private string GetLocalPlanVersion(int planId) { //[{"boxId":1, "boxVersion":"123"}, {"boxId":2, "boxVersion":"234"}] ContentModel localModel = PlayerPrefsUtil.GetLocalContentModel(planId); string json = ""; List <BoxVersion> boxVersions = new List <BoxVersion>(); if (localModel.IsNotNull()) { foreach (var boxModel in localModel.boxList) { BoxVersion box = new BoxVersion(); box.boxId = boxModel.boxId; box.boxVersion = boxModel.boxVersion; boxVersions.Add(box); } } if (boxVersions.Count > 0) { json = JsonConvert.SerializeObject(boxVersions, Formatting.None); } return(json); }