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    <p>I think your Something property is not getting set because singletons are instantiated when the application context is instantiated. When you call RegisterSingleton, the TestObject has already been created. The bean wiring is only done when a bean is created.</p> <p>You might be able to work around this problem by making the singleton instantiate lazily. That way it isn't instantiated until the first time it's requested. Hopefully, that's after you've registered the other singletons it needs.</p> <p>I don't know exactly what you're trying to accomplish, but if I wanted to change the wiring between some singleton beans at run time without making the beans aware of it, I would introduce some wrapper objects. Each wrapper would implement an interface and then just delegate all methods to its current target bean. To change the wiring, you just change the wrapper's target.</p> <p><strong>Update:</strong> as <a href="https://stackoverflow.com/questions/1371670/spring-registersingleton/1409554#1409554">yawn suggested</a>, Spring.NET has <a href="http://www.springframework.net/docs/1.3.0-RC1/reference/html/aop.html#aop-ts-swap" rel="nofollow noreferrer">hot-swappable target sources</a> that let you swap out the implementation of a bean at run time. Here's some sample code from the documentation that shows how to swap the bean implementation:</p> <pre><code>HotSwappableTargetSource swapper = (HotSwappableTargetSource) objectFactory.GetObject("swapper"); object oldTarget = swapper.swap(newTarget); </code></pre> <p>The XML definitions in the documentation look like this:</p> <pre><code>&lt;object id="initialTarget" type="MyCompany.OldTarget, MyCompany"&gt; &lt;/object&gt; &lt;object id="swapper" type="Spring.Aop.Target.HotSwappableTargetSource, Spring.Aop"&gt; &lt;constructor-arg&gt;&lt;ref local="initialTarget"/&gt;&lt;/constructor-arg&gt; &lt;/object&gt; &lt;object id="swappable" type="Spring.Aop.Framework.ProxyFactoryObject, Spring.Aop"&gt; &lt;property name="targetSource"&gt; &lt;ref local="swapper"/&gt; &lt;/property&gt; &lt;/object&gt; </code></pre>
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    1. COHmm you are right, lazy instantiation helped of course. Let me desribe what I want to do: I have multiple contexts for different customers. When I pull the object from a context I want to add a customer "id" (simple nhibernate object) to pulled object (service) and any other services which are referenced from the pulled object.
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    2. COSorry, I still don't really understand what you're trying to do. Try to be specific about which objects are singletons and what references you need between objects. You might find method injection helpful, it's designed to smooth over the boundaries between objects of different scopes. Here's the documentation: http://www.springframework.net/docs/1.3.0-RC1/reference/html/objects.html#objects-method-injection
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