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POCasting to generic type in non-generic method
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7864039
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2011-10-23T02:52:21.700
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2011-10-23T18:18:36.447
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2011-10-23T17:56:01.670
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What I'm doing now: <pre><code>void Main() { var command1 = new PersistenceCommand(new MyIntBO()); var command2 = new PersistenceCommand(new MyGuidBO()); var command3 = new PersistenceCommand(new PersistentBO()); Console.WriteLine(command1.ToString()); Console.WriteLine(command2.ToString()); Console.WriteLine(command3.ToString()); } public class PersistenceCommand { public PersistenceCommand(PersistentBO businessObject) { _businessObject = businessObject; } public override string ToString() { string result = _businessObject.GetType().Name; var keyed = _businessObject as IPrimaryKeyed<int>; if (keyed != null) { result += " " + keyed.Id.ToString(); } return result; } private readonly PersistentBO _businessObject; } public interface IPrimaryKeyed<out TKey> { TKey Id { get; } } public class PersistentBO {} public class MyIntBO : PersistentBO, IPrimaryKeyed<int> { public int Id { get { return 1008; } } } public class MyGuidBO : PersistentBO, IPrimaryKeyed<Guid> { public Guid Id { get { return new Guid("6135d49b-81bb-43d4-9b74-dd84c2d3cc29"); } } } </code></pre> This prints: <pre>MyIntBO 1008 MyGuidBO PersistentBO</pre> I'd like it to print: <pre>MyIntBO 1008 MyGuidBO 6135d49b-81bb-43d4-9b74-dd84c2d3cc29 PersistentBO</pre> What's the most elegant way to do that? I want to support all types of keys - <code>int</code>, <code>long</code>, <code>Guid</code>, etc. - so I'd rather not do multiple casts. Note that not every business object implements that interface (some do not have a single primary key). I realize I could use reflection and try to access the <code>Id</code> property. I was wondering if there's a better solution. Clarification: To address @Acaz Souza and @Petar Ivanov's answers, we have dozens of classes scattered over multiple assemblies that already implement <code>IPrimaryKeyed<T></code>. I do not want to break all of them by extending the interface contract. If I were designing this from scratch, their solutions would work.
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<c#><generics><c#-4.0><casting>
Title
Casting to generic type in non-generic method
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