解析Newtonsoft.Json的小例子

HttpWebRequest request = (HttpWebRequest)result.AsyncState;
HttpWebResponse response = (HttpWebResponse)(request.EndGetResponse(result));
stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream, false);
string apiText = reader.ReadToEnd();
JObject jsonObj = null;
try
{
jsonObj = JObject.Parse(apiText);
if (jsonObj.Count == 1 || (int)(jsonObj["status"]) != 0) this.isError = true;
else
{
string provinceName = (string)jsonObj["result"]["address_component"]["province"];
string cityName = this.cityName_s = (string)jsonObj["result"]["address_component"]["city"];
string districtName = (string)jsonObj["result"]["address_component"]["district"];
string street = (string)jsonObj["result"]["address_component"]["street"];

/*下面是解析JArray的部分*/
JArray jlist = JArray.Parse(jsonObj["result"]["pois"].ToString()); //将pois部分视为一个JObject，JArray解析这个JObject的字符串
LocationItem locationitem = null;      //存储附近的某个地点的信息
locations = new List<LocationItem>();  //附近位置的列表
for(int i = 0; i < jlist.Count ; ++i)  //遍历JArray
{
locationitem = new LocationItem();
JObject tempo = JObject.Parse(jlist[i].ToString());
locationitem.id = tempo["id"].ToString();
locationitem.title = tempo["title"].ToString();
locationitem._distance = tempo["_distance"].ToString();
locationitem.address = tempo["address"].ToString();
locationitem.category = tempo["category"].ToString();
locationitem.location.lat = tempo["location"]["lat"].ToString();
locationitem.location.lng = tempo["location"]["lng"].ToString();
locations.Add(locationitem);
}
}
}
catch (Exception)
{
isError = true;
}

其中使用了两个类:

public class LngLat
{
public string lat { get; set; }
public string lng { get; set; }
}
public class LocationItem
{
public string id{get;set;} //
public string title { get; set; } //名称
public string address { get; set; } //地址
public string category { get; set; } //类型
public LngLat location { get; set; } //经纬度
public string _distance { get; set; } //距离（米）

public LocationItem()
{
id = "0";
title = "";
address = "";
_distance = "0";
location = new LngLat { lng = "0", lat = "0" };
category = "";
}
}

这样就完成了这个复杂json数据的解析。JSON数组访问还有用数组下标方式的，那个就需要数组至少要有足够的个数，如要取得上面那个json数据的 中国技术大厦A座 ，就是用jsonObj["result"]["pois"][1]["title"].ToString() ,即访问了result下pois数组的第2个节点的title信息，但是要遍历所有的数据就明显不如JArray方便了。