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POCaliburn Micro Constructor Injection Failed
 

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  1. POCaliburn Micro Constructor Injection Failed
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    <p>I am learning Caliburn Micro and try to make use of the <code>EventAggregator</code> from the <a href="http://caliburnmicro.codeplex.com/wikipage?title=The%20Event%20Aggregator" rel="nofollow noreferrer">official site</a>. </p> <p>However, I got an exception </p> <blockquote> <p>"No parameterless constructor defined for this object."</p> </blockquote> <p>The message itself is clear but the example doesn't include a parameterless constructor either. If i add one, the constructor with parameter is not hit and the <code>IEventAggregator</code> is still not injected correctly.</p> <p>Here is my publisher VM after adding the parameterless constructor (without it, exception will be thrown):</p> <pre><code> public MainViewModel() { } public MainViewModel(IEventAggregator ea) : this() { eventAggregator = ea; } </code></pre> <p>And here is the bootstrapper i am using:</p> <pre><code>public class AppBootstrapper : Bootstrapper&lt;MainViewModel&gt; { private readonly SimpleContainer container = new SimpleContainer(); protected override void Configure() { container.Singleton&lt;IEventAggregator, EventAggregator&gt;(); } } </code></pre> <p>Here is the example from CM:</p> <pre><code>// Creating the EventAggregator as a singleton. public class Bootstrapper : BootstrapperBase { private readonly SimpleContainer _container = new SimpleContainer(); // ... Other Bootstrapper Config protected override void Configure(){ _container.Singleton&lt;IEventAggregator, EventAggregator&gt;(); } // ... Other Bootstrapper Config } // Acquiring the EventAggregator in a viewModel. public class FooViewModel { private readonly IEventAggregator _eventAggregator; public FooViewModel(IEventAggregator eventAggregator) { _eventAggregator = eventAggregator; } } </code></pre> <p>I checked this post (<a href="https://stackoverflow.com/questions/17372268/inject-eventaggregator-into-viewmodel-with-caliburn-micro">Inject EventAggregator into ViewModel with Caliburn Micro</a>) but it simply said nothing why the CM do not invoke the constructor with injection.</p> <p>I also checked the CM's sample solution but it uses MEF as the DI solution.</p> <p>What do I miss?</p>
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    1. COIt's been a while since I looked at Caliburn, but are you sure that your bootstrapper is actually started, can get instances, etc? Check out this http://caliburnmicro.codeplex.com/SourceControl/latest#samples/Caliburn.Micro.HelloSimpleContainer/Caliburn.Micro.HelloSimpleContainer/Bootstrapper.cs simple container sample, it doesn't use MEF or anything
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      1. POCaliburn Micro Constructor Injection Failed
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    2. CO@MaksimS. The Configure() is executed; I tried to add the Start() to the bootstrapper constructor but no luck. Moreover, the example doesn't inject anything in the VM.
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    3. CODon't have anything to test your code on at the moment; however, just took a look at EventAggregator code in the latest build and it _does_ contain parameterless constructor, at least in micro.wpf. Are you by any chance using EventAggregator from Prism, or something else instead of Caliburn's? I know it sounds silly, but still :)
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