c#：发送带服务器本地图片的邮件，附件在邮件中可以不显示，比如logo图片

我们在发送邮件时，一般图片都是用网络路径，但有时如果接收方不可直接访问外网，就不能看到图片了，比如公司内部邮件，跟外界就没法交流图片。

那么我们就来把图片嵌入邮件中；查看人就没有限制了。

1。以linked的方式，此方式在邮件中不会出现图片的附件

邮件内容调用图片格式为：<img src=\"cid:Email001\">

发送邮件的服务端代码为：

SmtpClient 发送邮件的对象

折叠C# 代码

System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();
mailMessage.From="发送者邮箱";
mailMessage.To.Add("收件人邮件列表");
mailMessage.CC.Add("抄送人邮件列表");
mailMessage.Subject = subject;
AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(content,null,"text/html");
LinkedResource lrImage = new LinkedResource("a.jpg","image/gif");
lrImage.ContentId = "Email001";
htmlBody.LinkedResources.Add(lrImage);
mailMessage.AlternateViews.Add(htmlBody);
SmtpClient.Send(mailMessage);

例程：

折叠C# 代码

SmtpClient smtp = new SmtpClient();
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Host = "smtp.163.com";
smtp.Credentials = new NetworkCredential("renzhijie1111", "**");
MailMessage mm = new MailMessage();
mm.From = new MailAddress("test@163.com", "test");
mm.To.Add("test2@163.com");
mm.Subject = "测试图片邮件";
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";
mm.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));
////HTML格式邮件的内容
string htmlBodyContent = "如果你的看到这个，说明你是在以 HTML 格式查看邮件 ";
htmlBodyContent += "<a href=\"http://www.fenbi360.net粉笔编程网</a> <img src=\"cid:weblogo\">"; //注意此处嵌入的图片资源
AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");
LinkedResource lrImage = new LinkedResource(@"d:\1.jpg", "image/gif");
lrImage.ContentId = "weblogo"; //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);
mm.AlternateViews.Add(htmlBody);
////要求回执的标志
mm.Headers.Add("Disposition-Notification-To", "test@163.com");
////自定义邮件头
mm.Headers.Add("X-Website", "http://www.fenbi360.net");
////针对 LOTUS DOMINO SERVER，插入回执头
mm.Headers.Add("ReturnReceipt", "1");
mm.Priority = MailPriority.Normal; //优先级
mm.ReplyTo = new MailAddress("test2@163.com", "我自己");
////如果发送失败，SMTP 服务器将发送失败邮件告诉我
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
////异步发送完成时的处理事件
smtp.SendCompleted += new SendCompletedEventHandler(smtp_SendCompleted);
////开始异步发送
smtp.SendAsync(mm, null);
void smtp_SendCompleted(object sender, AsyncCompletedEventArgs e)
{
if (e.Cancelled)
{
MessageBox.Show("发送被取消");
}
else
{
if (e.Error == null)
{
MessageBox.Show("发送成功");
}
else
{
MessageBox.Show("发送失败： " + e.Error.Message);
}
}
}

2。以邮件附件的方式，此方式图片当附件发送，并会显示在邮件内容中。

如图：

其它代码就不多贴了。跟上面一样。只是换成附件方式：

折叠C# 代码

string htmlBodyContent = "如果你的看到这个，说明你是在以 HTML 格式查看邮件 ";
htmlBodyContent += "<a href=\"testimg\"></a> <img src=\"cid:webimg\">"; //注意此处嵌入的图片资源
System.Net.Mail.Attachment att = new Attachment(@"E:\ttt.gif");
att.ContentId = "webimg";

例程一

邮件内容调用图片格式为：<img src=\"cid:Email001\">

发送邮件的服务端代码为：

SmtpClient 发送邮件的对象 //代码省略

System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();
mailMessage.From="发送者邮箱";
mailMessage.To.Add("收件人邮件列表");
mailMessage.CC.Add("抄送人邮件列表");
mailMessage.Subject = subject;
AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(content,null,"text/html");
LinkedResource lrImage = new LinkedResource("a.jpg","image/gif");
lrImage.ContentId = "Email001";
htmlBody.LinkedResources.Add(lrImage);
mailMessage.AlternateViews.Add(htmlBody);
SmtpClient.Send(mailMessage);

--------------------------------------------------------------------------------------------------------------

例程二

SmtpClient smtp = new SmtpClient();
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Host = "smtp.163.com";
            smtp.Credentials = new NetworkCredential("renzhijie1111", "**");

