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POHow to add an item to an ISet<T>?
 

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    <p>I have three classes called <code>Broker</code>, <code>Instrument</code> and <code>BrokerInstrument</code>.</p> <pre><code>using Iesi.Collections.Generic; public class Broker : ActiveDefaultEntity { public virtual string Name { get; set; } public virtual ISet&lt;BrokerInstrument&gt; BrokerInstruments { get; set; } } public class Instrument : Entity { public virtual string Name { get; set; } public virtual string Symbol {get; set;} public virtual ISet&lt;BrokerInstrument&gt; BrokerInstruments { get; set; } public virtual bool IsActive { get; set; } } public class BrokerInstrument : Entity { public virtual Broker Broker { get; set; } public virtual Instrument Instrument { get; set; } public virtual decimal MinIncrement { get; set; } } </code></pre> <p>If I create three new objects (one of each type) using those classes how to I associate them? For example:</p> <pre><code>Instrument instrument = new Instrument { Name = "Test Instrument", Symbol = "Test", IsActive = true }; Broker broker = new Broker { Name = "My Test Broker", IsActive = true, IsDefault = false }; BrokerInstrument brokerInstrument = new BrokerInstrument { Broker = broker, Instrument = instrument, MinIncrement = 0.01M }; </code></pre> <p>How does the <code>instrument</code> "know" that a new <code>brokerInstrument</code> is now associated with it? If I now run <code>if (instrument.Brokerinstruments == null)</code> I get <code>true</code>. Do I have to associate the objects in both the <code>BrokerInstrument</code> declaration and then go back and add it to the <code>instrument.BrokerInstruments ISet</code>?</p> <p>If I try and do: <code>instrument.BrokerInstruments.Add(instrument)</code> I get an error because its null. Confused. What am I missing? What is the best way to model relationships like this? these objects will get persisted to a database using NHibernate.</p>
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