>I have updated the answer to be clear about how MEF works with exports, you can in fact export a property, but not in the context of the question. When you do this, you will be exporting by the property name "Handler" and not the typeof(Handler) like you do in Class definition. Property and method exports are a cool feature, but there are some limitations (the max number of parameters of a method export is 4!), prefer Class Exports where possible.</p> <p>More information on exporting using MEF can be found <a href="https://mef.codeplex.com/wikipage?title=Declaring%20Exports" rel="nofollow">here</a></p>
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    1. POC#: MEF Exporting Properties
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    1. USGabriel Vonlanten C. Lopes
    1. USGabriel Vonlanten C. Lopes
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    1. COYou're wrong - exporting is possible for both properties and methods.
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      1. USAdi Lester
    2. CONo, exporting is not available in this context, he wants to export the class, so he can get them by type definition. Exporting does really works for properties, but you export a String and not the type, their declaration is different. But i will update the answer to make this more clear.
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      1. USGabriel Vonlanten C. Lopes
    3. COIt is possible to export two instances of the class by having two exporting properties where the getters return the fully constructed object. Not saying that it's the way to go, but it is possible.
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