Databases
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    <p>Well I finally had a chance to write a prototype as suggested. I think that something like this would work but I haven't tested it. Now all of your crud methods can be defined against the <code>IObjectSet&lt;&gt;</code> member.</p> <pre><code>public class Crud&lt;EntityType&gt; where EntityType : class { private readonly ObjectContext Context; private readonly IObjectSet&lt;EntityType&gt; Entities; public Crud(ObjectContext context) { Context = context; Type BaseType = GetBaseEntityType(); if (BaseType == typeof(EntityType)) { Entities = Context.CreateObjectSet&lt;EntityType&gt;(); } else { Entities = (IObjectSet&lt;EntityType&gt;)Activator.CreateInstance(typeof(ObjectSetProxy&lt;,&gt;).MakeGenericType(typeof(EntityType), BaseType), Context); } } private static Type GetBaseEntityType() { //naive implementation that assumes the first class in the hierarchy derived from object is the "base" type used by EF Type t = typeof(EntityType); while (t.BaseType != typeof(Object)) { t = t.BaseType; } return t; } } internal class ObjectSetProxy&lt;EntityType, BaseEntityType&gt; : IObjectSet&lt;EntityType&gt; where EntityType : BaseEntityType where BaseEntityType : class { private readonly IObjectSet&lt;BaseEntityType&gt; Entities; public ObjectSetProxy(ObjectContext context) { Entities = context.CreateObjectSet&lt;BaseEntityType&gt;(); } public void AddObject(EntityType entity) { Entities.AddObject(entity); } //TODO: implement remaining proxy methods public IEnumerator&lt;EntityType&gt; GetEnumerator() { return Entities.OfType&lt;EntityType&gt;().GetEnumerator(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); } public Type ElementType { get { return typeof(EntityType); } } public Expression Expression { get { return Entities.OfType&lt;EntityType&gt;().Expression; } } public IQueryProvider Provider { get { return Entities.Provider; } } } </code></pre>
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    1. POhow to convert the <T> to its base type for generic method?
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    1. USMichael Petito
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    1. CO+1 Seems like the best solution. Although my version creates the ObjectSet instance only. Otherwise you'd have to Invoke the CreateObjectContext method with reflection.
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      1. USCasey Burns
 

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