发送短信（string转换为JSON）

　　using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo1113
{
    public sealed class Program
    {
        public static void Main()
        {
            SmsMessage smsMessage = new SmsMessage();
            smsMessage.OpenId = "123";
            smsMessage.TempleaseId = "abc";
            smsMessage.MessageInfo = new List<MessageInfo> { new MessageInfo{
            Key="1",Value="q"
            },new MessageInfo{Key="2",Value="w"}};
            //Newtonsoft.Json
            string json = JsonConvert.SerializeObject(smsMessage);

SmsMessageDictionary smsMessageDictionary = new Program.SmsMessageDictionary();
            smsMessageDictionary.OpenId = "123";
            smsMessageDictionary.TempleaseId = "abc";

Dictionary<string, string> list = new Dictionary<string, string>();
            list.Add("d", "1");
            list.Add("d1", "13");
            list.Add("d2", "14");
            smsMessageDictionary.MessageInfo = list;
            Console.WriteLine("Json=" + json);
            Console.WriteLine("Json２=" + JsonConvert.SerializeObject(smsMessageDictionary));
            Console.ReadKey();

string sJson = JsonConvert.SerializeObject(smsMessage); //传入参数有误时，可能会出现"远程服务器返回错误: (500) 内部服务器错误。"的错误
            System.Text.UTF8Encoding encodeing = new UTF8Encoding();
            byte[] contentBytes = encodeing.GetBytes(sJson);
            try
            {
                HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri("http://。。。。。。。。。"));
                //增加下面两个属性即可  （防止出现“基础连接已经关闭: 接收时发生错误。”的错误）
                webRequest.KeepAlive = false;
                webRequest.ProtocolVersion = HttpVersion.Version10;
                //webRequest.Proxy = new WebProxy("url", 80);
                //webRequest.UserAgent = "Mozilla-Firefox-Spider(Wenanry)";
                webRequest.Method = "POST";
                //webRequest.ContentType = "application/json";
                webRequest.ContentType = "application/json";
                webRequest.Accept = "application/json";
                webRequest.ContentLength = sJson.Length;  //这边是JSON的长度
                using (Stream newStream = webRequest.GetRequestStream())
                {
                    newStream.Write(contentBytes, 0, contentBytes.Length);   //这边读取的是字节
                }
                //ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
                //HttpWebResponse res;
                //try
                //{
                //    res = (HttpWebResponse)webRequest.GetResponse();
                //}
                //catch (WebException ex)
                //{
                //    res = (HttpWebResponse)ex.Response;
                //}
                using (var response = (HttpWebResponse)webRequest.GetResponse())
                {
                    var stream = response.GetResponseStream();
                    using (var sr = new StreamReader(stream, Encoding.Default))
                    {
                        str = sr.ReadToEnd();
                    }
                    stream.Dispose();
                }
               // JObject jo = JObject.Parse(str);
              //  string err = jo["errCode"].ToString();

JObject jopdd = JObject.Parse(str);
                string err = jopdd["errorCode"].ToString();
                string errMsg = jopdd["errorMessage"].ToString();
            }
            catch (Exception e)
            {
                string aa = "aaa";
            }
        }

public class SmsMessageDictionary
        {
            public string OpenId { get; set; }
            public string TempleaseId { get; set; }
            public Dictionary<string, string> MessageInfo { get; set; }
        }
        public class SmsMessage
        {
            public string OpenId { get; set; }
            public string TempleaseId { get; set; }
            public List<MessageInfo> MessageInfo { get; set; }
        }

public class MessageInfo
        {
            public string Key { get; set; }
            public string Value { get; set; }
        }
    }
}