asp.net基于windows服务实现定时发送邮件的方法

//定义组件
private System.Timers.Timer time;
public int nowhour;
public int minutes;
public string sendTime;
public Thread th;
public string isOpen;//是否启用定时发送
public string strToEUser;
public static int index = -1;
public static ArrayList mulitaddress;
//服务开始
protected override void OnStart(string[] args)
{
  time = new System.Timers.Timer();
  time.Enabled = true;
  time.AutoReset = true;
  //定时执行方法
   time.Elapsed+=new System.Timers.ElapsedEventHandler(time_Elapsed);
    UserEmail toUser =new UserEmail();
    mulitaddress = GetMailAdressName();
   // LogHelper.SaveNote("当前索引的值" + index.ToString());
    Thread.Sleep(2000);
   time.Start();
}
public class LogHelper
{
  public static void SaveNote(string note)
  {
    FileStream stream = new FileStream(GetLogDirectory("Common") + DateTime.Now.ToString("yyyy-MM-dd") + ".txt", FileMode.Append, FileAccess.Write, FileShare.Delete | FileShare.ReadWrite);
    StreamWriter writer = new StreamWriter(stream, Encoding.UTF8);
    writer.WriteLine("================================================================");
    writer.WriteLine(string.Format("Note:/t{0}", note));
    writer.WriteLine(string.Format("DateTime:/t{0}/r/n/r/n",DateTime.Now.ToString()));
    stream.Flush();
    writer.Close();
    stream.Close();
    stream.Dispose();
    writer.Dispose();
  }
  public static void SaveNote(string note, string txtname)
  {
    FileStream stream = new FileStream(GetLogDirectory(txtname) + DateTime.Now.ToString("yyyy-MM-dd") + ".txt", FileMode.Append, FileAccess.Write, FileShare.Delete | FileShare.ReadWrite);
    StreamWriter writer = new StreamWriter(stream, Encoding.GetEncoding("gb2312"));
    writer.WriteLine("================================================================");
    writer.WriteLine(string.Format("Note:/t{0}", note));
    writer.WriteLine(string.Format("DateTime:/t{0}/r/n/r/n", DateTime.Now.ToString("yyyyMMddHHmmss")));
    stream.Flush();
    writer.Close();
    stream.Close();
    stream.Dispose();
    writer.Dispose();
  }
  public static void SaveException(Exception e)
  {
    SaveException(e, string.Empty);
  }
  public static void SaveException(Exception e, string memo)
  {
    FileStream stream = new FileStream(GetLogDirectory("Common") + DateTime.Now.ToString("yyyy-MM-dd") + ".txt", FileMode.Append, FileAccess.Write, FileShare.Delete | FileShare.ReadWrite);
    StreamWriter writer = new StreamWriter(stream);
    writer.WriteLine("================================================================");
    writer.WriteLine(string.Format("Memo:/t{0}", memo));
    writer.WriteLine(string.Format("DateTime:/t{0}", DateTime.Now.ToShortTimeString()));
    writer.WriteLine(string.Format("Message:/t{0}", e.Message));
    writer.WriteLine(string.Format("StackTrace:/r/n----------/r/n{0}/r/n----------/r/n/r/n/r/n", e.StackTrace));
    stream.Flush();
    writer.Close();
    stream.Close();
    stream.Dispose();
    writer.Dispose();
  }
  public static string GetLogDirectory(string category)
  {
    string baseDirectory = string.Empty;
    if ((HttpContext.Current != null) && (HttpContext.Current.Server != null))
    {
      baseDirectory = HttpContext.Current.Server.MapPath("~");
    }
    else
    {
      baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
    }
    if ((baseDirectory[baseDirectory.Length - 1] != '/') && (baseDirectory[baseDirectory.Length - 1] != '//'))
    {
      baseDirectory = baseDirectory + @"/";
    }
    baseDirectory = string.Format(@"{0}Log/{1}/", baseDirectory, category);
    if (!Directory.Exists(baseDirectory))
    {
      Directory.CreateDirectory(baseDirectory);
    }
    return baseDirectory;
  }
}
void time_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
