C#编程实现发送邮件的方法(可添加附件)

简介

在C#编程中需要经常发邮件，通常使用SMTP客户端类库实现邮件的发送。本篇攻略将详细讲解C#编程实现发送邮件的方法，并提供两个示例说明。

发送邮件的前置条件

在操作系统中需要安装SMTP服务，以用来发送邮件。常用的SMTP服务器有163邮箱、126邮箱、QQ邮箱、Gmail邮箱等，不同的邮箱提供不同的SMTP服务地址和端口。

发送邮件的步骤

1. 创建SMTP客户端对象，需要提供SMTP服务器地址、端口号、用户名、密码等相关信息。

SmtpClient client = new SmtpClient();
client.Host = "smtp.gmail.com"; // SMTP服务器地址
client.Port = 587; // 端口号
client.EnableSsl = true; // SSL加密
client.Credentials = new NetworkCredential("username", "password"); // 邮箱登录用户名和密码

1. 创建邮件对象，设置发件人信息、收件人信息、邮件主题、邮件内容等相关信息。

MailMessage message = new MailMessage();
message.From = new MailAddress("[e-mail]", "Sender"); // 发件人信息
message.To.Add(new MailAddress("[e-mail]", "Receiver")); // 收件人信息
message.Subject = "Email subject"; // 邮件主题
message.Body = "Email body"; // 邮件内容

1. 添加附件

Attachment attachment = new Attachment("attachment_file.docx");
message.Attachments.Add(attachment);

1. 发送邮件

client.Send(message);

示例一：发送无附件邮件

using System.Net;
using System.Net.Mail;

namespace Test
{
    public class EmailSender
    {
        public void SendEmail()
        {
            SmtpClient client = new SmtpClient();
            client.Host = "smtp.gmail.com";
            client.Port = 587;
            client.EnableSsl = true;
            client.Credentials = new NetworkCredential("username", "password");

            MailMessage message = new MailMessage();
            message.From = new MailAddress("[e-mail]", "Sender");
            message.To.Add(new MailAddress("[e-mail]", "Receiver"));
            message.Subject = "Email subject";
            message.Body = "Email body";

            client.Send(message);
        }
    }
}

示例二：发送带附件邮件

using System.Net;
using System.Net.Mail;

namespace Test
{
    public class EmailSender
    {
        public void SendEmailWithAttachment()
        {
            SmtpClient client = new SmtpClient();
            client.Host = "smtp.gmail.com";
            client.Port = 587;
            client.EnableSsl = true;
            client.Credentials = new NetworkCredential("username", "password");

            MailMessage message = new MailMessage();
            message.From = new MailAddress("[e-mail]", "Sender");
            message.To.Add(new MailAddress("[e-mail]", "Receiver"));
            message.Subject = "Email subject";
            message.Body = "Email body";

            Attachment attachment = new Attachment("attachment_file.docx");
            message.Attachments.Add(attachment);

            client.Send(message);
        }
    }
}

以上就是C#编程实现发送邮件的方法(可添加附件)的完整攻略，希望对你有所帮助。