秒滴api发送短信

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Net.Http;
using System.Security.Cryptography;//md5需要引入的命名空间
namespace WebApplication1.Controllers
{
    public class SendMessagesController : Controller
    {
        // GET: SendMessages
        public ActionResult Index()
        {         
            return View();
        }
        [HttpPost]
        public  JsonResult SendMessages(string tel)
        {
            string accountSid = "";//开发者主账号ID（ACCOUNT SID）
            string token = "";//开发者token
            string timestamp = DateTime.Now.ToString("yyyyMMddHHmmss");//时间戳  yyyyMMddHHmmss  5分钟内有效
            //随机生成验证码
            Random rd = new Random();
            string num = rd.Next(1000, 10000).ToString();
            //模仿浏览器访问：            
            HttpClient hc = new HttpClient();

            List> keylist = new List>()
            {
                new KeyValuePair("accountSid",accountSid),
                //new KeyValuePair("smsContent",""),// 短信内容。（smsContent与templateid必须填写一项）
                new KeyValuePair("templateid","89356984"),//短信模板ID 
                new KeyValuePair("param",num+",5"),//短信变量  可选
                new KeyValuePair("to",tel),//收端手机号码集合。用英文逗号分开
                new KeyValuePair("timestamp",timestamp),
                new KeyValuePair("sig",Md5(accountSid+token+timestamp).ToLower()),//MD5(ACCOUNT SID + AUTH TOKEN + timestamp)小写
                new KeyValuePair("respDataType","JSON"),//可选，默认为json  可以为xml
            };
            //请求参数
            HttpContent hct = new FormUrlEncodedContent(keylist);          
            HttpResponseMessage hrm =  hc.PostAsync("https://api.miaodiyun.com/20150822/industrySMS/sendSMS", hct).Result;

            return Json(hrm.Content.ReadAsStringAsync().Result);
        }


        /// 

        /// md5加密
        /// 
        /// 要加密的内容
        /// 
        public static string Md5(string str)
        {
            //把字符串转化为字节数组
            byte[] before_bytestr = System.Text.Encoding.Default.GetBytes(str);
            MD5 md5 = new MD5CryptoServiceProvider();
            //通过字节数组转化为加密后的字节数组(hash编码值)
            byte[] after_bytestr = md5.ComputeHash(before_bytestr);
            //加密后的字节数组转化成字符串
            string md5str = BitConverter.ToString(after_bytestr).Replace("-", "");
            return md5str;
        }
    }
}

@{
    ViewBag.Title = "Index";
}