  try
  {
    if (mulitaddress != null)
    {
      LogHelper.SaveNote("进入time_Elapsed");
      //获取定时发送时间
      sendTime = Convert.ToString(GetConfigValue("sendTime"));
      LogHelper.SaveNote("sendTime" + sendTime);
      //是否开启定时发送功能
      isOpen = GetConfigValue("isOpen");
      int sleeptime = Convert.ToInt32(GetConfigValue("SleepTime"));
      int stoptime = Convert.ToInt32(GetConfigValue("stoptime"));
      //LogHelper.SaveNote("数组长度" + mulitaddress.Count);
      // LogHelper.SaveNote("是否开启定时发送功能" + isOpen + "定时时间" + sendTime + "定时小时数:" + Convert.ToInt32(sendTime.Split(new char[] { ':' })[0]) + "定时分钟数:" + Convert.ToInt32(sendTime.Split(new char[] { ':' })[1]));
      if (isOpen == "true")
      {
        //现在时间 小时
        nowhour = Convert.ToInt32(DateTime.Now.Hour.ToString());//10
        //现在分钟
        minutes = Convert.ToInt32(DateTime.Now.Minute.ToString());//5
        //获取发送小时
        int sendhour = Convert.ToInt32(sendTime.Split(new char[] { ':' })[0]);
        //获取发送的分钟
        int sendMinute = Convert.ToInt32(sendTime.Split(new char[] { ':' })[1]);
        LogHelper.SaveNote("进入定时发送邮件服务! 定时小时为:" + sendhour.ToString() + "定时分钟为:" + sendMinute.ToString() + "现在小时为:" + nowhour.ToString() + "现在定时的分钟为:" + minutes.ToString());
        LogHelper.SaveNote("当前索引的值" + index.ToString());
        if (nowhour == stoptime)
        {
          LogHelper.SaveNote("停止时间点到了 邮件停止发送 ！！！");
          index = -1;
        }
        else
        {
          //如果和当前的时间 小时相等 则定时发送邮件
          if ((Convert.ToDateTime(DateTime.Now.ToShortTimeString()) >= Convert.ToDateTime(sendTime)) && index < mulitaddress.Count)
          {
            index++;
            if (index < mulitaddress.Count)
            {
              SendEmail(((UserEmail)mulitaddress[index]));
            }
            else
            {
              LogHelper.SaveNote("发送完毕 当前的索引值为" + index.ToString());
            }
          }
        }
      }
      else
      {
        //LogHelper.SaveNote("当前索引的值" + index.ToString());
        index++;
        if (index < mulitaddress.Count)
        {
          SendEmail(((UserEmail)mulitaddress[index]));
        }
        else
        {
          LogHelper.SaveNote("发送完毕 时间停止");
          time.Enabled = false;
          time.Stop();
        }
      }
      Thread.Sleep(sleeptime);
    }
    else
      LogHelper.SaveNote("mulitaddress=null");
  }
  catch (Exception ex) 
  {
    LogHelper.SaveNote(ex.ToString());
  }
}
public ArrayList GetMailAdressName()
{
  ArrayList list = new ArrayList();
  string strSQL = "select b.mailAddress, a.mailtemplate,a.title from tg_product as a inner join tg_mailOrder as b on a.ccode=b.ccode where a.createtime=(select max(createtime) from tg_product)";
  SqlDataReader dr = SqlHelper.ExecuteReader(CommandType.Text, strSQL, null);
  if (dr.HasRows)
  {
    while (dr.Read())
    {
      UserEmail email = new UserEmail();
      email.Mailaddres = dr["mailAddress"].ToString();
      email.Title = dr["title"].ToString();
      email.Contents = dr["mailtemplate"].ToString();
      list.Add(email);
    }
  }
  return list;
}
/// <summary>
/// 定义用户邮件 标题 内容 Email地址
/// </summary>
public class UserEmail {
  private string title;
  private string contents;
  public string Contents
  {
    get { return contents; }
    set { contents = value; }
  }
  private string mailaddres;
  public string Mailaddres
  {
    get { return mailaddres; }
    set { mailaddres = value; }
  }
  public string Title { 
  get{return title;}
    set { title = value; }
  }
}
#region 发送邮件
/// <summary>
/// 发送邮件
/// </summary>
public void SendEmail(UserEmail user)
{
  try
  {
    LogHelper.SaveNote("进入SendEmail!!!");
    //邮件服务器
