Question

我试图在HTML邮件中添加图片。当我将正文保存为 html文件时，它会显示，但是当我通过 GMail发送 html正文作为电子邮件时 strong>，图像不显示。谁能告诉我原因？

我以这种方式设置图像的来源：

var image = body.GetElementsByTagName("img");
string imageAttachmentPath = Path.Combine(Globals.NotificationTemplatesPath, "Header.png");
foreach (XmlElement img in image)
{
    img.SetAttribute("src", imageAttachmentPath);
    break;
}

//thats the method in which i am sending email.

public static void SendMessageViaEmailService(string from, 
                                              string sendTo, 
                                              string carbonCopy,
                                              string blindCarbonCopy, 
                                              string subject, 
                                              string body, 
                                              bool isBodyHtml,
                                              string imageAttachmentPath, 
                                              Hashtable images, 
                                              List<string> attachment, 
                                              string title = null, 
                                              string embeddedImages = null)
{
    Attachment image = new Attachment(imageAttachmentPath);
    MailMessage msg  = new MailMessage();
    msg.IsBodyHtml   = true;                   // email body will allow html elements
    msg.From = new MailAddress(from, "Admin"); // setting the Sender Email ID
    msg.To.Add(sendTo);                        // adding the Recipient Email ID

    if (!string.IsNullOrEmpty(carbonCopy))     // add CC email ids if supplied.
        msg.CC.Add(carbonCopy);

    msg.Subject = subject;                     //setting email subject and body
    msg.Body = body;
    msg.Attachments.Add(image);

    //create a Smtp Mail which will automatically get the smtp server details 
    //from web.config mailSettings section
    SmtpClient SmtpMail = new SmtpClient();
    SmtpMail.Host = "smtp.gmail.com";
    SmtpMail.Port = 587;
    SmtpMail.EnableSsl = true;
    SmtpMail.UseDefaultCredentials = false;
    SmtpMail.Credentials = new System.Net.NetworkCredential(from, "password");

    // sending the message.
    try
    {
        SmtpMail.Send(msg);
    }
    catch (Exception ex) { }
}

Answer 1

您的图片SRC属性很可能不是绝对的，可公开访问的URI。任何文件系统或本地URI都不会在电子邮件中显示图像。

具体来说，这些不起作用：

c://test.png
test.png
/folder/test.png
http://localhost/test.png
http://internaldomain/test.png

确保您的图片网址

绝对（即以类似http://的协议开始）
包含图片的完整路径
域名是公共域名

Answer 2

尝试this thread中的代码部分：

// creating the attachment
System.Net.Mail.Attachment inline = new System.Net.Mail.Attachment(@"c:\\test.png");
inline.ContentDisposition.Inline = true;
// sending the message
MailMessage email = new MailMessage();
// set the information of the message (subject, body ecc...)

// send the message
System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("localhost");
smtp.Send(email);
email.Dispose();

为什么图像不在gmail的html邮件中显示？

2 个答案: