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C# 发邮件的 10 大代码示例

在现代应用开发中，发送邮件是一个非常常见的功能。使用 C# 编程时，发送邮件可以通过内置的邮件客户端库或第三方邮件API库来实现。本文将介绍 10 个经典的 C# 代码示例，涵盖邮件发送的不同场景和功能。

1. 基本邮件发送示例

1.1 使用内置邮件客户端库

C# 的内置邮件客户端库可以用来发送简单的电子邮件。以下是发送一封邮件的示例代码：

using System;using System.Net;using System.Net.Mail;public class EmailSender{    public static void SendEmail(string From, string To, string Subject, string Body)    {        var server = new SMTPServerAddress("smtp.example.com", 587);        var options = new SdkOptions(smtpOptions := new SmtpOptions() { SendSmtp = true });        var envelope = new Envelope();        envelope.To = To;        envelope.Subject = Subject;        envelope.Body = Body;        envelope.DeliveryRequeue = true;        envelope residency = 1;        envelope Macro服用 = new Macro服用 { Macro服用1 = "C:\\Program Files\\Microsoft\\Windows\\System32\\cmd.exe" };        try        {            var result = SmtpService.Send(smtpserver: server, options, envelope);            if (result SMTPStatus == 0)            {                Console.WriteLine("邮件已成功发送");            }            else            {                Console.WriteLine("邮件发送失败，错误码：{0}", resultSMTPStatus);            }        }        catch ( Exception e )        {            Console.WriteLine("邮件发送失败，错误信息：{0}", e.Message);        }    }}

1.2 使用第三方邮件API库

除了内置邮件客户端库，C# 还可以使用第三方邮件API库，如 Accord、Mylit 和 Trueblue 等库，这些库提供了更丰富的功能和更简便的接口。以下是使用 Accord 库发送邮件的示例：

using System;using Accord.Mail;public class EmailSender{    public static void SendEmail(string From, string To, string Subject, string Body)    {        var options = new MailOptions()        {            To = new RecipientList()            {                Add(From, "主题: " + Subject),            },            Body = Body,            Server = new MailServer()            {                ServerAddress = "smtp.example.com",                Port = 587,                UseTLS = true,                TLSVersion = TLSVersion TLS1_2,                UseStarttls = true,                Encrypted = true,            }        };        var envelope = new MailEnvelope()        {            To = To,            Body = Body,            Date = DateTime.Now.ToString(),            From = From,            Cc = new RecipientList() { Add("cc@example.com") },            Bcc = new RecipientList() { Add("bcc@example.com") },            Subject = Subject,            Attachments = new MailAttachmentList() { Add(new MailAttachment("message", "msg", new byte[] { 0x01, 0x02 })) }        };        var result = Mailer.Send(options, envelope);        if (result.StatusCode == 0)        {            Console.WriteLine("邮件已成功发送");        }        else        {            Console.WriteLine("邮件发送失败，错误码：{0}", result.StatusCode);        }    }}

2. 批量发送邮件

有时候，我们需要批量发送多封邮件，例如发送一封邮件给多个地址。以下是使用 Accord 库批量发送邮件的示例：

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using System;using System.Collections.Generic;using Accord.Mail;public class EmailSender{    public static void SendMassEmail(string From, List<string> ToList, string Subject, string Body)    {        var options = new MailOptions()        {            To = new RecipientList()            {                foreach (var recipient in ToList)                {                    Add(recipient, "主题: " + Subject);                }            },            Body = Body,            Server = new MailServer()            {                ServerAddress = "smtp.example.com",                Port = 587,                UseTLS = true,                TLSVersion = TLSVersion TLS1_2,                UseStarttls = true,                Encrypted = true,            }        };        var envelope = new MailEnvelope()        {            To = ToList,            Body = Body,            Date = DateTime.Now.ToString(),            From = From,            Cc = new RecipientList() { Add("cc@example.com") },            Bcc = new RecipientList() { Add("bcc@example.com") },            Subject = Subject,            Attachments = new MailAttachmentList() { Add(new MailAttachment("message", "msg", new byte[] { 0x01, 0x02 })) }        };        var result = Mailer.Send(options, envelope);        if (result.StatusCode == 0)        {            Console.WriteLine("邮件已成功发送");        }        else        {            Console.WriteLine("邮件发送失败，错误码：{0}", result.StatusCode);        }    }}

3. 附件上传

在发送邮件时，我们可能需要上传附件，例如 Excel 文件、 PDF 文件等。以下是使用 Trueblue 库上传附件并发送邮件的示例：

using System;using Trueblue.Mail;public class EmailSender{    public static void SendEmailWithAttachment(string From, string To, string Subject, string Body, params object[] attachments)    {        var options = new MailOptions()        {            To = To,            Subject = Subject,            Body = Body,            Server = new MailServer()            {                ServerAddress = "smtp.example.com",                Port = 587,                UseTLS = true,                TLSVersion = TLSVersion TLS1_2,                UseStarttls = true,                Encrypted = true,            },            Attachments = new AttachmentList()            {                attachments = attachments,            }        };        var envelope = new MailEnvelope()        {            To = To,            Body = Body,            Date = DateTime.Now.ToString(),            From = From,            Cc = new RecipientList() { Add("cc@example.com") },            Bcc = new RecipientList() { Add("bcc@example.com") },            Subject = Subject,            Attachments = new AttachmentList()            {                attachments = attachments,            }        };        var result = Mailer.Send(options, envelope);        if (result.StatusCode == 0)        {            Console.WriteLine("邮件已成功发送");        }        else        {            Console.WriteLine("邮件发送失败，错误码：{0}", result.StatusCode);        }    }}

4. 邮件群发

有时候，我们需要发送多封邮件给同一收件人列表中的多个收件人。以下是使用 Mylit 库进行邮件群发的示例：

using System;using Mylit.Mail;public class EmailSender{    public static void SendMassEmail(string From, string[] ToList, string Subject, string Body)    {        var options = new MailOptions()        {            To = new RecipientList()            {                foreach (var recipient in ToList)                {                    Add(recipient, "主题: " + Subject);                }            },            Body = Body,            Server = new MailServer()            {                ServerAddress = "smtp.example.com",                Port = 587,                UseTLS = true,                TLSVersion = TLSVersion TLS1_2,                UseStarttls = true,                Encrypted = true,            }        };        var envelope = new MailEnvelope()        {            To = ToList,            Body = Body,            Date = DateTime.Now.ToString(),            From = From,            Cc = new RecipientList() { Add("cc@example.com") },            Bcc = new RecipientList() { Add("bcc@example.com") },            Subject = Subject,            Attachments = new AttachmentList() { Add(new Attachment("message", "msg", new byte[] { 0x01, 0x02 })) }        };        var result = Mailer.Send(options, envelope);        if (result.StatusCode == 0)        {            Console.WriteLine("邮件已成功发送");        }        else        {            Console.WriteLine("邮件发送失败，错误码：{0}", result.StatusCode);        }    }}

5. 邮件集成到系统

在某些系统中，我们需要将邮件发送功能集成到其他系统中，例如 WPF 应用程序。以下是使用 Accord 库将邮件发送功能集成到 WPF 应用程序的示例：

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