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PORetrieve NHibernate.Collections.Generic.PersistentGenericBag as IList<T> using Reflection
 

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  1. PORetrieve NHibernate.Collections.Generic.PersistentGenericBag as IList<T> using Reflection
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    <p>I'm attempting to compare a transient object graph to an NHibernate-persisted object graph. Unfortunately my code breaks where properties of type <code>IList&lt;T&gt;</code> are concerned. The code below works fine with instances of <code>List&lt;T&gt;</code>, because <code>List&lt;T&gt;</code> implements both <code>IList&lt;T&gt;</code> AND <code>IList</code>. Unfortunately, NHibernate's PersistentGenericBag only implements <code>IList&lt;T&gt;</code>.</p> <pre><code>IList list1 = (IList)prop1.GetValue(object1, null); IList list2 = (IList)prop2.GetValue(object2, null); </code></pre> <p>If either object1 or object2 is a PersistentGenericBag, I get an error such as:</p> <pre><code>System.Reflection.TargetInvocationException : Exception has been thrown by the target of an invocation. ----&gt; System.InvalidCastException : Unable to cast object of type 'NHibernate.Collection.Generic.PersistentGenericBag`1[MyNamespace.MyClass]' to type 'System.Collections.Generic.List`1[MyNamespace.MyClass]'. </code></pre> <p>Is there a reliable way to retrieve the PersistentGenericBag instance as an IList&lt;T&gt; using reflection?</p> <p>I had hoped the popular <a href="http://comparenetobjects.codeplex.com/" rel="nofollow noreferrer">Compare .NET Objects</a> class would help, but it fails with the exact same error.</p> <p><strong>Edit:</strong> All the answers below are on the right track. The problem was that the getter on the problematic <code>IList&lt;T&gt;</code> property was attempting a cast to <code>List&lt;T&gt;</code>, which obviously can't be done to a PersistentGenericBag. So, my fault for the misguided question.</p>
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    1. COThe probable problem with the compare project is that it does not drill down into an object until it finds an IList implementation.
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    2. COthe error says you're trying to cast to List<T> (concrete), *not* IList<T> (interface)
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      1. USMauricio Scheffer
    3. COPersistentGenericBag<T> *does* implement both IList and IList<T>, see http://www.surcombe.com/nhibernate-1.2/api/html/T_NHibernate_Collection_Generic_PersistentGenericBag_1.htm
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