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    <p>You get an exception because you are not initializing the BrokerInstruments property of the Instrument class (meaning the value of that property is null). To fix that, you need a constructor on Instrument:</p> <pre><code>public Instrument() { BrokerInstruments = new HashSet&lt;BrokerInstrument&gt;(); } </code></pre> <p>Now if you want notification of an Instrument being added, that's a different problem. The easiest and safest way is to make the BrokerInstruments property getter return an IEnumerable, remove the setter, and add a <code>AddBrokerInstrument</code> method:</p> <pre><code>// With this, you don't need the constructor above. private ISet&lt;BrokerInstrument&gt; _brokerInstruments = new HashSet&lt;BrokerInstrument&gt;(); public virtual IEnumerable&lt;BrokerInstrument&gt; BrokerInstruments { get { return _brokerInstruments; } // This setter should allow NHibernate to set the property while still hiding it from external callers protected set { _brokerInstruments = new HashSet&lt;BrokerInstrument&gt;(value); } } public void AddBrokerInstrument(BrokerInstrument brokerInstrument) { // Any other logic that needs to happen before an instrument is added _brokerInstruments.Add(brokerInstrument); // Any other logic that needs to happen after an instrument is added } </code></pre> <p>I use an IEnumerable above because you want to indicate to the users of this function that they are not allowed to add instruments directly to the set- they need to call your method instead.</p>
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    1. POHow to add an item to an ISet<T>?
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    1. USChris Shain
    1. USChris Shain
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    1. COLooks promising however when I run a unit test NHibernate complains with `TestFixture failed: NHibernate.PropertyNotFoundException : Could not find a setter for property 'BrokerInstruments' in class 'MooDB.Domain.Instrument'` Do I need to do something special in NHibernate now? It seems quite complicated, but all I want to do is model a one-many relationship in a domain model and then have NHibernate persist changes to the db.
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      1. USMark Allison
    2. COAh, I missed the NHibernate bit. I will modify accordingly... Done.
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    3. COAlmost! on the `protected set` line I'm getting error: `Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<MooDB.Domain.BrokerInstrument>' to 'System.Collections.Generic.ISet<MooDB.Domain.BrokerInstrument>'. An explicit conversion exists (are you missing a cast?)`
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