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    <p>This is a slightly different approach for your problem:</p> <ol> <li>Use <a href="http://msdn.microsoft.com/en-us/windowsserver/ee695849" rel="nofollow" title="Windows Server AppFabric">Windows Server AppFabric</a> for service auto-start</li> <li>Use WCF infrastructure to execute custom startup code</li> </ol> <p>Re 1: The <a href="http://msdn.microsoft.com/en-us/library/ee677260.aspx" rel="nofollow">Appfabric AutoStart feature</a> should just work out of the box (provided you're not using MVC's ServiceRoute to register your services, they MUST be specified either in the Web.config's <code>serviceActivations</code> section or using physical <code>*.svc</code> files.</p> <p>Re 2: To inject custom startup code into the WCF pipeline you could use an attribute like this:</p> <pre><code>using System; using System.ServiceModel; using System.ServiceModel.Description; namespace WCF.Extensions { /// &lt;summary&gt; /// Allows to specify a static activation method to be called one the ServiceHost for this service has been opened. /// &lt;/summary&gt; [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = false)] public class ServiceActivatorAttribute : Attribute, IServiceBehavior { /// &lt;summary&gt; /// Initializes a new instance of the ServiceActivatorAttribute class. /// &lt;/summary&gt; public ServiceActivatorAttribute(Type activatorType, string methodToCall) { if (activatorType == null) throw new ArgumentNullException("activatorType"); if (String.IsNullOrEmpty(methodToCall)) throw new ArgumentNullException("methodToCall"); ActivatorType = activatorType; MethodToCall = methodToCall; } /// &lt;summary&gt; /// The class containing the activation method. /// &lt;/summary&gt; public Type ActivatorType { get; private set; } /// &lt;summary&gt; /// The name of the activation method. Must be 'public static void' and with no parameters. /// &lt;/summary&gt; public string MethodToCall { get; private set; } private System.Reflection.MethodInfo activationMethod; #region IServiceBehavior void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection&lt;ServiceEndpoint&gt; endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters) { } void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { serviceHostBase.Opened += (sender, e) =&gt; { this.activationMethod.Invoke(null, null); }; } void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { // Validation: can get method var method = ActivatorType.GetMethod(name: MethodToCall, bindingAttr: System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public, callConvention: System.Reflection.CallingConventions.Standard, types: Type.EmptyTypes, binder: null, modifiers: null); if (method == null) throw new ServiceActivationException("The specified activation method does not exist or does not have a valid signature (must be public static)."); this.activationMethod = method; } #endregion } } </code></pre> <p>..which can be used like this:</p> <pre><code>public static class ServiceActivation { public static void OnServiceActivated() { // Your startup code here } } [ServiceActivator(typeof(ServiceActivation), "OnServiceActivated")] public class YourService : IYourServiceContract { } </code></pre> <p>That's the exact approach we've been using for quite a while and on a large number of services. The extra benefit of using a WCF <code>ServiceBehavior</code> for custom startup code (as opposed to relying on the IIS infrastructure) is that it works in any hosting environment (incl. self-hosted) and can be more easily tested.</p>
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    1. POAutoStart/Pre-warm features not working in IIS 7.5 / WCF service
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    1. POAutoStart/Pre-warm features not working in IIS 7.5 / WCF service
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    1. COFunny, we have already headed the AppFabric direction, so this is a nice dovetail. Love your code, even untested, and can see where it wants to go. Bounty's yours, but you have to keep up if I have more questions in comments ;)
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    2. CO@ServiceGuy I just wanted to clarify that your two points are dependent, (I.e. use AppFabric **AND** add a hook to the WCF infrastructure). In other words, point 2 does not solve the problem in the AutoStart IIS hosting context. Is that correct?
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    3. CO@pamphlet: Yes, 1 AND 2 would be necessary, (1) to actually auto-start your service, (2) to execute custom OnStart logic.
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