gistfile1.cs

public partial class MyContext
{
	private static Dictionary<Type, EntitySetBase> _mappingCache =
		new Dictionary<Type, EntitySetBase>();

	private string GetTableName(Type type)
	{
		EntitySetBase es = GetEntitySet(type);

		return string.Format("[{0}].[{1}]",
			es.MetadataProperties["Schema"].Value,
			es.MetadataProperties["Table"].Value);
	}

	private string GetPrimaryKeyName(Type type)
	{
		EntitySetBase es = GetEntitySet(type);

		return es.ElementType.KeyMembers[0].Name;
	}

	private EntitySetBase GetEntitySet(Type type)
	{
		if (!_mappingCache.ContainsKey(type))
		{
			ObjectContext octx = ((IObjectContextAdapter)this).ObjectContext;

			string typeName = ObjectContext.GetObjectType(type).Name;

			var es = octx.MetadataWorkspace
							.GetItemCollection(DataSpace.SSpace)
							.GetItems<EntityContainer>()
							.SelectMany(c => c.BaseEntitySets
											.Where(e => e.Name == typeName))
							.FirstOrDefault();

			if (es == null)
				throw new ArgumentException("Entity type not found in GetTableName", typeName);

			_mappingCache.Add(type, es);
		}

		return _mappingCache[type];
	}
}