C# MVC框架如何实现邮件发送

在C# MVC框架中实现邮件发送，通常需要以下几个步骤：

1. 添加邮件发送库：首先，你需要一个邮件发送库，例如Nuget包中的"System.Net.Mail"。在你的项目中安装这个包，以便使用它来发送邮件。

2. 配置邮件发送设置：在你的应用程序的配置文件（如web.config或appsettings.json）中，添加邮件发送所需的设置，例如SMTP服务器的地址、端口、凭据等。

<!-- web.config -->
<system.net>
  <mailSettings>
    <smtp from="your_email@example.com" deliveryMethod="Network">
      <network host="smtp.example.com" port="587" userName="your_username" password="your_password" />
    </smtp>
  </mailSettings>
</system.net>

或

// appsettings.json
{
  "MailSettings": {
    "Smtp": {
      "From": "your_email@example.com",
      "DeliveryMethod": "Network",
      "Host": "smtp.example.com",
      "Port": 587,
      "UserName": "your_username",
      "Password": "your_password"
    }
  }
}

3. 创建邮件发送服务：创建一个邮件发送服务类，用于封装邮件发送的逻辑。这个类可以使用依赖注入（DI）来注入邮件设置。

public interface IEmailService
{
    Task SendEmailAsync(string to, string subject, string body);
}

public class EmailService : IEmailService
{
    private readonly SmtpClient _smtpClient;

    public EmailService(IOptions<MailSettings> mailSettings)
    {
        _smtpClient = new SmtpClient(mailSettings.Value.Smtp.Host, mailSettings.Value.Smtp.Port)
        {
            Credentials = new NetworkCredential(mailSettings.Value.Smtp.UserName, mailSettings.Value.Smtp.Password),
            EnableSsl = true
        };
    }

    public async Task SendEmailAsync(string to, string subject, string body)
    {
        var mailMessage = new MailMessage
        {
            From = new MailAddress(mailSettings.Value.Smtp.From),
            Subject = subject,
            Body = body
        };

        mailMessage.To.Add(to);

        await _smtpClient.SendMailAsync("your_email@example.com", to, mailMessage);
    }
}

4. 在控制器中使用邮件发送服务：在你的MVC控制器中，使用依赖注入来注入邮件发送服务，并在需要发送邮件的地方调用它。

public class HomeController : Controller
{
    private readonly IEmailService _emailService;

    public HomeController(IEmailService emailService)
    {
        _emailService = emailService;
    }

    public async Task<IActionResult> Contact()
    {
        var model = new ContactViewModel
        {
            To = "recipient@example.com",
            Subject = "Contact Form Submission",
            Body = "Name: " + Model.Name + "\nEmail: " + Model.Email + "\nMessage: " + Model.Message
        };

        await _emailService.SendEmailAsync(model.To, model.Subject, model.Body);

        return View();
    }
}

这样，你就可以在C# MVC框架中实现邮件发送功能了。当然，你可以根据需要对这个过程进行定制和优化。