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public int Test()
{
int NeedID = 0;//你要的东东
ModelClass Exp = new ModelClass() { name = "123" };
using (myEntities j = new myEntities())
{
try
{
j.ModelClass.Add(Exp);
j.SaveChanges();
//EF 回写了 Exp 实例的ID属性
NeedID = Exp.ID;
}
catch(Exception ex)
{
//throw new Exception( ex.Message);
}
}
return NeedID;
}

Student student = CurrentDal.AddEntity(student entity);
classentity.student Id = student .id;
CurrentDB .classentityDal.AddEntity(classentity);
CurrentDBSession.SaveChange ();
return student.id