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//新增或者更新SPListItem中的多选字段
SPFieldMultiChoiceValue values = new SPFieldMultiChoiceValue();
      foreach (JObject item7 in item3)
      {
          var itemChoiceName = item7.GetValue("key").ToString();
          //var itemChoiceValue = item7.GetValue("value").ToString();
          values.Add(itemChoiceName);
      }
      spListItem[itemName] = values;