c#widows服务生成exel文件并发送邮件

这周组织上给安排个小活，做个windows服务定时从数据库中查询出数据并发送邮件给相关人员。在生成excel文件的时候，编码是个问题，在这块折腾了好半天。

另外，很少做windows服务，对它的调试也缺乏经验，一开始就是写日志的方式来调试，后来，看网上哥们说，附件进程就可以调试，小试一把啊，果然爽的不亦乐乎啊。

其实，这东西很简单，就是很少做不熟悉而已啊，还是写出来，方便以后查阅吧。

首先，要建一windows服务项目，而后把项目名称叫做SendMailService，把Service1改名为MailService。另外，要在服务上拖一timer组件，一定是System.Timers.Timer

这个。点工具箱右键选择“选择项...”出现如图界面

点确定后，就可以拖到服务设计界面了。右键timer1修改一些属性，改名为mailTimer，设置Interval属性，这里我设置1分钟60000。

而后双击timer，自动生成mailTimer_Elapsed()方法，查看MailService.Designer.cs自动生成的代码如下

 /// <summary> 
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.mailTimer = new System.Timers.Timer();
            ((System.ComponentModel.ISupportInitialize)(this.mailTimer)).BeginInit();
            // 
            // mailTimer
            // 
            this.mailTimer.Enabled = true;
            this.mailTimer.Interval = 60000;
            this.mailTimer.Elapsed += new System.Timers.ElapsedEventHandler(this.mailTimer_Elapsed);
            // 
            // MailService
            // 
            this.ServiceName = "MailService";
            ((System.ComponentModel.ISupportInitialize)(this.mailTimer)).EndInit();

        }

整个MailService的方法如下，

 public MailService()
        {
            InitializeComponent();
            this.ServiceName = "MailService";
            this.EventLog.Source = "MailService";
            this.EventLog.Log = "Application";

            this.CanShutdown = true;
            this.CanStop = true;
            if (!EventLog.SourceExists("MailService"))
                EventLog.CreateEventSource("MailService", "Application");
        }

        protected override void OnStart(string[] args)
        {
            this.mailTimer.Enabled = true;
        }

        protected override void OnStop()
        {
            this.mailTimer.Enabled = false;
        }

        private void mailTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            new SendMailData().DeliveryMail();
        }

写了个简单的方法发送同步右键，整个类的代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.IO;


namespace SendMailService
{
    public class SimpleSendMail
    {
        public static void SendMail(string to, string from, string fromPassword, string subject, string body, bool isHtmlBody
                                                  , string attaFilePaths)
        {
            try
            {
                MailMessage message = new MailMessage(from, to, subject, body);
                message.BodyEncoding = Encoding.UTF8;
                message.IsBodyHtml = isHtmlBody;
                foreach (string path in attaFilePaths.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
                {
                    if (!string.IsNullOrEmpty(path) && File.Exists(path))
                    {
                        message.Attachments.Add(new Attachment(path));
                    }
                }
                SmtpClient smtpClient = new SmtpClient();
                smtpClient.Host = "smtp." + message.From.Host;
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials = new NetworkCredential(from, fromPassword);
                smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtpClient.Send(message);
            }
            catch (Exception ex)
            {
                throw new Exception("邮件发送失败！错误信息：" + ex.Message);
            }
        }
    }
}

下面就是让我小费事的保存excel问题，编码问题害死人啊，整个类的代码如下

 public class SendMailData
    {
        public void DeliveryMail()
        {
            SaveExcel(GetData());
            SimpleSendMail.SendMail("接收邮箱", "发送邮箱", "发送邮箱密码", "简单邮件测试", "简单邮件测试", true,
             @"E:\MailData\Data.xls");
        }
        private DataTable GetData()
        {
            string strSQL = "查询语句";
            return "执行结果";
        }
        private void SaveExcel(DataTable dt)
        {
            using (FileStream fs = new FileStream(@"E:\MailData\Data.xls", FileMode.OpenOrCreate))
            {
                using (StreamWriter sw = new StreamWriter(fs, Encoding.Unicode))
                {
                    string columns = string.Empty;
                    string rowData = string.Empty;
                    foreach (DataColumn column in dt.Columns)
                    {
                        columns += column.Caption + "\t";
                    }
                    columns += "\n";
                    sw.Write(columns);
                    foreach (DataRow row in dt.Rows)
                    {
                        foreach (DataColumn column in dt.Columns)
                        {
                            rowData += row[column.Caption].ToString() + "\t";
                        }
                        rowData += "\n";
                    }

                    sw.Write(rowData);
                    sw.Flush();
                }
            }
        }

    }