1、使用LINQ to JSON前，需要引用Newtonsoft.Json的dll和using Newtonsoft.Json.Linq的命名空间。LINQ to JSON主要使用到JObject, JArray, JProperty和JValue这四个对象，
JObject用来生成一个JSON对象，简单来说就是生成”{}”，
JArray用来生成一个JSON数组，也就是”[]”，
JProperty用来生成一个JSON数据，格式为key/value的值，
而JValue则直接生成一个JSON值
最终生成Json 格式输出。
BLL.addeditemgroup addeditemgroupBLL = new BLL.addeditemgroup();
DataSet ds = addeditemgroupBLL.GetEditDataList(Id);
JArray ja = new JArray();
if (ds.Tables[0].Rows.Count>0)
{
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
JObject jo = new JObject(
new JProperty("id",ds.Tables[0].Rows[i]["id"]),
new JProperty("itemtypename", ds.Tables[0].Rows[i]["itemtypename"]),
new JProperty("addeditemgroupname", ds.Tables[0].Rows[i]["addeditemgroupname"]),
new JProperty("bId", ds.Tables[0].Rows[i]["bId"]),
new JProperty("addedItemItemName", ds.Tables[0].Rows[i]["addedItemItemName"]),
new JProperty("bigName", ds.Tables[0].Rows[i]["bigName"]));
ja.Add(jo);
}
}
JObject joReturn = new JObject(new JProperty("data", ja),
new JProperty("rsm",1),
new JProperty("errno",""),
new JProperty("errEng", "Operation succeeded"),
new JProperty("err",""));
return joReturn.ToString();
或者：
JObject joReturn = new JObject(new JProperty("data", new JObject(new JProperty("list",ja))),
new JProperty("rsm",1),
new JProperty("errno",""),
new JProperty("errEng", "Operation succeeded"),
new JProperty("err",""));