C#实现发送邮件的三种方法

具体的C#实现发送邮件的三种方法攻略如下：

一、使用SMTP客户端库发送邮件

步骤：

1. 引用System.Net.Mail命名空间

csharp
using System.Net.Mail;

1. 创建SmtpClient对象，并设置邮件服务器和端口号等相关信息

csharp
SmtpClient smtpClient = new SmtpClient("smtp.example.com", 25);
smtpClient.Credentials = new NetworkCredential("username", "password");
smtpClient.EnableSsl = true;

1. 创建MailMessage对象，设置邮件的发送者、接收者、主题、正文等相关信息

csharp
MailMessage mailMessage = new MailMessage();
mailMessage.From = new MailAddress("[e-mail]");
mailMessage.To.Add("[e-mail]");
mailMessage.To.Add("[e-mail]");
mailMessage.Subject = "C#实现发送邮件的三种方法";
mailMessage.Body = "这是一封测试邮件。";
mailMessage.IsBodyHtml = false;
mailMessage.Priority = MailPriority.Normal;

1. 使用SmtpClient对象的Send方法发送邮件

csharp
smtpClient.Send(mailMessage);

示例：

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            SmtpClient smtpClient = new SmtpClient("smtp.example.com", 25);
            smtpClient.Credentials = new NetworkCredential("username", "password");
            smtpClient.EnableSsl = true;

            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress("[e-mail]");
            mailMessage.To.Add("[e-mail]");
            mailMessage.To.Add("[e-mail]");
            mailMessage.Subject = "C#实现发送邮件的三种方法";
            mailMessage.Body = "这是一封测试邮件。";
            mailMessage.IsBodyHtml = false;
            mailMessage.Priority = MailPriority.Normal;

            smtpClient.Send(mailMessage);
        }
    }
}

二、使用自带的MailMessage类发送邮件

步骤：

1. 引用System.Web.Mail命名空间

csharp
using System.Web.Mail;

1. 创建MailMessage对象，并设置邮件的发送者、接收者、主题、正文等相关信息

csharp
MailMessage mailMessage = new MailMessage();
mailMessage.From = "[e-mail]";
mailMessage.To = "[e-mail];[e-mail]";
mailMessage.Subject = "C#实现发送邮件的三种方法";
mailMessage.Body = "这是一封测试邮件。";
mailMessage.Priority = MailPriority.Normal;

1. 使用SmtpMail类的Send方法发送邮件

csharp
SmtpMail.SmtpServer = "smtp.example.com";
SmtpMail.Send(mailMessage);

示例：

using System.Web.Mail;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            MailMessage mailMessage = new MailMessage();
            mailMessage.From = "[e-mail]";
            mailMessage.To = "[e-mail];[e-mail]";
            mailMessage.Subject = "C#实现发送邮件的三种方法";
            mailMessage.Body = "这是一封测试邮件。";
            mailMessage.Priority = MailPriority.Normal;

            SmtpMail.SmtpServer = "smtp.example.com";
            SmtpMail.Send(mailMessage);
        }
    }
}

三、使用自定义的SMTP客户端类发送邮件

步骤：

1. 创建自定义的SMTP客户端类，继承自SmtpClient类，并重写Send方法

```csharp
public class CustomSmtpClient : SmtpClient
{
public CustomSmtpClient(string host, int port, string username, string password)
{
this.Host = host;
this.Port = port;
this.Credentials = new NetworkCredential(username, password);
this.EnableSsl = true;
}

   public void Send(string sender, string recipient, string subject, string body)
   {
       MailMessage mailMessage = new MailMessage();
       mailMessage.From = new MailAddress(sender);
       mailMessage.To.Add(recipient);
       mailMessage.Subject = subject;
       mailMessage.Body = body;
       mailMessage.IsBodyHtml = false;
       mailMessage.Priority = MailPriority.Normal;

       this.Send(mailMessage);
   }

}
```

1. 创建自定义的SMTP客户端对象，并调用Send方法发送邮件

csharp
CustomSmtpClient customSmtpClient = new CustomSmtpClient("smtp.example.com", 25, "username", "password");
customSmtpClient.Send("[e-mail]", "[e-mail]", "C#实现发送邮件的三种方法", "这是一封测试邮件。");

示例：

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

namespace ConsoleApp1
{
    public class CustomSmtpClient : SmtpClient
    {
        public CustomSmtpClient(string host, int port, string username, string password)
        {
            this.Host = host;
            this.Port = port;
            this.Credentials = new NetworkCredential(username, password);
            this.EnableSsl = true;
        }

        public void Send(string sender, string recipient, string subject, string body)
        {
            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress(sender);
            mailMessage.To.Add(recipient);
            mailMessage.Subject = subject;
            mailMessage.Body = body;
            mailMessage.IsBodyHtml = false;
            mailMessage.Priority = MailPriority.Normal;

            this.Send(mailMessage);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            CustomSmtpClient customSmtpClient = new CustomSmtpClient("smtp.example.com", 25, "username", "password");
            customSmtpClient.Send("[e-mail]", "[e-mail]", "C#实现发送邮件的三种方法", "这是一封测试邮件。");
        }
    }
}

以上就是C#实现发送邮件的三种方法的完整攻略，希望对您有所帮助。