            MailMessage mm = new MailMessage();
            mm.From = new MailAddress("renzhijie1111@163.com", "无敌任志杰测试");
            mm.To.Add("renzhijie1990@vip.qq.com");

mm.Subject = "发送带图片邮件";

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";
mm.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plainTextBody, null, "text/plain"));

////HTML格式邮件的内容
 string htmlBodyContent = "如果你的看到这个，说明你是在以 HTML 格式查看邮件 ";
 htmlBodyContent += "<a href=\"http://www.vayule.com/\">VA娱乐网</a> <img src=\"cid:weblogo\">"; //注意此处嵌入的图片资源
 AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(htmlBodyContent, null, "text/html");

            LinkedResource lrImage = new LinkedResource(@"d:\1.jpg", "image/gif");
            lrImage.ContentId = "weblogo"; //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);

mm.AlternateViews.Add(htmlBody);

////要求回执的标志
mm.Headers.Add("Disposition-Notification-To", "renzhijie1111@163.com");

////自定义邮件头
mm.Headers.Add("X-Website", "http://www.vayule.com/");

////针对 LOTUS DOMINO SERVER，插入回执头
mm.Headers.Add("ReturnReceipt", "1");

mm.Priority = MailPriority.Normal; //优先级
mm.ReplyTo = new MailAddress("renzhijie1111@163.com", "我自己");

////如果发送失败，SMTP 服务器将发送失败邮件告诉我
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

////异步发送完成时的处理事件
smtp.SendCompleted += new SendCompletedEventHandler(smtp_SendCompleted);

            ////开始异步发送
            smtp.SendAsync(mm, null);

void smtp_SendCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                MessageBox.Show("发送被取消");
            }
            else
            {
                if (e.Error == null)
                {
                    MessageBox.Show("发送成功");
                }
                else
                {
                    MessageBox.Show("发送失败： " + e.Error.Message);
                }
            }
        }

使用SMTP发送邮件
发送的邮件为本地html文件，html中的图片为本地图片

主体函数，根据传入的bool参数发送不同的模板

internal class FeedbackMail
{
    public MailMessage mailMessage = new MailMessage();
    public SmtpClient smtpClient;
    public int senderPort = 587;
    public String senderServerHost = "mail.abc.com";
    public String senderPassword = "abc";
    public String senderUsername = "aaa";

    public void SendMail(Boolean isSuccess)
    {
        String[] members = XmlReader.GetElementFromXml("SendMailTo").Split(';');
        foreach (var member in members)
        {
            mailMessage.To.Add(member);
        }
        mailMessage.From = new MailAddress("abc@abc.com");
        mailMessage.Subject = "EmailTest";
        AlternateView htmlBody;
        if (isSuccess)
        {
            var reader = new StreamReader(@"C:\MailForSuccess.html", Encoding.Default);
            var mailBody = reader.ReadToEnd().ToString();
            htmlBody = AlternateView.CreateAlternateViewFromString(mailBody, null, "text/html");
        }
        else
        {
            var reader = new StreamReader(@"C:\MailForFailure.html", Encoding.Default);
            var mailBody = reader.ReadToEnd().ToString();
            htmlBody = AlternateView.CreateAlternateViewFromString(mailBody, null, "text/html");
        }
        LinkedResource lrImage = new LinkedResource(@"C:\AvePoint.png", "image/gif");
        LinkedResource lrImage2 = new LinkedResource(@"C:\MSPartner.png", "image/gif");
        lrImage.ContentId = "AvePoint";
        lrImage2.ContentId = "MSPartner";
        htmlBody.LinkedResources.Add(lrImage);
        htmlBody.LinkedResources.Add(lrImage2);
        mailMessage.AlternateViews.Add(htmlBody);
        mailMessage.IsBodyHtml = true;
        mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
        mailMessage.Priority = MailPriority.Normal;
        Send();
    }

    public void Send()
    {
        try
        {
            if (mailMessage != null)
            {
                smtpClient = new SmtpClient();
                smtpClient.Host = senderServerHost;
                smtpClient.Port = senderPort;
                smtpClient.UseDefaultCredentials = false;

                smtpClient.Credentials = new System.Net.NetworkCredential(senderUsername, senderPassword);

                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtpClient.Send(mailMessage);
                Console.WriteLine("Send Success");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Send Fail");
            Console.WriteLine(ex.Message);
        }
    }
}