c# .net 调用腾讯云短信Api的简单示例，直接复制粘贴拿去用

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NLog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using TencentCloud.Common;
using TencentCloud.Common.Profile;
using TencentCloud.Sms.V20190711;
using TencentCloud.Sms.V20190711.Models;

    public class SMS
    {
        static Logger log = LogManager.GetCurrentClassLogger();

        private static string secretId = "这里写腾讯云后台账号申请的secretId ，一串加密的";
        private static string secretKey = "这里写腾讯云后台账号申请的secretKey，一串加密的";
        private static string templateID = "申请的短信模板的ID，一串数字"
        private static string companyName = "这里写公司名称";
        private static string SdkAppid = "这里写腾讯云后台的SdkAppid ，一串数字";
        public static string Send(string PhoneNumber, out string code, out string receive)
        {
            string data = "";
            code = GenerateRandomCode(6);
            try
            {
                Credential cred = new Credential
                {
                    SecretId = secretId,
                    SecretKey = secretKey
                };
                ClientProfile clientProfile = new ClientProfile();
                HttpProfile httpProfile = new HttpProfile();
                httpProfile.Endpoint = ("sms.tencentcloudapi.com");
                clientProfile.HttpProfile = httpProfile;
                SmsClient client = new SmsClient(cred, "", clientProfile);
                SendSmsRequest req = new SendSmsRequest();
                req.PhoneNumberSet = new string[] { "+86" + PhoneNumber };
                req.TemplateID = templateID;
                req.Sign = companyName;
                req.TemplateParamSet = new string[] { code };
                req.SmsSdkAppid = SdkAppid;
                SendSmsResponse resp = client.SendSmsSync(req);
                string jsonResult = AbstractModel.ToJsonString(resp);
                receive = jsonResult;
                JObject jb = (JObject)JsonConvert.DeserializeObject(jsonResult);
                data = jb["SendStatusSet"][0]["Code"].ToString().ToLower();
            }
            catch (Exception ex)
            {
                receive = "";
                data = ex.Message;
                string error = ex.Message;
                log.Error("短信发送错误：" + ex.Message + "rn" + "详细错误：" + ex.ToString());
            }
            return data;
        }

        /// 

        /// 用GUID作种子生成理论上不重复的随机数作为验证码
        /// 
        /// 
        /// 
        private static string GenerateRandomCode(int length)
        {
            var result = new StringBuilder();
            for (var i = 0; i < length; i++)
            {
                var r = new Random(Guid.NewGuid().GetHashCode());
                result.Append(r.Next(0, 10).ToString());
            }
            string code = result.ToString();

            return code;
        }
    }

注意：验证码是要程序自己生成的，并作为参数传给，腾讯云短信api的，我这里设置了三个参数

PhoneNumber：手机号码，如果要发给多个，改为string数组即可。

code：out 传出生成的验证码，可以将手机号作为Key,手机号为value，存入缓存验证用户输入的验证码是否正确。

receive：out 传出参数 返回调用腾讯云API后返回的结果消息，有误异常等