using System;
using System.Net;
using System.Net.Mail;
 
class EmailSender
{
    public static void Main()
    {
        try
        {
            // 配置SMTP服務(wù)器信息（以QQ郵箱為例）
            string smtpServer = "smtp.qq.com";      //此處修改發(fā)送郵箱的服務(wù)器地址
            int smtpPort = 587;
            bool enableSsl = true;
            string fromEmail = "your_email@qq.com";//使用的郵箱
            string password = "your_password_or_auth_code"; // 此處填寫剛剛獲得的授權(quán)碼
 
            // 創(chuàng)建郵件客戶端
            using SmtpClient client = new SmtpClient(smtpServer)
            {
                Port = smtpPort,
                Credentials = new NetworkCredential(fromEmail, password),
                EnableSsl = enableSsl
            };
 
            // 創(chuàng)建郵件內(nèi)容
            MailMessage message = new MailMessage
            {
                From = new MailAddress(fromEmail),
                Subject = "測試郵件",
                Body = "這是一封來自C#程序的測試郵件",
                IsBodyHtml = false // 設(shè)置為true發(fā)送HTML郵件
            };
 
            // 添加收件人
            message.To.Add("recipient@example.com");          //填入接受郵件的郵箱地址
 
            // 發(fā)送郵件
            client.Send(message);
            Console.WriteLine("郵件發(fā)送成功！");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"郵件發(fā)送失?。簕ex.Message}");
        }
    }
}

using System;
using System.Diagnostics;
using System.Net;
using System.Net.Mail;
using System.Security.Cryptography;
using System.Text;
 
class EmailSender
{
 
    // ======== 配置信息 ========
    static string  smtpServer = "smtp.qq.com";
    static int smtpPort = 587;
    static bool enableSsl = true;
    static string fromEmail = "填入發(fā)送的郵箱"; //發(fā)送郵箱
    static string password = "郵箱授權(quán)碼"; // QQ郵箱需要授權(quán)碼
    static string incomingEmail = "接受郵件的郵箱地址";//收件郵箱地址 
 
    private static readonly object fileLock = new object();
    private const string LogDirectory = "EmailSendLogs";
 
    /// <summary>
    /// 報(bào)警信息發(fā)送至郵箱
    /// </summary>
    /// <param name="alertLevel">報(bào)警級(jí)別支持： 
    ///                         CRITICAL：嚴(yán)重問題（紅色）
    ///                         HIGH：高級(jí)別問題（橙色）
    ///                         MEDIUM：中等問題（黃色）
    ///                         LOW：低級(jí)別通知（綠色）
    ///                         </param>
    /// <param name="alertContent">報(bào)警內(nèi)容</param>
    /// <param name="errorDetails">錯(cuò)誤詳情</param>
    /// <param name="attachmentPaths">附件</param>
    public static void SendToEmail(string alertLevel, string alertContent, string errorDetails = null, string[] attachmentPaths = null)
    {
        try
        {
            //1和2是會(huì)在程序運(yùn)行的文件夾中生成一個(gè)日志文件，當(dāng)同一個(gè)報(bào)錯(cuò)今天已經(jīng)發(fā)送過了，將會(huì)                            //不再發(fā)送，防止報(bào)錯(cuò)一直觸發(fā)然后一直給自己發(fā)送郵件，這樣子抽牛馬干活打在自己身上就太痛了
 
            // ===== 1. 生成錯(cuò)誤唯一標(biāo)識(shí) =====
            string errorHash = GenerateErrorHash(alertContent, errorDetails);
 
            // ===== 2. 檢查是否已發(fā)送過 =====
            if (IsAlreadySentToday(errorHash))
            {
                Console.WriteLine("相同錯(cuò)誤今日已發(fā)送過，不再重復(fù)發(fā)送");
                return;
            }
 
 
 
 
 
            // ======== 創(chuàng)建郵件客戶端 ========
            using SmtpClient client = new SmtpClient(smtpServer)
            {
                Port = smtpPort,
                Credentials = new NetworkCredential(fromEmail, password),
                EnableSsl = enableSsl
            };
 
            // ======== 報(bào)警級(jí)別顏色映射 ========
            var alertLevelInfo = new Dictionary<string, (string color, string emoji)>
            {
                { "CRITICAL", ("#d32f2f", "??") },  // 紅色
                { "HIGH",     ("#f57c00", "??") },  // 橙色
                { "MEDIUM",  ("#ffa000", "?") },  // 黃色
                { "LOW",     ("#4caf50", "??") }   // 綠色
            };
 
            // 獲取當(dāng)前報(bào)警級(jí)別的顏色和表情符號(hào)
            var (color, emoji) = alertLevelInfo.ContainsKey(alertLevel)
                ? alertLevelInfo[alertLevel]
                : ("#666666", "??");
 
