これは最近かなり人気のある問題/質問のようですが、問題の解決策が見つからないようです.
メールを送信するための単純な Windows サービスを c# で作成しました。アプリは、メモリ使用量を除いてうまく機能します。アプリのフロント エンドは Web ベースであり、サービスはディレクトリに作成されるテキスト ファイルによってキューに入れられます。テキスト ファイルを読み取った後、サービスは MS SQL データベースからニュースレター情報と電子メール アドレスを収集し、4 秒ごとに 1 つの電子メールの送信を開始します。タスク マネージャーでサービスの実行を見ていると、CPU 使用率が 4 秒ごとに上昇し、すぐに低下することがわかります。一方、メモリはすべてのメールではなく、3 ～ 4 メールごとに 50 ～ 75k 増加しているようです。これは、すべてのメールが送信されるまで増加し続けます。私はちょうど約を送信しました。2100通のメールとメモリ使用量は最大100MBでした。私が気づいたもう一つのことは、すべての電子メールが送信された後、サービスを再起動するまで、メモリ使用量はこの合計で保持されます。サービスがアイドル状態の場合、メモリは約 6500k で実行されます。メーリングの完了後にこのメモリ使用量を減らして処分する方法について、誰か提案はありますか? 私のコードは以下です。どんな助けでも大歓迎です..
namespace NewsMailer
{
public partial class NewsMailer : ServiceBase
{
private FileSystemWatcher dirWatcher;
private static string filePath = @"E:\Intranets\Internal\Newsletter\EmailQueue";
private static string attachPath = @"E:\Intranets\Internal\Newsletter\Attachments";
private string newsType = String.Empty;
private string newsSubject = String.Empty;
private string newsContent = String.Empty;
private string userName = String.Empty;
private string newsAttachment = "";
private int newsID = 0;
private int emailSent = 0;
private int emailError = 0;
public NewsMailer()
{
InitializeComponent();
}
protected override void OnStart(string[] args)
{
dirWatcher = new FileSystemWatcher();
dirWatcher.Path = filePath;
dirWatcher.Created += new FileSystemEventHandler(ReadText);
dirWatcher.EnableRaisingEvents = true;
}
protected override void OnStop()
{
dirWatcher.EnableRaisingEvents = false;
dirWatcher.Dispose();
}
private void ClearVar()
{
newsType = String.Empty;
newsSubject = String.Empty;
newsContent = String.Empty;
userName = String.Empty;
newsAttachment = "";
newsID = 0;
emailSent = 0;
emailError = 0;
}
private void ReadText(object sender, FileSystemEventArgs e)
{
ClearVar();
SetLimits();
string txtFile = filePath + @"\QueueEmail.txt";
StreamReader sr = new StreamReader(txtFile);
string txtLine = String.Empty;
try
{
while ((txtLine = sr.ReadLine()) != null)
{
string[] lineCpl = txtLine.Split('§');
newsType = lineCpl[0];
userName = lineCpl[1];
newsID = Convert.ToInt32(lineCpl[2]);
}
}
catch (IOException ex)
{
SendExByMail("ReadText() IO Error", ex);
}
catch (Exception ex)
{
SendExByMail("ReadText() General Error", ex);
}
finally
{
sr.Close();
sr.Dispose();
}
GetNews();
}
[DllImport("kernel32.dll")]
public static extern bool SetProcessWorkingSetSize(IntPtr proc, int min, int max);
private void SetLimits()
{
GC.Collect();
GC.WaitForPendingFinalizers();
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, -1, -1);
}
private void DeleteText()
{
try
{
File.Delete(filePath + @"\QueueEmail.txt");
}
catch (IOException ex)
{
SendExByMail("DeleteText() IO Error", ex);
}
catch (Exception ex)
{
SendExByMail("DeleteText() General Error", ex);
}
}
private void GetNews()
{
string connectionString = ConfigurationManager.ConnectionStrings["contacts"].ConnectionString;
SqlConnection conn = new SqlConnection(connectionString);
string sqlSELECT = "SELECT newsSubject, newsContents, username, attachment FROM newsArchive " +
"WHERE ID = " + newsID;
SqlCommand comm = new SqlCommand(sqlSELECT, conn);
try
{
conn.Open();
using (SqlDataReader reader = comm.ExecuteReader())
{
while (reader.Read())
{
newsSubject = reader[0].ToString();
newsContent = reader[1].ToString();
userName = reader[2].ToString();
newsAttachment = reader[3].ToString();
}
reader.Dispose();
}
}
catch (SqlException ex)
{
SendExByMail("GetNews() SQL Error", ex);
}
catch (Exception ex)
{
SendExByMail("GetNews() General Error", ex);
}
finally
{
comm.Dispose();
conn.Dispose();
}
DeleteText();
GetAddress();
}
private void GetAddress()
{
string connectionString = ConfigurationManager.ConnectionStrings["contacts"].ConnectionString;
SqlConnection conn = new SqlConnection(connectionString);
string sqlSELECT = String.Empty;
if (newsType == "custom")
sqlSELECT = "SELECT DISTINCT email FROM custom";
else
sqlSELECT = "SELECT DISTINCT email FROM contactsMain WHERE queued = 'True'";
SqlCommand comm = new SqlCommand(sqlSELECT, conn);
try
{
conn.Open();
using (SqlDataReader reader = comm.ExecuteReader())
{
while (reader.Read())
{
try
{
if (CheckEmail(reader[0].ToString()) == true)
{
SendNews(reader[0].ToString());
Thread.Sleep(4000);
emailSent++;
}
else
{
SendInvalid(reader[0].ToString());
emailError++;
}
}
catch (SmtpException ex)
{
SendExByMail("NewsLetter Smtp Error", reader[0].ToString(), ex);
emailError++;
}
catch (Exception ex)
{
SendExByMail("Send NewsLetter General Error", reader[0].ToString(), ex);
emailError++;
}
finally
{
UnqueueEmail(reader[0].ToString());
