我正在尝试序列化2个ListView中的对象，ListView#2用于显示分组的对象，而ListView#2显示上述组。（选择#1中的组将显示#2中的不同对象集）

JsonSerializer serializer = new JsonSerializer();
        using (StreamWriter sw = new StreamWriter(path + "\\data.txt"))
        {
            foreach (ListViewItem group in lV_groups.Items)
            {
                foreach (ListViewItem item in lV_items.Items)
                {
                    List<ItemSerObj> itemsObj = new List<ItemSerObj>()
                    {
                        new ItemSerObj
                        {
                            ItemName = item.SubItems[0].Text,
                            Value = item.SubItems[1].Text,
                            Quality = item.SubItems[2].Text,
                            TimeStamp = item.SubItems[3].Text
                        }
                    };

                    GroupSerObj serializeGroup = new GroupSerObj
                    {
                        GroupName = group.SubItems[0].Text,
                        UpdateRate = group.SubItems[1].Text,
                        Active = group.SubItems[2].Text,
                        Items = itemsObj

                    };

                    using (JsonWriter writer = new JsonTextWriter(sw))
                    {
                        serializer.Serialize(writer, serializeGroup); //Where exception occurs.
                    }
                }
            }
        }

出现“系统.对象处理异常：“无法写入已关闭的TextWriter”“异常。