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    copied!<p>Based on your posted code, there shouldn't be a problem.</p> <p>I created 2 projects: a console application and a class library called ThirdPartyLibrary.</p> <p>The ThirdPartyLibrary consists of the following (extrapolated from the posted code):</p> <pre><code>namespace ThirdPartyLibrary { public interface IService { string GetServiceMessage { get; } } public class Service : IService { public Service() { } public string GetServiceMessage { get { return "The message!"; } } } public static class ThirdPartyLibrary { public static ThirdPartyObj GetFooInstance() { return new ThirdPartyObj(); } } public interface IThirdPartyObj { } public class ThirdPartyObj : IThirdPartyObj { internal ThirdPartyObj() { } public IService Service { get; set; } } } </code></pre> <p>The XML Configuration looks like this:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;configSections&gt; &lt;section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/&gt; &lt;/configSections&gt; &lt;unity xmlns="http://schemas.microsoft.com/practices/2010/unity"&gt; &lt;container&gt; &lt;register type="ThirdPartyLibrary.IService, ThirdPartyLibrary" mapTo="ThirdPartyLibrary.Service, ThirdPartyLibrary"&gt; &lt;/register&gt; &lt;register type="ThirdPartyLibrary.IThirdPartyObj, ThirdPartyLibrary" mapTo="ThirdPartyLibrary.ThirdPartyObj, ThirdPartyLibrary"&gt; &lt;!-- Inject the property "Service" --&gt; &lt;property name="Service" /&gt; &lt;/register&gt; &lt;/container&gt; &lt;/unity&gt; &lt;startup&gt; &lt;supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/&gt; &lt;/startup&gt; &lt;/configuration&gt; </code></pre> <p>And the console application is:</p> <pre><code>class Program { static void Main(string[] args) { IUnityContainer container = new UnityContainer(); //create container container.LoadConfiguration(); // load from XML config ThirdPartyObj foo = ThirdPartyLibrary.ThirdPartyLibrary.GetFooInstance(); //get third party instance container.BuildUp(foo.GetType(), foo); //inyect dependencies Console.WriteLine(foo.Service.GetServiceMessage); } } </code></pre> <p>This works fine and outputs <code>The message!</code> as expected. Perhaps, the exact scenario is not the same as your posted (I assume fictitious) example or something else is not configured properly? </p>
 

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