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一、当查询得到的数据符合前台要求，不需要做任何处理，直接DataList To Json 返回前台。
1 var allEntities = service.QueryByPage(this.GetSearchFilter(searchModel), "InsertedDateUtc Descending", pageSize, searchModel.PageIndex + 1, out recordCount); 2 return Json(allEntities, JsonRequestBehavior.AllowGet);
前台得到的Json数据（两条记录）
[ { "DocumentID": "61d09198-198e-403e-89a0-01b98402c8ca", "DocumentFileName": "189017.docx.pdf", "ContentType": "doc", "Size": 167228, "InsertedDateUtc": "/Date(1358762613167)/", "LastModifiedOnDataSource": "/Date(1358504490000)/", "UniqueIDOnDataSource": "189017", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": "ESMO-2012", "Authors": "Zi Ming Zhao", "CongressType": "Poster", "DocumentTitle": "立普妥-一级预防中的应用 ", "EntityState": 2, "EntityKey": { "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Value": "61d09198-198e-403e-89a0-01b98402c8ca" } ], "IsTemporary": false } }, { "DocumentID": "a71ea30c-b544-41fa-b008-77adcf7a0250", "DocumentFileName": "189153.docx.pdf", "ContentType": "doc", "Size": 136195, "InsertedDateUtc": "/Date(1358762610573)/", "LastModifiedOnDataSource": "/Date(1358778247000)/", "UniqueIDOnDataSource": "189153", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": null, "Authors": null, "CongressType": null, "DocumentTitle": "立普妥-碾碎服用 ", "EntityState": 2, "EntityKey": { "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Value": "a71ea30c-b544-41fa-b008-77adcf7a0250" } ], "IsTemporary": false } } ]
二、当得到的数据不能满足前台需求，比如，我希望加入一个键值对存入总记录数，以方便做分页。
代码
var allEntities = service.QueryByPage(this.GetSearchFilter(searchModel), "InsertedDateUtc Descending", pageSize, searchModel.PageIndex + 1, out recordCount); string json = JsonConvert.SerializeObject(allEntities); StringBuilder sb = new StringBuilder(); sb.Append("{"); sb.Append("\"total\""); sb.Append(":280,"); sb.Append("\"rows\""); sb.Append(":"); sb.Append(json); sb.Append("}"); return Content(sb.ToString()); 或者直接用String: string jsonString = "{‘total‘:280,‘rows‘:" + json + "}"; （此方法用easyui测试时，前台无法解析）。 return Content(jsonString);
前台得到的Json数据
{ "total": 280, "rows": [ { "$id": "1", "DocumentID": "61d09198-198e-403e-89a0-01b98402c8ca", "DocumentFileName": "189017.docx.pdf", "ContentType": "doc", "Size": 167228, "InsertedDateUtc": "2013-01-21T18:03:33.167", "LastModifiedOnDataSource": "2013-01-18T18:21:30", "UniqueIDOnDataSource": "189017", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": "ESMO-2012", "Authors": "Zi Ming Zhao", "CongressType": "Poster", "DocumentTitle": "立普妥-一级预防中的应用 ", "EntityKey": { "$id": "2", "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Type": "System.Guid", "Value": "61d09198-198e-403e-89a0-01b98402c8ca" } ] } }, { "$id": "3", "DocumentID": "a71ea30c-b544-41fa-b008-77adcf7a0250", "DocumentFileName": "189153.docx.pdf", "ContentType": "doc", "Size": 136195, "InsertedDateUtc": "2013-01-21T18:03:30.573", "LastModifiedOnDataSource": "2013-01-21T22:24:07", "UniqueIDOnDataSource": "189153", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": null, "Authors": null, "CongressType": null, "DocumentTitle": "立普妥-碾碎服用 ", "EntityKey": { "$id": "4", "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Type": "System.Guid", "Value": "a71ea30c-b544-41fa-b008-77adcf7a0250" }
2、重新创建一个新Json对象，把数据装进去。然后返回前台。
var allEntities = service.QueryByPage(this.GetSearchFilter(searchModel), "InsertedDateUtc Descending", pageSize, searchModel.PageIndex + 1, out recordCount); // 创建JsonResult对象。 JsonResult j = new JsonResult() { Data = new { total = recordCount, rows = allEntities } }; //以下两个参数可选，前台接收有问题时可加上试试 // j.ContentType = "application/json"; //j.ContentEncoding = System.Text.Encoding.UTF8; //以下参数设置是否允许GET请求 j.JsonRequestBehavior = JsonRequestBehavior.AllowGet; return j; //此处不能再用 return Json(j, JsonRequestBehavior.AllowGet);//方式，否则相当于把Json又转换了一遍Json，前台接收的数据如下（我用easyui测试时，前台无法解析）。
EasyUi环境下有问题的Json
{ "ContentEncoding": null, "ContentType": null, "Data": { "total": 920, "rows": [ { "DocumentID": "61d09198-198e-403e-89a0-01b98402c8ca", "DocumentFileName": "189017.docx.pdf", "ContentType": "doc", "Size": 167228, "InsertedDateUtc": "/Date(1358762613167)/", "LastModifiedOnDataSource": "/Date(1358504490000)/", "UniqueIDOnDataSource": "189017", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": "ESMO-2012", "Authors": "Zi Ming Zhao", "CongressType": "Poster", "DocumentTitle": "立普妥-一级预防中的应用 ", "EntityState": 2, "EntityKey": { "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Value": "61d09198-198e-403e-89a0-01b98402c8ca" } ], "IsTemporary": false } }, { "DocumentID": "a71ea30c-b544-41fa-b008-77adcf7a0250", "DocumentFileName": "189153.docx.pdf", "ContentType": "doc", "Size": 136195, "InsertedDateUtc": "/Date(1358762610573)/", "LastModifiedOnDataSource": "/Date(1358778247000)/", "UniqueIDOnDataSource": "189153", "IsActive": true, "HasBeenIndexed": true, "TradeProductID": "1e04dc4d-5a68-4982-ba88-170a3f6525f5", "HasProcessedForAlerts": false, "Congress": null, "Authors": null, "CongressType": null, "DocumentTitle": "立普妥-碾碎服用 ", "EntityState": 2, "EntityKey": { "EntitySetName": "Document", "EntityContainerName": "MVCExampleEntities", "EntityKeyValues": [ { "Key": "DocumentID", "Value": "a71ea30c-b544-41fa-b008-77adcf7a0250" } ], "IsTemporary": false } } ] }, "JsonRequestBehavior": 0, "MaxJsonLength": null, "RecursionLimit": null }
三 、最后一个Json数据查看工具，很方便。
JSON Viewer
MVC中Json的使用：Controller中Json的处理
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原文地址：http://www.cnblogs.com/superfeeling/p/4872382.html
