阿里大魚還未提供 .net core 版SDK，但提供了相關API，下面是.net core版實現，只是簡單發送短信功能： 

using System;using System.Collections.Generic;using System.IO;using System.Net;using System.Security.Cryptography;using System.Text;using Newtonsoft.Json;namespace ConsoleApp1{  public class SmsHelper  {    public static string Post(string url, string data, Encoding encoding)    {      try      {        HttpWebRequest req = WebRequest.CreateHttp(new Uri(url));        req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";        req.Method = "POST";        req.Accept = "text/xml,text/javascript";        req.ContinueTimeout = 60000;        byte[] postData = encoding.GetBytes(data);        Stream reqStream = req.GetRequestStreamAsync().Result;        reqStream.Write(postData, 0, postData.Length);        reqStream.Dispose();        var rsp = (HttpWebResponse)req.GetResponseAsync().Result;        var result = GetResponseAsString(rsp, encoding);        return result;      }      catch (Exception ex)      {        throw;      }    }    public static T Post<T>(string url, string data, Encoding encoding)    {      try      {        var result = Post(url, data, encoding);        return JsonConvert.DeserializeObject<T>(result);      }      catch (Exception ex)      {        return default(T);      }    }    public static string BuildQuery(IDictionary<string, string> parameters)    {      if (parameters == null || parameters.Count == 0)      {        return null;      }      StringBuilder query = new StringBuilder();      bool hasParam = false;      foreach (KeyValuePair<string, string> kv in parameters)      {        string name = kv.Key;        string value = kv.Value;        // 忽略參數名或參數值為空的參數        if (!string.IsNullOrEmpty(name) && !string.IsNullOrEmpty(value))        {          if (hasParam)          {            query.Append("&");          }          query.Append(name);          query.Append("=");          query.Append(WebUtility.UrlEncode(value));          hasParam = true;        }      }      return query.ToString();    }    public static string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)    {      Stream stream = null;      StreamReader reader = null;      try      {        // 以字符流的方式讀取HTTP響應        stream = rsp.GetResponseStream();        reader = new StreamReader(stream, encoding);        return reader.ReadToEnd();      }      finally      {        // 釋放資源        if (reader != null) reader.Dispose();        if (stream != null) stream.Dispose();        if (rsp != null) rsp.Dispose();      }    }    public static string GetAlidayuSign(IDictionary<string, string> parameters, string secret, string signMethod)    {      //把字典按Key的字母順序排序      IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(parameters, StringComparer.Ordinal);      //把所有參數名和參數值串在一起      StringBuilder query = new StringBuilder();      if (Constants.SIGN_METHOD_MD5.Equals(signMethod))      {        query.Append(secret);      }      foreach (KeyValuePair<string, string> kv in sortedParams)      {        if (!string.IsNullOrEmpty(kv.Key) && !string.IsNullOrEmpty(kv.Value))        {          query.Append(kv.Key).Append(kv.Value);        }      }      //使用MD5/HMAC加密      if (Constants.SIGN_METHOD_HMAC.Equals(signMethod))      {        return Hmac(query.ToString(), secret);      }      else      {        query.Append(secret);        return Md5(query.ToString());      }    }    public static string Hmac(string value, string key)    {      byte[] bytes;      using (var hmac = new HMACMD5(Encoding.UTF8.GetBytes(key)))      {        bytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(value));      }      StringBuilder result = new StringBuilder();      foreach (byte t in bytes)      {        result.Append(t.ToString("X2"));      }      return result.ToString();    }    public static string Md5(string value)    {      byte[] bytes;      using (var md5 = MD5.Create())      {        bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(value));      }      var result = new StringBuilder();      foreach (byte t in bytes)      {        result.Append(t.ToString("X2"));      }      return result.ToString();    }    public static SmsResultAli SendSms(string url, string appKey, string appSecret, DateTime timestamp, Dictionary<string, string> parsms)    {      var txtParams = new SortedDictionary<string, string>();      txtParams.Add(Constants.METHOD, "alibaba.aliqin.fc.sms.num.send");      txtParams.Add(Constants.VERSION, "2.0");      txtParams.Add(Constants.SIGN_METHOD, Constants.SIGN_METHOD_HMAC);      txtParams.Add(Constants.APP_KEY, appKey);      txtParams.Add(Constants.FORMAT, "json");      txtParams.Add(Constants.TIMESTAMP, timestamp.ToString(Constants.DATE_TIME_FORMAT));      txtParams.Add(Constants.SMS_TYPE, "normal");      foreach (var item in parsms)      {        txtParams.Add(item.Key,item.Value);      }      txtParams.Add(Constants.SIGN, GetAlidayuSign(txtParams, appSecret, Constants.SIGN_METHOD_HMAC));      var result = Post<SmsResultAli>(url, BuildQuery(txtParams), Encoding.UTF8);      return result;    }  }  public class SmsResultAli  {    public SmsResponseALi Alibaba_Aliqin_Fc_Sms_Num_Send_Response { get; set; }  }  public class SmsResponseALi  {    public string Request_Id { get; set; }    public SmsResponseResultAli Result { get; set; }  }  public class SmsResponseResultAli  {    public string Err_Code { get; set; }    public string Model { get; set; }    public bool Success { get; set; }  }}