public static class BaiduConstParams     {         public const string PlaceApIv2Search = "http://api.map.baidu.com/place/v2/search";         public const string PlaceApIv2Detail = "http://api.map.baidu.com/place/v2/detail";         public const string PlaceApIv2Eventsearch = "http://api.map.baidu.com/place/v2/eventsearch";         public const string PlaceApIv2Eventdetail = "http://api.map.baidu.com/place/v2/eventdetail";         public const string GeocodingApIv2 = "http://api.map.baidu.com/geocoder/v2/";         public const string GeocodingApIv2Reverse = "http://api.map.baidu.com/geocoder/v2/";         public const string TranslateApi = "http://openapi.baidu.com/public/2.0/bmt/translate";         public const string GeoconvApi = "http://api.map.baidu.com/geoconv/v1/";     }     public static class BaiduErrorMessages     {         public const string NotKey = "密钥不存在";         public const string LackParam = "缺少必要请求参数";     }

public enum BaiduLbsType     {         PlaceApIv2Search,         PlaceApIv2Detail,         PlaceApIv2Eventsearch,         PlaceApIv2Eventdetail,         GeocodingApIv2,         GeocodingApIv2Reverse,         Translate,         Geoconv     }     public enum Status     {         /// <summary>         /// 正常            /// </summary>         Ok = 0,         /// <summary>         /// 请求参数非法            /// </summary>         ParameterInvalid = 2,         /// <summary>         /// 权限校验失败         /// </summary>         VerifyFailure = 3,         /// <summary>         /// 配额校验失败         /// </summary>         QuotaFailure = 4,         /// <summary>         /// 不存在或者非法            /// </summary>         AkFailure = 5,         /// <summary>         /// Transform 内部错误         /// </summary>         InternalError = 1,         /// <summary>         /// from非法         /// </summary>         FromIllegal = 21,         /// <summary>         /// to非法         /// </summary>         ToIllegal = 22,         /// <summary>         /// coords非法         /// </summary>         CoordsIllegal = 24,         /// <summary>         /// coords个数非法，超过限制         /// </summary>                CoordsCountIllegal = 25     }

public class BaiduGeocodingResults     {         /// <summary>         /// 返回结果状态值， 成功返回0，其他值请查看附录。         /// </summary>         [JsonProperty(PropertyName = "status")]         public Status Status;         /// <summary>         /// 返回结果状态值， 成功返回0，其他值请查看附录。         /// </summary>         [JsonProperty(PropertyName = "result")]         public BaiduGeocodingResult Result;     }     public class BaiduGeocodingResult     {         /// <summary>         /// 经纬度坐标         /// </summary>         [JsonProperty(PropertyName = "location")]         public BaiduGeocodingLoaction Location;         /// <summary>         /// 位置的附加信息，是否精确查找。1为精确查找，0为不精确。         /// </summary>         [JsonProperty(PropertyName = "precise")]         public int Precise;         /// <summary>         /// 可信度         /// </summary>         [JsonProperty(PropertyName = "confidence")]         public int Confidence;         /// <summary>         /// 地址类型         /// </summary>         [JsonProperty(PropertyName = "level")]         public string Level;         /// <summary>         /// 结构化地址信息         /// </summary>         [JsonProperty(PropertyName = "formatted_address")]         public string FormattedAddress;         /// <summary>         /// 所在商圈信息，如 "人民大学,中关村,苏州街"         /// </summary>         [JsonProperty(PropertyName = "business")]         public string Business;         /// <summary>         /// 具体地址         /// </summary>         [JsonProperty(PropertyName = "addressComponent")]         public BaiduGeocodingAddress AddressComponent;     }     public class BaiduGeocodingLoaction     {         /// <summary>         /// 纬度值         /// </summary>         [JsonProperty(PropertyName = "lat")]         public decimal Lat;         /// <summary>         /// 经度值         /// </summary>         [JsonProperty(PropertyName = "lng")]         public decimal Lng;     }     public class BaiduGeocodingAddress     {         /// <summary>         /// 城市名         /// </summary>         [JsonProperty(PropertyName = "city")]         public string City;         /// <summary>         /// 区县名         /// </summary>         [JsonProperty(PropertyName = "district")]         public string District;         /// <summary>         /// 省名         /// </summary>         [JsonProperty(PropertyName = "province")]         public string Province;         /// <summary>         /// 街道名         /// </summary>         [JsonProperty(PropertyName = "street")]         public string Street;         /// <summary>         /// 街道门牌号         /// </summary>         [JsonProperty(PropertyName = "street_number")]         public string StreetNumber;     }

