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我有Person和Dog类。 一只狗属于一个人,一个人可以有不同的狗(所以一对多)。EF问题保存几个实体之一
我有一个测试方法,从数据库中获取2人。如果一个人在db中不存在,我就可以做到。然后我想救4只狗。
这是测试:
Person person1= personResourceAccess.GetPersonByName("Person1");
if(person1==null)
{
Person person = new Person()
{
Name = "Person1"
};
person1= personResourceAccess.CreatePerson(person);
}
Person person2= personResourceAccess.GetPersonByName("Person2");
if(person2==null)
{
Person person = new Person()
{
Name = "Person2"
};
person2= personResourceAccess.CreatePerson(person);
}
Dog dog1 = new Dog(){name="Dog1", owner = person1};
Dog dog2 = new Dog(){name="Dog2", owner = person1};
Dog dog3 = new Dog(){name="Dog3", owner = person1};
Dog dog4 = new Dog(){name="Dog4", owner = person2};
dog1 = dogResourceAccess.CreateDog(dog1);
dog2 = dogResourceAccess.CreateDog(dog2);
dog3 = dogResourceAccess.CreateDog(dog3);
dog4 = dogResourceAccess.CreateDog(dog4);
这是对资源的访问代码:
public Dog CreateDog(Dog dog)
{
try
{
db.Dogs.AddObject(dog);
db.SaveChanges();
return dog;
}
catch(Exception ex)
{
return null
}
}
当我保存了第一只狗,在数据库中创建的所有其他狗。为什么会这样,我怎样才能防止它发生? 我认为这可能与上下文有关,但似乎无法解决问题。