继续我之前描述我的模式的问题（为方便起见，在此重复）：
Parties ( PartyId, ClientId, AddressId, DateTime )
Tents ( PartyId, TentDetails... )
Clowns ( PartyId, AddressId, ClownDetails... )
SecurityAgentAssignment ( PartyId, AgentId, fromTime, untilTime )
Addresses ( AddressId, Street, City, State )
....还有大约 10 个其他类似设计的表：都与Parties.
我的 ASP.NET MVC Web 应用程序有一个摘要页面，其中显示了有关派对的所有详细信息。我正在使用 EF1.0，所以我必须自己进行热切加载。这是我正在使用的逻辑：
Party dbParty = GetParty(partyId);
dbParty.Tents.EnsureLoaded();
dbParty.Clowns.EnsureLoaded();
foreach(Clown clown in dbParty.Clowns) clown.Address.EnsureLoaded();
dbParty.Security.EnsureLoaded();
foreach(SecurityAgentAssignment assignment in dbParty.Security) assignment.Agent.EnsureLoaded();
// and the 10 other relationships too
上面的代码运行大约需要 3 秒。鉴于这不是急切加载，而是延迟加载，它肯定应该只触发大约 15 个简单的 SELECT 查询并完成吗？
我没有安装 SQL Server Profiler，也不知道如何在您使用.Load而不是IQueryable.
我使用这些扩展方法作为助手：
private static readonly R.FieldInfo _entityReferenceContext = typeof(RelatedEnd).GetField("_context", R.BindingFlags.Instance | R.BindingFlags.NonPublic );
private static readonly R.PropertyInfo _relatedEndOwner = typeof(RelatedEnd).GetProperty("Owner", R.BindingFlags.Instance | R.BindingFlags.NonPublic );
private static Boolean IsAttached(this RelatedEnd relatedEnd) {
Object context = _entityReferenceContext.GetValue( relatedEnd );
return context != null;
}
public static TEntity EnsureLoaded<TEntity>(this EntityReference<TEntity> eref) where TEntity : class, IEntityWithRelationships {
// EntityReference<TEntity> derives from RelatedEnd.
RelatedEnd erefAsRelatedEnd = (RelatedEnd)eref;
erefAsRelatedEnd.EnsureLoaded();
return eref.Value;
}
public static void EnsureLoaded(this RelatedEnd end) {
IEntityWithRelationships owner = (IEntityWithRelationships)_relatedEndOwner.GetValue( end, null );
EntityObject ownerEntity = owner as EntityObject;
if( ownerEntity != null ) {
if( ownerEntity.EntityState == EntityState.Added || ownerEntity.EntityState == EntityState.Detached ) return; // calling .Load on a Added object causes an exception.
}
if( end.IsAttached() && !end.IsLoaded ) end.Load();
}