.Net Core之发送邮件

2022-06-30 09:33:02 阅读：145 来源： 互联网

标签：Core SendEmailAsync string bodyBuilder sb new Net 邮件 subject

.Net Core之发送邮件

发送邮件是一个通用功能，这里我们使用MailKit配合Polly做重试

封装EmailSender

IEmailSender

public interface IEmailSender
{
    Task SendEmailAsync(string to, string subject, string message, TextFormat textFormat = TextFormat.Plain);

    Task SendEmailAsync(List<string> to, string subject, string message, TextFormat textFormat = TextFormat.Plain);
    
    Task SendEmailAsync(string to, string subject, BodyBuilder bodyBuilder);

    Task SendEmailAsync(List<string> to, string subject, BodyBuilder bodyBuilder);
}

EmailSender

public class EmailSender : IEmailSender
{
    private readonly EmailSettings _emailSettings;
    private readonly ILogger _logger;

    public EmailSender(IOptions<EmailSettings> emailSettings, ILogger<EmailSender> logger)
    {
        _emailSettings = emailSettings.Value;
        _logger = logger;
    }

    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="to">接收邮箱(批量)</param>
    /// <param name="subject">主题</param>
    /// <param name="bodyBuilder">内容</param>
    /// <returns></returns>
    public async Task SendEmailAsync(List<string> to, string subject, BodyBuilder bodyBuilder)
    {
        //三次重试机制
        var retryPolicy = Policy.Handle<Exception>().RetryAsync(3,
            (exception, retryCount, context) =>
            {
                _logger?.LogError("retryCount" + retryCount + ":" + exception);
            });
        try
        {
            var mimeMessage = new MimeMessage();
            mimeMessage.From.Add(new MailboxAddress(_emailSettings.MailSenderName, _emailSettings.MailSender));
            mimeMessage.To.AddRange(to.Select(e => new MailboxAddress(e)));
            mimeMessage.Subject = subject;
            mimeMessage.Body = bodyBuilder.ToMessageBody();

            await retryPolicy.ExecuteAndCaptureAsync(async () =>
            {
                using (var client = new SmtpClient())
                {
                    // accept all SSL certificates (in case the server supports STARTTLS)
                    client.ServerCertificateValidationCallback = (s, c, h, e) => true;

                    await client.ConnectAsync(_emailSettings.MailServer, _emailSettings.MailPort, true);

                    await client.AuthenticateAsync(_emailSettings.MailSender, _emailSettings.MailPassword);

                    await client.SendAsync(mimeMessage);

                    await client.DisconnectAsync(true);
                }
            });
        }
        catch (Exception ex)
        {
            _logger?.LogError("SendEmailAsync:", ex);
        }
    }

    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="to">接收邮箱(单个)</param>
    /// <param name="subject">主题</param>
    /// <param name="bodyBuilder">内容</param>
    /// <returns></returns>
    public async Task SendEmailAsync(string to, string subject, BodyBuilder bodyBuilder)
    {
        await SendEmailAsync(new List<string>() { to }, subject, bodyBuilder);
    }

    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="to">接收邮箱(单个)</param>
    /// <param name="subject">主题</param>
    /// <param name="message">内容</param>
    /// <param name="textFormat">文本格式</param>
    /// <returns></returns>
    public async Task SendEmailAsync(string to, string subject, string message,
        TextFormat textFormat = TextFormat.Plain)
    {
        await SendEmailAsync(new List<string>() { to }, subject, message, textFormat);
    }

    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="to">接收邮箱(可多个)</param>
    /// <param name="subject">主题</param>
    /// <param name="message">内容</param>
    /// <param name="textFormat">文本格式</param>
    /// <returns></returns>
    public async Task SendEmailAsync(List<string> to, string subject, string message,
        TextFormat textFormat = TextFormat.Plain)
    {
        var bodyBuilder = new BodyBuilder();
        switch (textFormat)
        {
            case TextFormat.Html:
                bodyBuilder.HtmlBody = message;
                break;
            default:
                bodyBuilder.TextBody = message;
                break;
        }

        await SendEmailAsync(to, subject, bodyBuilder);
    }
}

折叠

注入

services.AddSingleton<IEmailSender, EmailSender>();

使用

发送邮件常用到html格式和附件，这里用到了html表格和excel附件

/// <summary>
/// DataTable转为Html表格字符
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string FormatHtmlTable(DataTable dt)
{
    var sb = new StringBuilder();
    //开始
    sb.Append(
        "<table cellpadding='5' cellspacing='0' style='border: 1px solid #ccc;font-size: 9pt;font-family:Arial'>");

    //表头
    sb.Append("<tr>");
    foreach (DataColumn column in dt.Columns)
    {
        sb.Append($"<th style='border: 1px solid #ccc'>{column.ColumnName}</th>");
    }

    sb.Append("</tr>");

    //数据
    foreach (DataRow row in dt.Rows)
    {
        sb.Append("<tr>");
        foreach (DataColumn column in dt.Columns)
        {
            sb.Append($"<td style='width:100px;border: 1px solid #ccc'>{row[column.ColumnName]}</td>");
        }

        sb.Append("</tr>");
    }

    //结束
    sb.Append("</table>");
    return sb.ToString();
}

折叠

//自定义BodyBuilder，使用html表格和附件
var bodyBuilder = new BodyBuilder();
//html
var table = new DataTable();
var tableHtml = HtmlUtils.FormatHtmlTable(table);
bodyBuilder.HtmlBody = tableHtml;
//附件
bodyBuilder.Attachments.Add($"附件.xlsx",byte[]data);

await emailSender.SendEmailAsync(email, emailSubject, bodyBuilder);

转 https://www.cnblogs.com/shadowxs/p/14291012.html

标签：Core,SendEmailAsync,string,bodyBuilder,sb,new,Net,邮件,subject
来源： https://www.cnblogs.com/wl-blog/p/16425654.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

.Net Core之发送邮件

.Net Core之发送邮件

封装EmailSender