    string smtpserver = GetConfigValue("smtpserver");
    //发件人的邮箱名称
    string emailuserName = GetConfigValue("emailuserName");
    //发件人的邮箱密码
    string emailuserpwd = GetConfigValue("emailuserpwd");
    //邮箱地址
    string emailfrom = GetConfigValue("emailfrom");
    int port = Convert.ToInt32(GetConfigValue("serverPort"));
    bool f = true;
    //是否经过SSL加密
    string isSSL = GetConfigValue("SSL");
    if (isSSL == "true")
    {
      f = true;
    }
    else
    {
      f = false;
    }
    LogHelper.SaveNote("发件人的邮箱名称" + emailuserName + "邮件地址(emailFrom)" + emailfrom + "收件人" + user.Mailaddres);
    SendEmailToUser(smtpserver, port, f, user.Mailaddres, null, emailuserName, emailuserpwd, emailfrom, user.Title,user.Contents);
    LogHelper.SaveNote("Send Mail Success");
  }
  //获取异常信息
  catch (Exception error)
  {
    //写入异常信息
    using (StreamWriter sw = new StreamWriter("F://MailErrorlog.txt", true, System.Text.Encoding.UTF8))
    {
      sw.WriteLine(DateTime.Now.ToString() + "：");
      sw.WriteLine("Exception 异常信息如下.................");
      sw.WriteLine(error.ToString());
      sw.WriteLine("---------------------------------------------");
      sw.Close();
    }
  }
}
#endregion
#region 利用.Net自带类(SmtpClient) 发送邮件
/// <summary>
/// 利用.Net自带类(SmtpClient) 发送邮件
/// </summary>
/// <param name="stmpserver">邮件服务器</param>
/// <param name="username">用户名(邮箱名称)</param>
/// <param name="pwd">密码</param>
/// <param name="f">是否经过SSL加密</param>
/// <param name="port">邮件服务器端口(没有加密 一般都是25)</param>
/// <param name="strfrom">发件人</param>
/// <param name="strto">收件人</param>
/// <param name="subject">主题</param>
/// <param name="body">内容</param>
/// <param name="Mulitaddress">发送多人 收件人的邮箱地址以逗号隔开</param>
/// <param name="attachmentName">发送的附件名称 没有附件则为null or ""</param>
public void SendEmailToUser(string stmpserver,int port,bool f, string Mulitaddress, string attachmentName, string username, string pwd, string strfrom, string subject, string body)
{
  string ErrorLog = GetConfigValue("ErrorLog");
  SmtpClient smtp = new SmtpClient();
  //发送邮件的方式
  smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
  //指定邮件服务器
  smtp.Host = stmpserver;
  //Gmail QQ stmp ssl加密使用的端口 
  smtp.Port = port;
  smtp.EnableSsl = f; ;//true 经过ssl加密 
  //验证发件人的身份 用户名(邮件地址和密码)
  smtp.Credentials = new System.Net.NetworkCredential(username, pwd);
  //初始化信息(来自 接收人)
  MailMessage _mailmessage = new MailMessage();
  //_mailmessage.To = strto;
  //发送多个人 接收人邮件地址以,隔开
  _mailmessage.From = new MailAddress(strfrom);
  _mailmessage.To.Add(Mulitaddress);
  //如果发送失败，SMTP 服务器将发送 失败邮件通知
  _mailmessage.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
  //优先级
  _mailmessage.Priority = MailPriority.High;
  //发送主题
  _mailmessage.Subject = subject;
  //有附件则添加附件
  if (!string.IsNullOrEmpty(attachmentName))
  {
    System.Net.Mail.Attachment attch = new System.Net.Mail.Attachment(attachmentName);
    _mailmessage.Attachments.Add(attch);
  }
  //邮件主题编码
  _mailmessage.SubjectEncoding = System.Text.Encoding.UTF8;
  //指定发送的格式 (Html)
  _mailmessage.IsBodyHtml = true;
  //指定发送邮件的编码
  _mailmessage.BodyEncoding = System.Text.Encoding.UTF8;
  //指定邮件内容
  _mailmessage.Body = body;
  //发送邮件
  try
  {
    smtp.Send(_mailmessage);
  }
  catch (Exception ex)
  {
    using (StreamWriter writer = new StreamWriter(ErrorLog+"://MailErrorlog.txt", true, System.Text.Encoding.UTF8))
    {
      writer.WriteLine("---------------------------------------------");
      writer.WriteLine("SendEmail方法发送邮件错误日志................");
      writer.WriteLine(ex.ToString());
      writer.Flush();
      writer.Close();
    }
  }
}
#endregion
#region 获取邮件配置节点的值
/// <summary>
/// 加载相应配置文件 并按节点名称获取对应的值
/// </summary>
/// <param name="target">当前节点的名称</param>
/// <returns>返回当前节点名称所对应的值</returns>
