小编SM.*_*SM.的帖子

我有一个具有很多属性的对象.一堆这些大对象将被插入到数据库中,但只有一个属性在更改.将要更改的属性不是主键.第一次SaveChanges成功,但后续的失败,"ObjectStateManager中已存在具有相同键的对象.....".这是代码中的流程:

    //create the entity and set the properties that don't change
    TheLargeObject obj = new TheLargeObject();
    obj.Prop1 = 
    obj.Prop2 = 
    ...
    obj.Prop20 = 

    //create a list of values that differ between each entity
    List<int> validIds = new List<int>();

    private static void SaveToDatabase(TheLargeObject obj, List<int> validIds)
    {

        foreach (int id in validIds)
        {
            //this is the only property that changes
            obj.KeyId = id;

            //make a copy - do we really need this?
            TheLargeObject newobj = new TheLargeObject();
            newobj = obj;

            using(Entities …