我有窗口服务应用程序每 10 秒发送一次电子邮件，但我想在特定日期发送。我只想在那一天发送一次/一封电子邮件。我需要将我的 10 秒更改为 1 天吗？或者还有其他方法。
代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Web;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using MySql.Data;
using MySql.Data.MySqlClient;
namespace TestWS
{
public partial class MyNewService : ServiceBase
{
private string from_email = "dcaquino@trends.com.ph";
private string to_email = "dcaquino@trends.com.ph";
//private string cc_email = "dcaquino@trends.com.ph";
System.Timers.Timer timer = new System.Timers.Timer();
public MyNewService()
{
InitializeComponent();
this.CanStop = true;
this.CanPauseAndContinue = true;
}
protected override void OnStart(string[] args)
{
timer.Stop();
timer.Elapsed += new System.Timers.ElapsedEventHandler(sendmail);
timer.Interval = 10000; // 15 min
timer.Enabled = true;
timer.AutoReset = true;
timer.Start();
//timer.Enabled = true;
//timer.Interval = 10000;
//timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
}
protected override void OnStop()
{
}
//--------TIMER----//
protected void timer_Elapsed(object source, System.Timers.ElapsedEventArgs aa)
{
check_contract();
}
//---------SEND EMAIL AND CHECK FOR THE CONTRACT END DATE-------//
private void check_contract()
{
string constring = "server=localhost;user=root;database=scms;port=3306;password=;";
MySqlConnection conn = new MySqlConnection(constring);
conn.Open();
string query = "select a.contract_end,a.contract_id,b.title from contracts a join clients b on a.client_id = b.id";
MySqlCommand cmd1 = new MySqlCommand(query, conn);
MySqlDataAdapter ad1 = new MySqlDataAdapter(cmd1);
DataTable dt1 = new DataTable();
ad1.Fill(dt1);
string querycount = "select count(contract_end) from contracts";
MySqlCommand cmd2 = new MySqlCommand(querycount, conn);
MySqlDataAdapter ad2 = new MySqlDataAdapter(cmd2);
DataTable dt2 = new DataTable();
ad2.Fill(dt2);
int count_dates = Convert.ToInt16(dt2.Rows[0][0].ToString());
for (int i = 0; i < count_dates; i++)
{
DateTime c_end = Convert.ToDateTime(dt1.Rows[i][0]);
DateTime c_end_30 = c_end.AddDays(-30);
DateTime c_end_15 = c_end.AddDays(-15);
DateTime c_end_10 = c_end.AddDays(-10);
string c_id = Convert.ToString(dt1.Rows[i][1]);
string client_name = Convert.ToString(dt1.Rows[i][2]);
string format = "MMMM dd, yyyy";
string date_expired = Convert.ToDateTime(dt1.Rows[i][0]).ToString(format);
if (c_end_30 == DateTime.Today)
{
sendemail(c_id, client_name, date_expired,"30 Days");
}
else if(c_end_15 == DateTime.Today)
{
sendemail(c_id, client_name, date_expired, "15 Days");
}
else if (c_end_10 == DateTime.Today)
{
sendemail(c_id, client_name, date_expired, "10 Days");
}
}
conn.Close();
}
private void sendemail(string c_id, string client_name, string date_expired,string days_remain)
{
SmtpClient smtpClient = new SmtpClient();
using (MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress(from_email);
MailAddress toAddress = new MailAddress(to_email);
//MailAddress ccAddress = new MailAddress(ccAddress);
message.From = fromAddress;
message.To.Add(toAddress);
//message.CC.Add(ccAddress);
message.Subject = "Contract Expiration -SCMS";
message.IsBodyHtml = true;
message.Body = "Hello Account Manager, <br /> <br /> <br />" +
"Contract will expired on " + date_expired +
"<br /><br />Days Remaining: " + days_remain +
"<br /><br />Contract Number: " + c_id +
"<br /><br />Client Name: " + client_name +
"<br /><br /><br /><br />Please prepare for necessary steps to update the client for renewal of contract. <br/>" +
"<br /><br /><br />Message from SCMS";
smtpClient.Host = "10.10.20.20";
smtpClient.Port = 25;
smtpClient.Credentials = new System.Net.NetworkCredential("dcaquino@trends.com.ph", "@dca12345");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
}
}
}