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C#发邮件的10大代码示例

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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：

C#发邮件的10大代码示例

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：

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：

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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：


using System;
using System.Windows;
using System.Windows.Controls;
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using System.Windows.Controls designer;
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