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    <p>I'm working on a solution where the MEF parts that I want to use across WCF calls are stored in a singleton at the application level. This is all hosted in IIS. The services are decorated to be compatible with asp.net. </p> <pre><code>[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] </code></pre> <p>In Global.asax, I import the parts. </p> <pre><code>[ImportMany(typeof(IOption))] public IEnumerable&lt;IOption&gt; AvailableOptions{ get; set; } </code></pre> <p>After initializing the catalog and container, I copy the imported objects to my singleton class.</p> <pre><code>container.ComposeParts(this); foreach (var option in AvailableOptions) OptionRegistry.AddOption(option); </code></pre> <p>EDIT:</p> <p>My registry class:</p> <pre><code>public static class OptionRegistry { private static List&lt;IOption&gt; _availableOptions= new List&lt;IOption&gt;(); public static void AddOption(IOption option) { if(!_availableOptions.Contains(option)) _availableOptions.Add(option); } public static List&lt;IOption&gt; GetOptions() { return _availableOptions; } } </code></pre> <p>This works but I want to make it thread safe so I'll post that version once it's done.</p> <p>Thread-safe Registry:</p> <pre><code>public sealed class OptionRegistry { private List&lt;IOptionDescription&gt; _availableOptions; static readonly OptionRegistry _instance = new OptionRegistry(); public static OptionRegistry Instance { get { return _instance; } } private OptionRegistry() { _availableOptions = new List&lt;IOptionDescription&gt;(); } public void AddOption(IOptionDescription option) { lock(_availableOptions) { if(!_availableOptions.Contains(option)) _availableOptions.Add(option); } } public List&lt;IOptionDescription&gt; GetOptions() { return _availableOptions; } } </code></pre>
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    1. POUsing MEF in Service layer (WCF)
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    1. USjrockers
    1. USjrockers
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    1. COPlease post the thread safe solution once done!
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      1. USNilesh
    2. COThanks a lot JRockers !
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      1. USNilesh
    3. COHow is that thread safe? I see at least two race conditions: a) instantiation of OptionRegistry is not guaranteed to happen once. In this case it is without consequence (apart from some GC activity) and b) AddOption does not guarantee that options added from multiple threads simultaneously are only added once.
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      1. USChristian Klauser
 

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