            // ======== 構(gòu)建郵件內(nèi)容 ========
            string htmlBody = $@"
            <!DOCTYPE html>
            <html>
            <head>
                <style>
                    .card {{ 
                        border: 1px solid #e0e0e0; 
                        padding: 20px; 
                        max-width: 800px;
                        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
                    }}
                    .header {{ 
                        border-bottom: 2px solid {color};
                        padding-bottom: 10px;
                        margin-bottom: 20px;
                    }}
                    .alert-level {{ 
                        color: {color};
                        font-weight: bold;
                    }}
                    pre {{
                        background: #f8f9fa;
                        padding: 15px;
                        border-radius: 4px;
                        overflow-x: auto;
                    }}
                </style>
            </head>
            <body>
                <div class='card'>
                    <div class='header'>
                        <h2>{emoji} 系統(tǒng)報(bào)警 - {alertLevel}</h2>
                    </div>
                    <table>
                        <tr><th>報(bào)警時(shí)間:</th><td>{DateTime.Now:yyyy-MM-dd HH:mm:ss}</td></tr>
                        <tr><th>報(bào)警級(jí)別:</th><td class='alert-level'>{alertLevel}</td></tr>
                    </table>
                    <h3>▌ 報(bào)警內(nèi)容</h3>
                    <p>{alertContent}</p>
                    {(errorDetails != null ? $@"
                    <h3>▌ 錯(cuò)誤詳情</h3>
                    <pre>{errorDetails}</pre>
                    " : "")}
                    <div style='margin-top: 25px; color: #666; font-size: 0.9em;'>
                        <hr>
                        <p>此郵件由系統(tǒng)自動(dòng)發(fā)送，請(qǐng)勿直接回復(fù)</p>
                        <p>負(fù)責(zé)人：牛馬程序員 (123456@niuma.com)</p>
                    </div>
                </div>
            </body>
            </html>";
 
            // ======== 創(chuàng)建郵件消息 ========
            MailMessage message = new MailMessage
            {
                From = new MailAddress(fromEmail),
                Subject = $"{emoji} 系統(tǒng)報(bào)警 - {alertLevel}",
                Body = htmlBody,
                IsBodyHtml = true
            };
 
            // 添加收件人
            message.To.Add(incomingEmail);
 
            // 添加附件
            if (attachmentPaths != null)
            {
                foreach (var path in attachmentPaths)
                {
                    if (File.Exists(path))
                    {
                        message.Attachments.Add(new Attachment(path));
                    }
                }
            }
 
            // ======== 發(fā)送郵件 ========
            client.Send(message);
            // ===== 4. 記錄發(fā)送日志 =====
            LogError(errorHash, alertLevel, alertContent, errorDetails);
            Console.WriteLine("郵件發(fā)送成功！");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"郵件發(fā)送失?。簕ex.Message}");
        }
    }
 
    /// <summary>
    /// 創(chuàng)建唯一加密標(biāo)識(shí)符號(hào)
    /// </summary>
    /// <param name="content"></param>
    /// <param name="details"></param>
    /// <returns></returns>
    private static string GenerateErrorHash(string content, string details)
    {
        using MD5 md5 = MD5.Create();
        string rawData = $"{content}|{details}";
        byte[] hashBytes = md5.ComputeHash(Encoding.UTF8.GetBytes(rawData));
        return BitConverter.ToString(hashBytes).Replace("-", "");
    }
 
    /// <summary>
    /// 檢查是否已經(jīng)發(fā)送過
    /// </summary>
    /// <param name="errorHash"></param>
    /// <returns></returns>
    private static bool IsAlreadySentToday(string errorHash)
    {
        string todayLogFile = GetTodayLogFilePath();
 
        lock (fileLock)
        {
            if (!File.Exists(todayLogFile)) return false;
 
            foreach (string line in File.ReadAllLines(todayLogFile))
            {
                if (line.StartsWith(errorHash))
                {
                    return true;
                }
            }
        }
        return false;
    }
    //記錄報(bào)警內(nèi)容
    private static void LogError(string errorHash, string level,
                        string content, string details)
    {
        string logEntry = $"{errorHash}|{DateTime.Now:yyyy-MM-dd HH:mm:ss}|" +
                         $"{level}|{content}|{details}\n";
 
        lock (fileLock)
        {
            EnsureLogDirectoryExists();
            File.AppendAllText(GetTodayLogFilePath(), logEntry);
        }
    }
 
    //獲取報(bào)警日志地址
    private static string GetTodayLogFilePath()
    {
        return Path.Combine(LogDirectory,
                          $"SnedErrorLog_{DateTime.Now:yyyyMMdd}.txt");
    }
    //無文件創(chuàng)建文件夾
    private static void EnsureLogDirectoryExists()
    {
        if (!Directory.Exists(LogDirectory))
        {
            Directory.CreateDirectory(LogDirectory);
        }
    }
 
 
    public static  void Main()
    {
        SendToEmail(
        alertLevel: "HIGH",
        alertContent: "數(shù)據(jù)庫益處請(qǐng)?zhí)幚恚赡軐?dǎo)致系統(tǒng)響應(yīng)緩慢。",
        errorDetails: "TimeoutException: Could not connect to database.\n   at DatabaseService.Connect() Line 123",
        attachmentPaths: new[] { "error.log" });
 
        SendToEmail(
     alertLevel: "HIGH",
     alertContent: "數(shù)據(jù)庫連接池使用率超過90%，可能導(dǎo)致系統(tǒng)響應(yīng)緩慢。",
     errorDetails: "TimeoutException: Could not connect to database.\n   at DatabaseService.Connect() Line 123",
     attachmentPaths: new[] { "error.log" });
 
    }
}