利用短信猫发送短信

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.IO.Ports;
using System.Threading;
using System.Text.RegularExpressions;  //红色命名空间引用是必须的，分别是端口、线程和正则表达式

/// <summary>
///SMS 的摘要说明
/// </summary>
public class SMS
{
    public SMS()
   {
        //
       //TODO: 在此处添加构造函数逻辑
      //
    }

    /// <summary>  
    /// 将汉字转换为Unicode  
    /// </summary>  
    /// <param name="text">要转换的字符串</param>  
    /// <returns></returns>  
    public static string GBToUnicode(string text)
    {
        byte[] bytes = System.Text.Encoding.Unicode.GetBytes(text);
        string lowCode = "", temp = "";
        for (int i = 0; i < bytes.Length; i++)
        {
            if (i % 2 == 0)
            {
                temp = System.Convert.ToString(bytes[i], 16);//取出元素4编码内容（两位16进制）
                if (temp.Length < 2) temp = "0" + temp;
            }
            else
            {
                string mytemp = Convert.ToString(bytes[i], 16);
                if (mytemp.Length < 2) mytemp = "0" + mytemp; lowCode = lowCode + mytemp + temp;//取出元素4编码内容（两位16进制）
            }
        }
        return lowCode;
    }

    #region 发送短息

        /// <summary>
        /// SendMessage函数用于发送短信.参数strMobileNumber设置手机号码，strMsgContent指
        /// 定要发送的内容
        /// </summary>
        /// <param name="strMobileNumber">手机号码</param>
        /// <param name="strMsgContent">要发送的内容</param>
        /// <returns> 返回指示发送是否成功</returns>
        public bool SendMessage(string strMobileNumber,string strMsgContent)
        {

            //查看机器可用的COM端口，如果COM1已经被占用的话，请选择其他端口
            SerialPort serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);  //端口的一些参数
            serialPort.WriteTimeout = 2000;
            try
            {
                serialPort.ReadBufferSize = 900000;
                if (serialPort.IsOpen) serialPort.Close();
                serialPort.Open();
                serialPort.WriteLine("ATZ/r");
                Thread.Sleep(500);
                serialPort.ReadExisting();
                serialPort.WriteLine("AT+CSMP=1,167,0,8" + "/r"); //短息消息格式
                serialPort.Write("AT+CMGS=" + strMobileNumber + "/r"); //发送短信AT指令
                Thread.Sleep(1000);
                string content = GBToUnicode(strMsgContent);
                serialPort.Write(content + Convert.ToChar(26).ToString()); //Ctrl+Z的ASCII编码值
                Thread.Sleep(2000);
                string msg = serialPort.ReadExisting();
                serialPort.Close();
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return false;
            }
            finally
            {
                //保证操作完成以后关闭端口，避免占用
                if (serialPort.IsOpen)
                    serialPort.Close();
            }
        }
    #endregion
}

前台页面aspx：

<table width="100%" border="0" cellspacing="0" cellpadding="0">
                                    <tr>
                                        <td height="30" align="right" bgcolor="#f2f2f2" class="left_txt2">
                                            手机号码：
                                        </td>
                                        <td height="30" bgcolor="#f2f2f2">
                                            <asp:TextBox ID="tbPhoneNum" runat="server"></asp:TextBox>
                                            &nbsp;
                                        </td>
                                        <td height="30" bgcolor="#f2f2f2" class="left_txt">
                                        </td>
                                    </tr>
                                    <tr>
                                        <td height="30" align="right" bgcolor="#f2f2f2" class="left_txt2">
                                            短信内容：
                                        </td>
                                        <td height="30" bgcolor="#f2f2f2">
                                            <asp:TextBox ID="tbContent" runat="server" Height="69px" TextMode="MultiLine" Width="303px"></asp:TextBox>
                                            &nbsp;
                                        </td>
                                        <td height="30" bgcolor="#f2f2f2" class="left_txt">
                                        </td>
                                    </tr>
                                    <tr>
                                        <td colspan="3" align="center">
                                            <table width="100%" height="31" border="0" cellpadding="0" cellspacing="0" class="nowtable">
                                                <tr>
                                                    <td class="left_bt2">
                                                        <asp:Button ID="btnDX" runat="server" Text="发送短信" OnClick="btnDX_Click" />
                                                    </td>
                                                </tr>
                                            </table>
                                        </td>
                                    </tr>
                                </table>

#region 发送短信

    protected void btnSend_Click(object sender, EventArgs e)
    {       

        //获取手机号码与短信内容
        string cSendPhoneNum = tbPhoneNum.Text.Trim();
        string cSendContent = tbContent.Text.Trim();

        #region 利用短信猫发送短信

        SMS sms = new SMS();
        try
        {
            //正则表达式验证，验证手机号码是否格式正确
            string code = @"^(13[0-9]|15[0|3|6|7|8|9]|18[8|9])/d{8}$";
            if (Regex.IsMatch(cSendPhoneNum, code))
            {
                //对短信的长度进行控制
                if (cSendContent.Length == 0||cSendContent.Length > 200)
                {
                    ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('短信内容为空或太长!')</script>");
                    return ;
                }
                //手机号码格式正确
                if (sms.SendMessage(cSendPhoneNum, cSendContent))
                {
                    //短信发送成功
                    ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('短信发送成功...'); </script>");
                }
                else
                {
                    //短信发送成功
                    ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('短信发送失败...'); </script>");
                }
            }
            else
            {
                ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('手机号码格式错误,请检查...')</script>");
            }
        }
        catch (Exception ex)
        {
            ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('"+ex.Message+"')</script>");
        }

        #endregion

以上就是全部可用代码，并加以适当注释。

以下附注常用的AT指令表：