public string GetConfigValue(string target)
{
  string configpath=System.Windows.Forms.Application.StartupPath.ToString() + "/Email.config";
  return GetConfigValue(configpath, target);
}
/// <summary>
/// 根据节点名称获取配置文件对应的值(邮件配置信息)
/// </summary>
/// <param name="configpath">配置文件路径</param>
/// <param name="target">要获取配置节点的名称</param>
/// <returns>返回当前节点名称所对应的值</returns>
public string GetConfigValue(string configpath, string target)
{
  XmlDocument doc = new XmlDocument();
  //加载文件路径s
  doc.Load(configpath);
  //获取当前节点的根节点
  XmlElement root = doc.DocumentElement;
  //获取当前节点下所有匹配子节点元素
  XmlNodeList xmlnode = root.GetElementsByTagName(target);
  //返回值
  return xmlnode[0].InnerXml;
}
#endregion
//服务结束
protected override void OnStop()
{
  time.Enabled = false;
}

<?xml version="1.0" encoding="utf-8"?>
<Emailconfig>
 <!--邮件服务器地址 Gmail stmp.gmail.com-->
 <smtpserver>*****</smtpserver>
 <!--邮箱用户名 -->
 <emailuserName>***</emailuserName>
 <!--邮箱密码-->
 <emailuserpwd>****</emailuserpwd>
 <!--邮箱地址-->
 <emailfrom>*****</emailfrom>
 <!--是否启用定时发送邮件功能-->
 <isOpen>true</isOpen>
 <!--前提下isOpen为true 定在每天某个时间点发送邮件-->
 <sendTime>8:53</sendTime>
  <!--是否经过SSL加密-->
  <SSL>false</SSL>
 <!--Gmail smtp SSL加密 (Gmail:587) 服务器端口(没有加密(SSL 配置为false) 一般都是25
(163,qq))-->
 <serverPort>25</serverPort>
 <!--线程睡眠时间-->
 <SleepTime>1000</SleepTime>
 <!--定停发送时间-->
 <stoptime>0</stoptime>
 <!--发送邮件错误日志路径 盘根目录-->
 <ErrorLog>E</ErrorLog>
 <!--定义数据库连接字符串-->
 <Connstr></Connstr>
</Emailconfig>

#region 数据库操作类的封装
public abstract class SqlHelper
{
  //Database connection strings
  public static readonly string ConnectionStringLocalTransaction = Connstr;
  // Hashtable to store cached parameters
  private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
  /*返回数据库连接*/
  public static SqlConnection getConnection()
  {
    SqlConnection c = new SqlConnection(ConnectionStringLocalTransaction);
    return c;
  }
  /// <summary>
  /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  /// SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">a valid connection string for a SqlConnection</param>
  /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">the stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the results</returns>
  public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
  {
    SqlCommand cmd = new SqlCommand();
    SqlConnection conn = new SqlConnection(connectionString);
    // we use a try/catch here because if the method throws an exception we want to 
    // close the connection throw code, because no datareader will exist, hence the 
    // commandBehaviour.CloseConnection will not work
    try
    {
      PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
      SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
      cmd.Parameters.Clear();
      return rdr;
    }
    catch
    {
      conn.Close();
      throw;
    }
  }
  public static DataSet ReturnDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
  {
    SqlCommand cmd = new SqlCommand();
    SqlConnection conn = new SqlConnection(ConnectionStringLocalTransaction);
    // we use a try/catch here because if the method throws an exception we want to 
    // close the connection throw code, because no datareader will exist, hence the 
    // commandBehaviour.CloseConnection will not work
    try
    {
      PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
      DataSet ds = new DataSet();
      SqlDataAdapter sda = new SqlDataAdapter(cmd);
      sda.Fill(ds);
      return ds;
    }
    catch
    {
      conn.Close();
      throw;
    }
  }
  /// <summary>
  /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  /// SqlDataReader r = ExecuteReader(SqlConnection, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">a valid connection string for a SqlConnection</param>
