{
  "Data":[
    {"AA":"aa1","BB":"bb1"},
    {"AA":"aa2","BB":"bb2"}
             ]
}

    class Top
    {
        public List<Data> Data { get; set; }
    }

    class Data
    {
        public string AA { get; set; }
        public string BB { get; set; }
    }


            //整体是一个Top类，data的数组是Data类，
            var top = JsonConvert.DeserializeObject<Top>(str_Json);
            var data = top.Data.ToList<Data>();

{  
    "status": 0,  
    "message": "query ok",  
    "result": {  
        "address": "北京市海淀区彩和坊路海淀西大街74号",  
        "address_component": {  
            "province": "北京市",  
            "city": "北京市",  
            "district": "海淀区",  
            "street": "彩和坊路",  
            "street_number": "海淀西大街74号"  
        },  
        "pois": [  
            {  
                "id": "3629720141162880123",  
                "title": "中国技术交易大厦",  
                "address": "北京市海淀区北四环西路66号",  
                "category": "房产小区;商务楼宇",  
                "location": {  
                    "lat": "39.984122",  
                    "lng": "116.307484"  
                },  
                "_distance": "3.6"  
            },  
            {  
                "id": "2845372667492951071",  
                "title": "中国技术交易大厦A座",  
                "address": "北京市海淀区北四环西路66号",  
                "category": "房产小区;商务楼宇",  
                "location": {  
                    "lat": "39.984273",  
                    "lng": "116.307577"  
                },  
                "_distance": "15.2"  
           }
            ]
       }
}

    class location
    {
        public string lat { get; set; }
        public string lng { get; set; }
    }

    class pois
    {
        public string id { get; set; }
        public string title { get; set; }
        public string address { get; set; }
        public string category { get; set; }
        public location location { get; set; }
        public string _distance { get; set; }

    }

            //因为整体是一个对象所以解析为jobject，dd["xx"]获取对象的属性值，path表达式
            var dd = JObject.Parse(str_Json);
            //获取属性值
            var oo = dd["message"];
            //获取数组
            var rr = JArray.Parse(dd["result"]["pois"].ToString());
            //将数据对象化
            var ii = rr.ToObject<List<pois>>();
            //数组第一个元素
            var gg = ii[0].location;

 [  
            {  
                "id": "3629720141162880123",  
                "title": "中国技术交易大厦",  
                "address": "北京市海淀区北四环西路66号",  
                "category": "房产小区;商务楼宇",  
                "location": {  
                    "lat": "39.984122",  
                    "lng": "116.307484"  
                },  
                "_distance": "3.6"  
            },  
            {  
                "id": "2845372667492951071",  
                "title": "中国技术交易大厦A座",  
                "address": "北京市海淀区北四环西路66号",  
                "category": "房产小区;商务楼宇",  
                "location": {  
                    "lat": "39.984273",  
                    "lng": "116.307577"  
                },  
                "_distance": "15.2"  
           }
            ]

            //因为整体是个数组，就解析为数组
            var rr = JArray.Parse(str_Json);
            //将数据对象化
            var ii = rr.ToObject<List<pois>>();
            //数组第一个元素
            var gg = ii[0].location;

            //对象序列化json串，单个对象序列化成Json对象{} list为数组[{}]
            //var json = new Data() { AA = "", BB = "" };
            var json = new List<Data>() { 
                new Data() { AA="11",BB="11"},
                

            };
            var dd = JsonConvert.SerializeObject(json);