C＃ 高德地图 根据经纬度获取地址

using System;
using System.IO;
using System.Net;
using System.Text;

namespace PhotoHelper
{
    public class AmapUtil
    {
        private const string Key = "3ee6df6847015dec899aa46032226fa0";

        /// <summary>
        ///     根据经纬度获取地址
        /// </summary>
        /// <param name="lngLatStr">经度纬度组成的字符串 例如:"113.692100,34.752853"</param>
        /// <param name="timeout">超时时间默认10秒</param>
        /// <returns>失败返回"" </returns>
        public static string GetLocationByLngLat(string lngLatStr, int timeout = 10000)
        {
            var url = $"http://restapi.amap.com/v3/geocode/regeo?key={Key}&location={lngLatStr}";
            return GetLocationByUrl(url, timeout);
        }

        /// <summary>
        ///     根据经纬度获取地址
        /// </summary>
        /// <param name="lng">经度 例如:113.692100</param>
        /// <param name="lat">维度 例如:34.752853</param>
        /// <param name="timeout">超时时间默认10秒</param>
        /// <returns>失败返回"" </returns>
        public static string GetLocationByLngLat(double lng, double lat, int timeout = 10000)
        {
            var url = $"http://restapi.amap.com/v3/geocode/regeo?key={Key}&location={lng},{lat}";
            return GetLocationByUrl(url, timeout);
        }

        /// <summary>
        ///     根据URL获取地址
        /// </summary>
        /// <param name="url">Get方法的URL</param>
        /// <param name="timeout">超时时间默认10秒</param>
        /// <returns></returns>
        private static string GetLocationByUrl(string url, int timeout = 10000)
        {
            var s = "";
            try
            {
                if (WebRequest.Create(url) is HttpWebRequest req)
                {
                    req.ContentType = "multipart/form-data";
                    req.Accept = "*/*"; 
                    req.UserAgent = "";
                    req.Timeout = timeout;
                    req.Method = "GET";
                    req.KeepAlive = true;
                    if (req.GetResponse() is HttpWebResponse response)
                        using (var sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                        {
                            s = sr.ReadToEnd();
                            return s;
                        }
                }
            }
            catch (Exception ex)
            {
                s = ex.ToString();
            }

            return s;
        }
    }
}

注意：文中的Key是我自己申请的个人应用，有次数和频率限制，正式环境请替换为你自己的Key。