C# 实现发送手机短信

现在很多网站都是短信发送的功能，怎么实现的呢。对于个人站长来说的话，通过使用SMS短信通API接口相对比较划算和简单。那怎么实现呢，步骤如下：

1. 从网上（http://sms.webchinese.cn/）申请账号，记住用户名，密码会发到手机上，这仅是登陆密码。注册后会送5条短信、和3条彩信的发送量。

2.查看SMS短信通API下行接口（http://sms.webchinese.cn/api.shtml），然后获取秘钥，其实就是加密后的登录密码。开始敲代码，相关代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace WindowsForm
{
    public partial class Form9 : Form
    {
        private string THE_UID = "dourong"; //用户名
        private string THE_KEY = "f891aefbdbfac7a3da9f"; //接口秘钥
        public Form9()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string number = textBox1.Text;
            string smsText = textBox2.Text;
            string PostUrl = GetPostUrl(number,smsText);

            string result = PostSmsInfo(PostUrl);

            string t = GetResult(result);
        }
        /// 
返回UTF-8编码发送接口地址
        /// 目的手机号码（多个手机号请用半角逗号隔开）
        /// 短信内容，最多支持400个字，普通短信70个字/条，长短信64个字/条计费
        /// 
        public string GetPostUrl(string smsMob, string smsText)
        {
            string postUrl = "http://utf8.api.smschinese.cn/?Uid=" + THE_UID + "&key=" + THE_KEY + "&smsMob=" + smsMob + "&smsText=" + smsText;
            return postUrl;
        }
        /// 

        /// 发送短信，得到返回值
        /// 
        /// 
        /// 
        public string PostSmsInfo(string url)
        {
            //调用时只需要把拼成的URL传给该函数即可。判断返回值即可
            string strRet = null;

            if (url == null || url.Trim().ToString() == "")
            {
                return strRet;
            }
            string targeturl = url.Trim().ToString();
            try
            {
                HttpWebRequest hr = (HttpWebRequest)WebRequest.Create(targeturl);
                hr.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";
                hr.Method = "GET";
                hr.Timeout = 30 * 60 * 1000;
                WebResponse hs = hr.GetResponse();
                Stream sr = hs.GetResponseStream();
                StreamReader ser = new StreamReader(sr, Encoding.Default);
                strRet = ser.ReadToEnd();
            }
            catch (Exception ex)
            {
                strRet = null;
            }
            return strRet;
        }
        /// 

        /// 确认返回信息 
        /// 
        /// 
        /// 
        public string GetResult(string strRet)
        {
            int result = 0;
            try
            {
                result = int.Parse(strRet);
                switch (result)
                {
                    case -1:
                        strRet = "没有该用户账户";
                        break;
                    case -2:
                        strRet = "接口密钥不正确,不是账户登陆密码";
                        break;
                    case -21:
                        strRet = "MD5接口密钥加密不正确";
                        break;
                    case -3:
                        strRet = "短信数量不足";
                        break;
                    case -11:
                        strRet = "该用户被禁用";
                        break;
                    case -14:
                        strRet = "短信内容出现非法字符";
                        break;
                    case -4:
                        strRet = "手机号格式不正确";
                        break;
                    case -41:
                        strRet = "手机号码为空";
                        break;
                    case -42:
                        strRet = "短信内容为空";
                        break;
                    case -51:
                        strRet = "短信签名格式不正确,接口签名格式为：【签名内容】";
                        break;
                    case -6:
                        strRet = "IP限制";
                        break;
                    default:
                        strRet = "发送短信数量：" + result;
                        break;
                }
            }
            catch (Exception ex)
            {
                strRet = ex.Message;
            }
            return strRet;
        }
    }
}

3. 找在线客服开通发送权限，填写好签名，效果图如下：