一、官方的示例代码说的不清不楚

获取SN函数的Uri应该使用不带域名的Uri

比如：最终请求地址为https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321时
AKSNCaculater.CaculateAKSN中的uri参数应该使用https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321

获取SN的时候参数的顺序是怎么样的，发送请求的时候参数的顺序就必须是怎么样

比如：获取SN的时候参数顺序是ip=119.126.10.15&coor=gcj02&ak=123456，那么最终请求地址就应该是https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321

无论如何SN必须在最终请求地址的最后！

比如以上情况下：https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&sn=654321&ak=123456就是一个错误的地址

二、官方MD5加密是错的！

这一个真是把我害惨了，折腾了半天终于发现正确代码（我也是copy别人的，但不管怎么说，官方的MD5加密代码确实是错的）

正确的加密过程如下

public static string MD52(string password)

        {

            try

            {

                System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create();

                byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));

                var md5_str = BitConverter.ToString(hash_out).Replace("-", "");

                return md5_str.ToLower();

            }

            catch

            {

                throw;

            }

        }

　　完整类如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SATPlatform

{

    public class AKSNCaculater

    {

        public static string MD52(string password)

        {

            try

            {

                System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create();

                byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));

                var md5_str = BitConverter.ToString(hash_out).Replace("-", "");

                return md5_str.ToLower();

            }

            catch

            {

                throw;

            }

        }

        public static string MD5(string password)

        {

            byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(password);

            try

            {

                System.Security.Cryptography.MD5CryptoServiceProvider cryptHandler;

                cryptHandler = new System.Security.Cryptography.MD5CryptoServiceProvider();

                byte[] hash = cryptHandler.ComputeHash(textBytes);

                string ret = "";

                foreach (byte a in hash)

                {

                    ret += a.ToString("x");

                }

                return ret;

            }

            catch

            {

                throw;

            }

        }

        public static string UrlEncode(string str)

        {

            str = System.Web.HttpUtility.UrlEncode(str);

            byte[] buf = Encoding.ASCII.GetBytes(str);//等同于Encoding.ASCII.GetBytes(str)

            for (int i = 0; i < buf.Length; i++)

                if (buf[i] == '%')

                {

                    if (buf[i + 1] >= 'a') buf[i + 1] -= 32;

                    if (buf[i + 2] >= 'a') buf[i + 2] -= 32;

                    i += 2;

                }

            return Encoding.ASCII.GetString(buf);//同上，等同于Encoding.ASCII.GetString(buf)

        }

        public static string HttpBuildQuery(IDictionary<string, string> querystring_arrays)

        {

            StringBuilder sb = new StringBuilder();

            foreach (var item in querystring_arrays)

            {

                sb.Append(UrlEncode(item.Key));

                sb.Append("=");

                sb.Append(UrlEncode(item.Value));

                sb.Append("&");

            }

            sb.Remove(sb.Length - 1, 1);

            return sb.ToString();

        }

        public static string CaculateAKSN(string ak, string sk, string url, IDictionary<string, string> querystring_arrays)

        {

            var queryString = HttpBuildQuery(querystring_arrays);

            var str = UrlEncode(url + "?" + queryString + sk);

            return MD52(str);

        }

    }

}

以上就是我被坑的经历，希望对其他人有用~~~

最后再附带上我的请求代码

/// <summary>

/// 返回指定IP的位置对应的百度城市代码（利用百度地图API

/// </summary>

/// <param name="IP">需要查询的IP地址</param>

/// <returns></returns>

public string GetPlace(string IP)

{

    DataTable BasicIn = Reader("SELECT Th_MapAK , Th_MapSK FROM S_Inf");

    Dictionary<string, string> P = new Dictionary<string, string>()

    {

        {"ip",IP },

        {"coor","gcj02" },

        {"ak",BasicIn.Rows[0]["Th_MapAK"].ToString() }

        //{"address","百度大厦" },

        //{"output","json" },

        //{"ak","yourak" }

    };

    string GetSN = AKSNCaculater.CaculateAKSN(BasicIn.Rows[0]["Th_MapAK"].ToString(), BasicIn.Rows[0]["Th_MapSK"].ToString(), "/location/ip", P);

    //string GetSN = AKSNCaculater.CaculateAKSN("yourak", "yoursk", "/geocoder/v2/", P);

    HttpWebRequest NewRequest = (HttpWebRequest)WebRequest.Create("https://api.map.baidu.com/location/ip?" + AKSNCaculater.HttpBuildQuery(P) + "&sn=" + GetSN);

    NewRequest.Headers.Add("charset", "utf-8");

    NewRequest.Method = "GET";

    NewRequest.ContentType = "application/json";

    NewRequest.UserAgent = "Windows KeHuDuan";

    NewRequest.Timeout = 5000;//设置超时时间

    HttpWebResponse Response = (HttpWebResponse)NewRequest.GetResponse();

    Stream ResponseStream = Response.GetResponseStream();

    StreamReader ResponseStreamReader = new StreamReader(ResponseStream);

    string Res = ResponseStreamReader.ReadToEnd();

    ResponseStreamReader.Close();

    ResponseStream.Close();

    JObject ResJ = new JObject();

    try

    { ResJ = JObject.Parse(Res); }

    catch (Exception)

    { GiveErr(ErrCode.ThirdPartyError); }

    if (ResJ["status"].ToString() != "0")

        GiveErr(ErrCode.ThirdPartyError);

    return ResJ["content"]["address_detail"]["city_code"].ToString();

}

　　

出处：https://www.cnblogs.com/nahida/p/17526893.html

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C#百度地图开放平台211sn校验失败解决方法

一、官方的示例代码说的不清不楚

二、官方MD5加密是错的！