public class BaiduLbs     {         private readonly string _key;         public static string CurrentRequest = "";         public BaiduLbs(string key)         {             _key = key;         }         /// <summary>         /// 请求         /// </summary>         /// <param name="param"></param>         /// <param name="baiduLbsType"></param>         /// <param name="encoding"></param>         /// <param name="action"></param>         public void Request(string param, BaiduLbsType baiduLbsType, Encoding encoding, Action<string> action)         {             WebClient webClient = new WebClient { Encoding = encoding };             string url = "";             switch (baiduLbsType)             {                 case BaiduLbsType.PlaceApIv2Search:                     url = string.Format(BaiduConstParams.PlaceApIv2Search + "?{0}", param);                     break;                 case BaiduLbsType.PlaceApIv2Detail:                     url = string.Format(BaiduConstParams.PlaceApIv2Detail + "?{0}", param);                     break;                 case BaiduLbsType.PlaceApIv2Eventsearch:                     url = string.Format(BaiduConstParams.PlaceApIv2Eventsearch + "?{0}", param);                     break;                 case BaiduLbsType.PlaceApIv2Eventdetail:                     url = string.Format(BaiduConstParams.PlaceApIv2Eventdetail + "?{0}", param);                     break;                 case BaiduLbsType.GeocodingApIv2:                 case BaiduLbsType.GeocodingApIv2Reverse:                     url = string.Format(BaiduConstParams.GeocodingApIv2 + "?{0}", param);                     break;                 case BaiduLbsType.Translate:                     url = string.Format(BaiduConstParams.TranslateApi + "?{0}", param);                     break;                 case BaiduLbsType.Geoconv:                     url = string.Format(BaiduConstParams.GeoconvApi + "?{0}", param);                     break;             }             CurrentRequest = url;             action(webClient.DownloadString(url));         }         /// <summary>         /// 响应         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="param"></param>         /// <param name="baiduLbsType"></param>         /// <param name="encoding"></param>         public T Response<T>(string param, BaiduLbsType baiduLbsType, Encoding encoding)         {             T t = default(T);             Request(param, baiduLbsType, encoding, json =>                 {                     if (baiduLbsType == BaiduLbsType.GeocodingApIv2 || baiduLbsType == BaiduLbsType.GeocodingApIv2Reverse)                     {                         if (json.Contains("\"result\":[]"))                         {                             json = json.Replace("\"result\":[]", "\"result\":{}");                         }                     }                     t = (T)JsonConvert.DeserializeObject(json, typeof(T));                 });             return t;         }         public BaiduGeocodingResults BaiduGeocoding(string address, string city)         {             address = System.Web.HttpUtility.UrlEncode(address);             city = System.Web.HttpUtility.UrlEncode(city);             string request = string.Format("address={0}&output=json&ak={1}&city={2}", address, _key, city);             var result = Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8);             if (result.Status == Status.Ok && result.Result.Location == null)             {                 request = string.Format("address={0}&output=json&ak={1}&city={2}", city + address, _key, city);                 return Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8);             }             return result;         }         public BaiduGeocodingResults BaiduGeocoding(string longitude, string dimensions, string pois)         {             var location = longitude + "," + dimensions;             string request = string.Format("ak={0}&location={1}&pois={2}", _key, location, pois);             return Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8);         }               public GeoconvResults BaiduGeoconv(GeoconvParams geoconvParams, ref List<GeoconvPOI> geoconvPois)         {             geoconvParams.Ak = _key;             return Response<GeoconvResults>(geoconvParams.ToString(ref geoconvPois), BaiduLbsType.Geoconv, Encoding.UTF8);         }         public GeoconvResults BaiduGeoconv(GeoconvParams geoconvParams, GeoconvPOI geoconvPoi)         {             geoconvParams.Ak = _key;             List<GeoconvPOI> geoconvPois = new List<GeoconvPOI>                                                {                                                    geoconvPoi                                                };             return Response<GeoconvResults>(geoconvParams.ToString(ref geoconvPois), BaiduLbsType.Geoconv, Encoding.UTF8);         }     }