0
我有这个类:实体未创建问题
public partial class User
{
private MyEntities _entities;
public User()
{
}
public User(MyEntities entities)
{
_entities = entities;
}
public IEnumerable<User> GetUsersRegisteredNewsletter()
{
return (from u in _entities.Users
where u.Subscribe_Newsletter == true
select u);
}
public IEnumerable<CallTimeOption> GetUserCallTimeOptions
{
get
{
//_entities = new LighthouseEntities();
// if we uncomment the line above it works
var query = from a in _entities.Users.Include("CallTimeOptions")
where a.Id == this.Id
&& a.CallTimeOptions.Any()
select a.CallTimeOptions;
return query.SelectMany(i => i);
}
}
}
}
现在,当我打电话GetUserCallTimeOptions它抛出一个错误
MyEntities _entities = new MyEntities();
User user = new User(_entities);
IEnumerable<User> u = user.GetUsersRegisteredNewsletter();
foreach (var a in u)
{
foreach (var y in user.GetUserCallTimeOptions)
Response.Write(y.Text);
}
“不设置到对象的实例对象引用”
但如果我取消注释GetUserCAllTimeOptions上的这一行,那么它的工作原理如下:
_entities = new LighthouseEntities();
不需要再次创建_entities,不应该这样工作吗?
@sinelaw ,你的意思是删除“私人MyEntities_entities”;来自用户类? – user441365 2011-01-23 16:04:08