群发邮件功能的完善

邮件有需要加密的地方，提供一个加密方法类

public static class DesSet
{
/// <summary>
/// 加密方法 Key 必须为8位
/// </summary>
/// <param name="pToEncrypt"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
/// <summary>
/// 解密方法 Key 必须为8位
/// </summary>
/// <param name="pToDecrypt"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Decrypt(string pToDecrypt, string sKey)
{
try
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
//如果数据为空字符串会报不正确的数据
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
catch
{
return null;
}
}
/// <summary>
/// 解密方法 Key 必须为8位
/// </summary>
/// <param name="pToDecrypt"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string qxDecrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
//如果数据为空字符串会报不正确的数据
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
}

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群发上千封邮件，发送太快，会出现可能被服务器拒绝的情况。使用线程控制发送间隔

protected void btn_sendMail_Click(object sender, EventArgs e)
{
ThreadStart mailThread = new ThreadStart(SendMail);
Thread sendMail = new Thread(mailThread);
sendMail.Name = "thread send mail";
sendMail.Start();
}

private void SendMail()
{
Mails mySendMail = new Mails();
for (int i = 0; i < lists.Count; i++)
{
mySendMail = new Mails("nihao",lists[i].ToString(), lists[i]);
mySendMail.SendMail();
if ((i + 1) % 50 == 0)
{
Thread.Sleep(60000);//歇一分钟再发吧。。
}
}
}

*****************************************************************

Mails类

public void SendMail()
{
lock (this)
{
Thread.Sleep(3000);
//创建smtpclient对象
System.Net.Mail.SmtpClient client = new SmtpClient();
client.Host = smtp;
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential(from,pwd);
client.DeliveryMethod = SmtpDeliveryMethod.Network;

//创建mailMessage对象
System.Net.Mail.MailMessage message = new MailMessage(from,to);
message.Subject = subject;
message.SubjectEncoding = Encoding.UTF8;
message.Body = body;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = true;

try
{
client.Send(message);
StreamWriter sw = new StreamWriter("c:/message.txt", true);
sw.Write(this.to+" 发送成功" + "\r\n");
sw.Close();
}
catch (Exception ex)
{
StreamWriter sw = new StreamWriter("c:/message.txt", true);
sw.Write(this.to+" 发送失败。失败原因："+ex.Message + "\r\n");
sw.Close();
}
}
}