}
}
reader.Dispose();
}
}
catch (SqlException ex)
{
SendExByMail("GetAddress() SQL Error", ex);
}
catch (Exception ex)
{
SendExByMail("GetAddress() General Error", ex);
}
finally
{
comm.Dispose();
conn.Dispose();
}
SendConfirmation();
}
private bool CheckEmail(string emailAddy)
{
bool returnValue = false;
string regExpress = @"^[\w-]+(?:\.[\w-]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}$";
Match verifyE = Regex.Match(emailAddy, regExpress);
if (verifyE.Success)
returnValue = true;
return returnValue;
}
private void SendNews(string emailAddy)
{
string today = DateTime.Today.ToString("MMMM d, yyyy");
using (MailMessage message = new MailMessage())
{
SmtpClient smtpClient = new SmtpClient();
MailAddress fromAddress = new MailAddress("");
message.From = fromAddress;
message.To.Add(emailAddy);
message.Subject = newsSubject;
if (newsAttachment != "")
{
Attachment wusaAttach = new Attachment(attachPath + newsAttachment);
message.Attachments.Add(wusaAttach);
}
message.IsBodyHtml = true;
#region Message Body
message.Body = "";
#endregion
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.Host = "";
smtpClient.Credentials = new System.Net.NetworkCredential("");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
}
private void UnqueueEmail(string emailAddy)
{
string connectionString = ConfigurationManager.ConnectionStrings["contacts"].ConnectionString;
SqlConnection conn = new SqlConnection(connectionString);
string sqlStatement = String.Empty;
if (newsType == "custom")
sqlStatement = "UPDATE custom SET queued = 'False' WHERE email LIKE '" + emailAddy + "'";
else
sqlStatement = "UPDATE contactsMain SET queued = 'False' WHERE email LIKE '" + emailAddy + "'";
SqlCommand comm = new SqlCommand(sqlStatement, conn);
try
{
conn.Open();
comm.ExecuteNonQuery();
}
catch (SqlException ex)
{
SendExByMail("UnqueueEmail() SQL Error", ex);
}
catch (Exception ex)
{
SendExByMail("UnqueueEmail() General Error", ex);
}
finally
{
comm.Dispose();
conn.Dispose();
}
}
private void SendConfirmation()
{
SmtpClient smtpClient = new SmtpClient();
using (MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress("");
MailAddress toAddress = new MailAddress();
message.From = fromAddress;
message.To.Add(toAddress);
//message.CC.Add(ccAddress);
message.Subject = "Your Newsletter Mailing Has Completed";
message.IsBodyHtml = true;
message.Body = "Total Emails Sent: " + emailSent +
"<br />Total Email Errors: " + emailError +
"<br />Contact regarding email errors if any were found";
smtpClient.Host = "";
smtpClient.Credentials = new System.Net.NetworkCredential("");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
ClearVar();
System.GC.Collect();
}
private void SendInvalid(string emailAddy)
{
SmtpClient smtpClient = new SmtpClient();
using (MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress("");
MailAddress toAddress = new MailAddress("");
message.From = fromAddress;
message.To.Add(toAddress);
//message.CC.Add(ccAddress);
message.Subject = "Invalid Email Address";
message.IsBodyHtml = true;
message.Body = "An invalid email address has been found, please check the following " +
"email address:<br />" + emailAddy;
smtpClient.Host = "";
smtpClient.Credentials = new System.Net.NetworkCredential("");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
}
private void SendExByMail(string subject, Exception ex)
{
SmtpClient smtpClient = new SmtpClient();
using (MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress("");
MailAddress toAddress = new MailAddress("");
message.From = fromAddress;
message.To.Add(toAddress);
//message.CC.Add(ccAddress);
message.Subject = subject;
message.IsBodyHtml = true;
message.Body = "An Error Has Occurred: <br />Exception: <br />" + ex.ToString();
smtpClient.Host = "";
smtpClient.Credentials = new System.Net.NetworkCredential("");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
}
private void SendExByMail(string subject, string body, Exception ex)
{
SmtpClient smtpClient = new SmtpClient();
using (MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress("", "MailerService");
MailAddress toAddress = new MailAddress("");
message.From = fromAddress;
message.To.Add(toAddress);
//message.CC.Add(ccAddress);
message.Subject = subject;
message.IsBodyHtml = true;
message.Body = "An Error Has Occurred:<br /><br />" + body + "<br /><br />Exception: <br />" + ex.ToString();
smtpClient.Host = "";
smtpClient.Credentials = new System.Net.NetworkCredential("");
smtpClient.Send(message);
smtpClient.ServicePoint.CloseConnectionGroup(smtpClient.ServicePoint.ConnectionName);
}
}
}
}