private void RemoveAttachedFileButton_Click(object sender, EventArgs e)
{
for (int x = attachmentListBox.SelectedIndices.Count - 1; x >= 0; x--)
{
int element = attachmentListBox.SelectedIndices[x];
// decrement total file size
FilesTotalLength -= new FileInfo(AttachmentFilePaths[element]).Length;
AttachmentFilePaths.RemoveAt(element);
AttachmentFileNames.RemoveAt(element);
}
UpdateTotalFilesLengthInfo();
UpdateBindings();
toolStripStatusLabel.Text = string.Empty;
}
private void AttachFileButton_Click(object sender, EventArgs e)
{
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
foreach (string file in openFileDialog.FileNames)
{
// check, if list contains current file
if (AttachmentFilePaths.Contains(file))
{
MessageBox.Show($"File '{file}' already added", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
continue;
}
long fileLength = new FileInfo(file).Length;
if (FilesTotalLength + fileLength > (long.Parse(fileSizeLimitTextBox.Text) * 1048576))
{
toolStripStatusLabel.Text = string.Empty;
MessageBox.Show($"Attachment(s) total file size exceeds the limit allowed", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
continue;
}
else
{
// increment total file size
FilesTotalLength += fileLength;
}
AttachmentFilePaths.Add(file);
AttachmentFileNames.Add(Path.GetFileName(file));
}
UpdateTotalFilesLengthInfo();
UpdateBindings();
toolStripStatusLabel.Text = "File(s) added";
}
}
private async Task SendEmailAsync()
{
try
{
var client = new SmtpClient()
{
Host = serverHostnameTextBox.Text,
Port = int.Parse(serverPortTextBox.Text),
Timeout = SMTP_CLIENT_TIMEOUT,
Credentials = new NetworkCredential(usernameTextBox.Text, passwordTextBox.Text),
EnableSsl = useSslCheckBox.Checked
};
using var mail = new MailMessage();
// validate 'From' email address
ValidateEmail(fromTextBox.Text);
mail.From = new MailAddress(fromTextBox.Text);
// add 'To' recipients
if (!string.IsNullOrEmpty(toTextBox.Text))
{
string[] toRecipients = toTextBox.Text.Split(';');
foreach (string recipient in toRecipients)
{
// validate email address
ValidateEmail(recipient);
mail.To.Add(new MailAddress(recipient));
}
}
// add 'CC' recipients
if (!string.IsNullOrEmpty(ccTextBox.Text))
{
string[] ccRecipients = ccTextBox.Text.Split(';');
foreach (string recipient in ccRecipients)
{
// validate email address
ValidateEmail(recipient);
mail.CC.Add(new MailAddress(recipient));
}
}
mail.Subject = subjectTextBox.Text;
mail.BodyEncoding = Encoding.UTF8;
mail.IsBodyHtml = htmlBodyCheckBox.Checked;
if (mail.IsBodyHtml)
{
// replace '\n' chars with "<br/>"
var sb = new StringBuilder(messageRichTextBox.Text);
sb.Replace("\n", "<br/>");
string timestamp = string.Empty;
// check, if timestamp is required
if (timestampCheckBox.Checked)
{
timestamp = $"<p><b>{GetUtcTimestamp()}</b></p>";
}
string htmlBody = "<html>" +
$"<head>" +
$"<title></title>" +
$"</head>" +
$"<body>" +
$"<p>{sb.ToString()}</p>" +
timestamp +
$"</body>" +
$"</html>";
mail.Body = htmlBody;
}
else
{
string timestamp = string.Empty;
// check, if timestamp is required
if (timestampCheckBox.Checked)
{
timestamp = $"\n\n{GetUtcTimestamp()}";
}
mail.Body = messageRichTextBox.Text + timestamp;
}
// add attachements, if required
if (AttachmentFilePaths.Any())
{
foreach (string file in AttachmentFilePaths)
{
var attachment = new Attachment(file);
if (safeExtensionCheckBox.Checked)
{
// remove file extension and then append the 'safe' one
attachment.Name = Path.GetFileNameWithoutExtension(file);
attachment.Name += SAFE_FILE_EXTENSION;
}
mail.Attachments.Add(attachment);
}
}
using (var sendingForm = new SendingForm())
{
sendingForm.sendingLabel.Text = $"Sending email to {mail.To}";
toolStripStatusLabel.Text = $"Sending email to {mail.To}";
sendingForm.Show();
await Task.Run(() =>
{
try
{
_emailSent = false;
client.Send(mail);
_emailSent = true;
}
catch (Exception ex)
{
toolStripStatusLabel.Text = "Exception occured";
#if DEBUG
MessageBox.Show($"{ex.Message}\n{ex.InnerException}\n{ex.StackTrace}", "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
#else
MessageBox.Show($"{ex.Message}", "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
#endif
return;
}
});
}
if (_emailSent)
{
toolStripStatusLabel.Text = $"Email successfully sent to {mail.To}";
MessageBox.Show($"Email successfully sent to {mail.To}", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch (Exception ex)
{
toolStripStatusLabel.Text = "Exception occured";
#if DEBUG
MessageBox.Show($"{ex.Message}\n{ex.InnerException}\n{ex.StackTrace}", "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
#else
MessageBox.Show($"{ex.Message}", "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
#endif
}
}
