ASP.NET中使用System.Net.Mail发邮件

一、一般的邮件发送

public static void SendMail()//普通的邮件发送
{
    MailAddress from = new MailAddress("FromEmail@website.com");
    MailAddress to = new MailAddress("ToEmail@website.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "邮件标题";
    message.Body = "邮件内容";
    MailAddress copy = new MailAddress("mailto:CopyToEmail@website.com");
    message.CC.Add(copy);
    SmtpClient client = new SmtpClient("SMTP Server");

    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

二、带HTML格式的Email发送

public static void SendMail()//带HTML的邮件发送
{
    MailAddress from = new MailAddress("FromEmail@website.com");
    MailAddress to = new MailAddress("ToEmail@website.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "邮件标题";

    string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
    message.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));
    string htmlBodyContent = "如果你的看到<b>这个</b>，说明你是在以 <span style=\"color:red\">HTML</span> 格式查看邮件<br><br>";
    htmlBodyContent += "<a href=\"http://www.baidu.com//">百度一下</a>";
    AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");
    message.AlternateViews.Add(htmlBody);

    MailAddress copy = new MailAddress("mailto:CopyToEmail@website.com ");
    message.CC.Add(copy);
    SmtpClient client = new SmtpClient("SMTP Server");

    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

三、带附件的邮件

public static void SendMail()//带HTML的邮件发送
{
    MailAddress from = new MailAddress("FromEmail@website.com");
    MailAddress to = new MailAddress("ToEmail@website.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "邮件标题";

    string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
    message.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));
    string htmlBodyContent = "如果你的看到<b>这个</b>，说明你是在以 <span style=\"color:red\">HTML</span> 格式查看邮件<br><br>";
    htmlBodyContent += "<a href=\"http://www.baidu.com//">百度一下</a>";
    AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");
    message.AlternateViews.Add(htmlBody);

    Attachment attachment = new Attachment("C:\\附件.rar");
    message.Attachments.Add(attachment);

    MailAddress copy = new MailAddress("mailto:CopyToEmail@website.com");
    message.CC.Add(copy);
    SmtpClient client = new SmtpClient("SMTP Server");

    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

四、邮件为HTML，而且带图片

public static void SendMail()//带HTML，并且HTML中有图片的邮件发送
{
    MailAddress from = new MailAddress("FromEmail@website.com");
    MailAddress to = new MailAddress("ToEmail@website.com");

    MailMessage message = new MailMessage(from, to);
    message.Subject = "邮件标题";

    string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
    message.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));
    string htmlBodyContent = "如果你的看到<b>这个</b>，说明你是在以 <span style=\"color:red\">HTML</span> 格式查看邮件<br><br>";
    htmlBodyContent += "<a href=\"http://www.baidu.com//">百度一下</a><img src=\"cid:imageInEmail\"/>";
    AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");
   
    LinkedResource lrImage = new LinkedResource("C:\\图片.jpg", System.Net.Mime.MediaTypeNames.Image.Jpeg);
    lrImage.ContentId = "imageInEmail"; //此处的ContentId 对应 htmlBodyContent 内容中的 cid: ,如果设置不正确,请不会显示图片
    htmlBody.LinkedResources.Add(lrImage);

    message.AlternateViews.Add(htmlBody);

    MailAddress copy = new MailAddress("mailto:CopyToEmail@website.com");
    message.CC.Add(copy);
    SmtpClient client = new SmtpClient("SMTP Server");

    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

五、图片为动态生成

public static void SendMail()//带HTML，并且HTML中有图片的邮件发送
{
    MailAddress from = new MailAddress("FromEmail@website.com");
    MailAddress to = new MailAddress("ToEmail@website.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "邮件标题";

    string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
    message.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));
    string htmlBodyContent = "如果你的看到<b>这个</b>，说明你是在以 <span style=\"color:red\">HTML</span> 格式查看邮件<br><br>";
    htmlBodyContent += "<a href=\"http://www.baidu.com//">百度一下</a><img src=\"cid:imageInEmail\"/>";
    AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");

    MemoryStream imgStream = GetImage();
    imgStream.Position = 0;//非常重要，否则图片为空！在邮件里显示红叉
    LinkedResource lrImage = new LinkedResource(imgStream, System.Net.Mime.MediaTypeNames.Image.Jpeg);
    lrImage.ContentId = "imageInEmail"; //此处的ContentId 对应 htmlBodyContent 内容中的 cid: ，如果设置不正确，请不会显示图片
    htmlBody.LinkedResources.Add(lrImage);

    message.AlternateViews.Add(htmlBody);

    MailAddress copy = new MailAddress("mailto:CopyToEmail@website.com");
    message.CC.Add(copy);
    SmtpClient client = new SmtpClient("SMTP Server");

    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

public static MemoryStream GetImage()
{
    //Code here... ...
}