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POUsing Autofac for DI into WCF service hosted in ASP.NET application
 

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    <p>I'm having trouble injecting services dependencies into my WCF service using Autofac 1.4.5. I've read and followed the <a href="http://code.google.com/p/autofac/wiki/WcfIntegration" rel="noreferrer">Autofac wiki page on WcfIntegration</a> but my debugging shows me that my WCF service is created by the <code>System.ServiceModel.Dispatcher.InstanceBehavior.GetInstance()</code> method and not by the <code>AutofacWebServiceHostFactory</code>. What am I doing wrong?</p> <p>I've set up my <code>ajax.svc</code> file to look like the one in the example for use with <code>WebHttpBinding</code>:</p> <pre><code>&lt;%@ ServiceHost Language="C#" Debug="true" Service="Generic.Frontend.Web.Ajax, Generic.Frontend.Web" Factory="Autofac.Integration.Wcf.AutofacWebServiceHostFactory, Autofac.Integration.Wcf" %&gt; </code></pre> <p>My WCF service class <code>Ajax</code> is defined like this:</p> <pre><code>namespace Generic.Frontend.Web { [ServiceContract] [AspNetCompatibilityRequirements( RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class Ajax { public MapWebService MapWebService { get; set;} public Ajax() { // this constructor is being called } public Ajax(MapWebService mapWebService) { // this constructor should be called MapWebService = mapWebService; } [WebGet(ResponseFormat = WebMessageFormat.Json)] [OperationContract(Name = "mapchange")] public MapChangeResult ProcessMapChange(string args) { // use the injected service here var result = MapWebService.ProcessMapChange(args); return result; } } } </code></pre> <p>Now I've used the wiring up in the <code>Global.asax.cs</code> as shown in the wiki mentioned above:</p> <pre><code>var builder = new ContainerBuilder(); builder.RegisterModule(new AutofacModuleWebservice()); var container = builder.Build(); AutofacServiceHostFactory.Container = container; </code></pre> <p>with</p> <pre><code>class AutofacModuleWebservice : Module { protected override void Load(ContainerBuilder builder) { builder.Register&lt;Ajax&gt;(); builder.Register&lt;MapWebService&gt;().ContainerScoped(); } } </code></pre> <p>In my web.config I have</p> <pre><code>&lt;services&gt; &lt;service name="Generic.Frontend.Web.Ajax"&gt; &lt;endpoint address="http://mysite.com/ajax.svc/" binding="webHttpBinding" contract="Generic.Frontend.Web.Ajax" /&gt; &lt;/service&gt; &lt;/services&gt; </code></pre> <p>.</p> <p>The service already works fine but I can't get the Autofac bits (read: creation/injection) to work. Any ideas?</p> <p><strong>Edit:</strong> Removing the default constructor unfortunately leads to the following exception:</p> <pre><code>System.InvalidOperationException: The service type provided could not be loaded as a service because it does not have a default (parameter-less) constructor. To fix the problem, add a default constructor to the type, or pass an instance of the type to the host. </code></pre> <p>Cheers, Oliver</p>
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    1. CODid you solve this? I have a similar problem and I have asked my question here -> http://stackoverflow.com/questions/16489403/using-autofac-with-ajax-enabled-wcf-service
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      1. UScodingjoe
    2. COUnfortunately, no. That's also the reason why there's nothing marked as answer, here :-|
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      1. USOliver
    3. COHow do you host it? iis, was, selfhosting? You should write that down in your question I think. You write different code depending on this.
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      1. POUsing Autofac for DI into WCF service hosted in ASP.NET application
      1. USJohan
 

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