我需要通过我的C#app发送电子邮件.
我来自VB 6背景,并且在MAPI控件方面有很多不好的经历.首先,MAPI不支持HTML电子邮件,其次,所有电子邮件都发送到我的默认邮件发件箱.所以我仍然需要点击发送接收.
如果我需要发送批量html身体电子邮件(100 - 200),那么在C#中执行此操作的最佳方式是什么？
提前致谢.
您可以使用.NET框架的System.Net.Mail.MailMessage类.
您可以在此处找到MSDN文档.
这是一个简单的例子(代码片段):
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
...
try
{
SmtpClient mySmtpClient = new SmtpClient("my.smtp.exampleserver.net");
// set smtp-client with basicAuthentication
mySmtpClient.UseDefaultCredentials = false;
System.Net.NetworkCredential basicAuthenticationInfo = new
System.Net.NetworkCredential("username", "password");
mySmtpClient.Credentials = basicAuthenticationInfo;
// add from,to mailaddresses
MailAddress from = new MailAddress("test@example.com", "TestFromName");
MailAddress to = new MailAddress("test2@example.com", "TestToName");
MailMessage myMail = new System.Net.Mail.MailMessage(from, to);
// add ReplyTo
MailAddress replyto = new MailAddress("reply@example.com");
myMail.ReplyToList.Add(replyTo);
// set subject and encoding
myMail.Subject = "Test message";
myMail.SubjectEncoding = System.Text.Encoding.UTF8;
// set body-message and encoding
myMail.Body = "Test Mail
using HTML.";
myMail.BodyEncoding = System.Text.Encoding.UTF8;
// text or html
myMail.IsBodyHtml = true;
mySmtpClient.Send(myMail);
}
catch (SmtpException ex)
{
throw new ApplicationException
("SmtpException has occured: " + ex.Message);
}
catch (Exception ex)
{
throw ex;
}
以更快的方式发送批量电子邮件的最佳方式是使用threads.I已编写此控制台应用程序用于发送批量电子邮件.我已通过创建两个线程池将批量电子邮件ID分成两批.
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Net.Mail;
namespace ConsoleApplication1
{
public class SendMail
{
string[] NameArray = new string[10] { "Recipient 1",
"Recipient 2",
"Recipient 3",
"Recipient 4",
"Recipient 5",
"Recipient 6",
"Recipient 7",
"Recipient 8",
"Recipient 9",
"Recipient 10"
};
public SendMail(int i, ManualResetEvent doneEvent)
{
Console.WriteLine("Started sending mail process for {0} - ", NameArray[i].ToString() + " at " + System.DateTime.Now.ToString());
Console.WriteLine("");
SmtpClient mailClient = new SmtpClient();
mailClient.Host = Your host name;
mailClient.UseDefaultCredentials = true;
mailClient.Port = Your mail server port number; // try with default port no.25
MailMessage mailMessage = new MailMessage(FromAddress,ToAddress);//replace the address value
mailMessage.Subject = "Testing Bulk mail application";
mailMessage.Body = NameArray[i].ToString();
mailMessage.IsBodyHtml = true;
mailClient.Send(mailMessage);
Console.WriteLine("Mail Sent succesfully for {0} - ",NameArray[i].ToString() + " at " + System.DateTime.Now.ToString());
Console.WriteLine("");
_doneEvent = doneEvent;
}
public void ThreadPoolCallback(Object threadContext)
{
int threadIndex = (int)threadContext;
Console.WriteLine("Thread process completed for {0} ...",threadIndex.ToString() + "at" + System.DateTime.Now.ToString());
_doneEvent.Set();
}
private ManualResetEvent _doneEvent;
}
public class Program
{
static int TotalMailCount, Mailcount, AddCount, Counter, i, AssignI;
static void Main(string[] args)
{
TotalMailCount = 10;
Mailcount = TotalMailCount / 2;
AddCount = Mailcount;
InitiateThreads();
Thread.Sleep(100000);
}
static void InitiateThreads()
{
//One event is used for sending mails for each person email id as batch
ManualResetEvent[] doneEvents = new ManualResetEvent[Mailcount];
// Configure and launch threads using ThreadPool:
Console.WriteLine("Launching thread Pool tasks...");
for (i = AssignI; i < Mailcount; i++)
{
doneEvents[i] = new ManualResetEvent(false);
SendMail SRM_mail = new SendMail(i, doneEvents[i]);
ThreadPool.QueueUserWorkItem(SRM_mail.ThreadPoolCallback, i);
}
Thread.Sleep(10000);
// Wait for all threads in pool to calculation...
//try
//{
// // WaitHandle.WaitAll(doneEvents);
//}
//catch(Exception e)
//{
// Console.WriteLine(e.ToString());
//}
Console.WriteLine("All mails are sent in this thread pool.");
Counter = Counter+1;
Console.WriteLine("Please wait while we check for the next thread pool queue");
Thread.Sleep(5000);
CheckBatchMailProcess();
}
static void CheckBatchMailProcess()
{
if (Counter < 2)
{
Mailcount = Mailcount + AddCount;
AssignI = Mailcount - AddCount;
Console.WriteLine("Starting the Next thread Pool");
Thread.Sleep(5000);
InitiateThreads();
}
else
{
Console.WriteLine("No thread pools to start - exiting the batch mail application");
Thread.Sleep(1000);
Environment.Exit(0);
}
}
}
}
我在数组列表中为样本定义了10个接收者.它将创建两批电子邮件来创建两个线程池来发送邮件.您也可以从数据库中选择详细信息.
您可以通过在控制台应用程序中复制和粘贴它来使用此代码.(替换program.cs文件).然后应用程序就可以使用了.
我希望这可以帮助你 :).
码:
using System.Net.Mail
new SmtpClient("smtp.server.com", 25).send("from@email.com",
"to@email.com",
"subject",
"body");
群发电子邮件:
SMTP服务器通常对帽子可以同时处理的连接数量有限制,如果您尝试发送数百封电子邮件,您的应用程序可能会显示无响应.
解决方案:
如果要构建WinForm,请使用BackgroundWorker处理队列.
如果您使用的是IIS SMTP服务器或具有发件箱文件夹的SMTP服务器,则可以使用SmtpClient().PickupDirectoryLocation ="c:/ smtp/outboxFolder"; 这将使您的系统保持响应.
如果您没有使用本地SMTP服务器,那么您可以构建系统服务以使用Filewatcher监视forlder,然后处理您放入的任何电子邮件.
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