  /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">the stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the results</returns>
  public static SqlDataReader ExecuteReader(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
  {
    SqlCommand cmd = new SqlCommand();
    // we use a try/catch here because if the method throws an exception we want to 
    // close the connection throw code, because no datareader will exist, hence the 
    // commandBehaviour.CloseConnection will not work
    try
    {
      PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
      SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
      cmd.Parameters.Clear();
      return rdr;
    }
    catch
    {
      conn.Close();
      throw;
    }
  }
  /// <summary>
  /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  /// SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">a valid connection string for a SqlConnection</param>
  /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">the stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the results</returns>
  public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
  {
    SqlCommand cmd = new SqlCommand();
    SqlConnection conn = new SqlConnection(ConnectionStringLocalTransaction);
    // we use a try/catch here because if the method throws an exception we want to 
    // close the connection throw code, because no datareader will exist, hence the 
    // commandBehaviour.CloseConnection will not work
    try
    {
      PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
      SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
      cmd.Parameters.Clear();
      return rdr;
    }
    catch
    {
      conn.Close();
      throw;
    }
  }
  /// <summary>
  /// add parameter array to the cache
  /// </summary>
  /// <param name="cacheKey">Key to the parameter cache</param>
  /// <param name="cmdParms">an array of SqlParamters to be cached</param>
  public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
  {
    parmCache[cacheKey] = commandParameters;
  }
  /// <summary>
  /// Retrieve cached parameters
  /// </summary>
  /// <param name="cacheKey">key used to lookup parameters</param>
  /// <returns>Cached SqlParamters array</returns>
  public static SqlParameter[] GetCachedParameters(string cacheKey)
  {
    SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
    if (cachedParms == null)
      return null;
    SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
    for (int i = 0, j = cachedParms.Length; i < j; i++)
      clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
    return clonedParms;
  }
  /// <summary>
  /// Prepare a command for execution
  /// </summary>
  /// <param name="cmd">SqlCommand object</param>
  /// <param name="conn">SqlConnection object</param>
  /// <param name="trans">SqlTransaction object</param>
  /// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
  /// <param name="cmdText">Command text, e.g. Select * from Products</param>
  /// <param name="cmdParms">SqlParameters to use in the command</param>
  private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
  {
    if (conn.State != ConnectionState.Open)
      conn.Open();
    cmd.Connection = conn;
    cmd.CommandText = cmdText;
    if (trans != null)
      cmd.Transaction = trans;
    cmd.CommandType = cmdType;
    if (cmdParms != null)
    {
      foreach (SqlParameter parm in cmdParms)
        cmd.Parameters.Add(parm);
    }
  }
  /// <summary>
  /// 传入输入参数
  /// </summary>
  /// <param name="ParamName">存储过程名称</param>
  /// <param name="DbType">参数类型</param></param>
  /// <param name="Size">参数大小</param>
