C#通过地址获取省市区（基于百度地图API）

最近公司有个需求，想通过地址获取对应的省市区，本来想直接通过对地址的截取，对于完整的地址还可以，不完整的就没法用了

所以本篇通过百度地图API来获取地址

第一步：申请ak密钥

登录百度地图开放平台，按照提示一步步申请即可，效果如下

第二步：根据地理编码API获取地址对应的经纬度

ak为密钥，123456是随便填的，填上你自己的ak即可

            string ak="123456";
            string Url = @"http://api.map.baidu.com/geocoding/v3/?address="+txtAddress.Text.Trim()+"&output=json&ak=" + ak;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();
            response.Close();
            request.Abort();

            txtLocation.Text = retString;

            JObject obj_RawData = (JObject)(JsonConvert.DeserializeObject(retString));
            JObject obj_Result = (JObject)(JsonConvert.DeserializeObject(obj_RawData["result"].ToString()));
            JObject obj_Loaction = (JObject)(JsonConvert.DeserializeObject(obj_Result["location"].ToString()));
            string lng = obj_Loaction["lng"].ToString(); //经度值
            string lat = obj_Loaction["lat"].ToString(); //纬度值

第三步：在根据逆地理编码API获取经纬度对应的省市区

            Url = @"http://api.map.baidu.com/reverse_geocoding/v3/?ak=" + ak + "&output=json&coordtype=bd09ll&location=" + lat + "," + lng;

            request = (HttpWebRequest)WebRequest.Create(Url);
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json";

            response = (HttpWebResponse)request.GetResponse();
            myResponseStream = response.GetResponseStream();
            myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();
            response.Close();
            request.Abort();

以上代码可获取对应的省市区，返回的json例子如下：

"addressComponent": {
"country": "中国",
"country_code": 0,
"country_code_iso": "CHN",
"country_code_iso2": "CN",
"province": "浙江省",
"city": "嘉兴市",
"city_level": 2,
"district": "平湖市",
"town": "",
"adcode": "330482",
"street": "兴平一路",
"street_number": "",
"direction": "附近",
"distance": "2"
}