  /// <param name="Value">参数值</param>
  /// <returns>新的 parameter 对象</returns>
  public static SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value)
  {
    return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
  }
  public void MakeInParam(ref string OldString, string ParamName, SqlDbType DbType, int Size, object Value)
  {
    OldString = OldString.Replace(ParamName, (string)Value);
  }
  /// <summary>
  /// 传入返回值参数
  /// </summary>
  /// <param name="ParamName">存储过程名称</param>
  /// <param name="DbType">参数类型</param>
  /// <param name="Size">参数大小</param>
  /// <returns>新的 parameter 对象</returns>
  public static SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size)
  {
    return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
  }
  /// <summary>
  /// 传入返回值参数
  /// </summary>
  /// <param name="ParamName">存储过程名称</param>
  /// <param name="DbType">参数类型</param>
  /// <param name="Size">参数大小</param>
  /// <returns>新的 parameter 对象</returns>
  public static SqlParameter MakeReturnParam(string ParamName, SqlDbType DbType, int Size)
  {
    return MakeParam(ParamName, DbType, Size, ParameterDirection.ReturnValue, null);
  }
  /// <summary>
  /// 生成存储过程参数
  /// </summary>
  /// <param name="ParamName">存储过程名称</param>
  /// <param name="DbType">参数类型</param>
  /// <param name="Size">参数大小</param>
  /// <param name="Direction">参数方向</param>
  /// <param name="Value">参数值</param>
  /// <returns>新的 parameter 对象</returns>
  public static SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
  {
    SqlParameter param;
    if (Size > 0)
      param = new SqlParameter(ParamName, DbType, Size);
    else
      param = new SqlParameter(ParamName, DbType);
    param.Direction = Direction;
    if (!(Direction == ParameterDirection.Output && Value == null))
      param.Value = Value;
    return param;
  }
  /// <summary>
  /// 创建 SqlCommand 对象实例(用来返回一个整数值)    
  /// </summary>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <returns>SqlCommand 对象实例</returns>
  private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
  {
    SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
    command.Parameters.Add(new SqlParameter("ReturnValue",
      SqlDbType.Int, 4, ParameterDirection.ReturnValue,
      false, 0, 0, string.Empty, DataRowVersion.Default, null));
    return command;
  }
  /// <summary>
  /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
  /// </summary>
  /// <param name="connection">数据库连接</param>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <returns>SqlCommand</returns>
  private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
  {
    SqlCommand command = new SqlCommand(storedProcName, connection);
    command.CommandType = CommandType.StoredProcedure;
    foreach (SqlParameter parameter in parameters)
    { 
      command.Parameters.Add(parameter);
    }
    return command;
  }
  #region 执行查询语句 返回dataset
  /// <summary>
  /// 执行查询语句，返回DataSet
  /// </summary>
  /// <param name="cmdText">查询语句</param>
  /// <returns>DataSet</returns>
  public static DataSet GetDataSet(string cmdText)
  {
    using (SqlConnection conn = new SqlConnection(ConnectionStringLocalTransaction))
    {
      SqlCommand sqlcmd = new SqlCommand(cmdText, conn);
      sqlcmd.CommandTimeout = 1000;
      SqlDataAdapter cmd = new SqlDataAdapter(sqlcmd);
      DataSet ds = new DataSet();
      try
      {
        conn.Open();
        cmd.Fill(ds, "mydt");
        return ds;
      }
      catch (Exception ex)
      {
        conn.Close();
        cmd.Dispose();
        conn.Dispose();
        throw new Exception(ex.Message);
      }
      finally
      {
        cmd.Dispose();
        conn.Close();
        conn.Dispose();
      }
    }
  }
  #endregion
}
#endregion