从asp.net c＃net.mail作为mail.body发送后，图像未显示在gmail邮件正文中
[英]Image not showing in gmail mail body after sending it from asp.net c# net.mail as mail.body
问题描述
I need to send the qrcode generated from the email to his gmail account. 
我需要将通过电子邮件生成的二维码发送到他的gmail帐户。 I debugged the code and checked with html visualizer and the qrcode is displaying correctly but cannot see it in gmail message 我调试了代码，并用html可视化工具进行了检查，qrcode显示正确，但在gmail消息中看不到它
public void generate_qrcode()
{
try
{
string imgurl;
string code = txtCode.Text;
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
imgBarCode.Height = 150;
imgBarCode.Width = 150;
using (Bitmap bitMap = qrCode.GetGraphic(20))
{
using (MemoryStream ms = new MemoryStream())
{
bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] byteImage = ms.ToArray();
imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
imgurl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
}
//plBarCode.Controls.Add(imgBarCode);
}
SendMail(imgurl);
}
catch (Exception ex)
{
}
}
public void SendMail(String imgurl)
{
string body = "Hello ,<br /><br />Please find your QRcode below<br /><br /><img src=' " + imgurl + " ' height='100' width='100'/><br/><br/>Thanks...";
SmtpClient Smtp_Server = new SmtpClient();
MailMessage e_mail = new MailMessage();
Smtp_Server.UseDefaultCredentials = false;
Smtp_Server.Credentials = new System.Net.NetworkCredential("samplemail527@gmail.com", "Sample527");
Smtp_Server.Port = 587;
Smtp_Server.EnableSsl = true;
Smtp_Server.Host = "smtp.gmail.com";
e_mail = new MailMessage();
e_mail.From = new MailAddress("samplemail527@gmail.com");
e_mail.To.Add(txtCode.Text);
e_mail.Subject = "Email Sending";
e_mail.IsBodyHtml = true;
e_mail.Body = body;
Smtp_Server.Send(e_mail);
}
3 个解决方案
解决方案1
2 已采纳 2018-09-14 12:41:27
Base64 images are currently not supported by most email readers. 大多数电子邮件阅读器当前不支持Base64图像。 Very unfortunate. 非常不幸 You'll need to generate an actual image and attach it to the message with a unique id (like a GUID) and then use that ID as the image tag's src along with the CID prefix. 您需要生成一个实际的图像，并将其附加到具有唯一ID（例如GUID）的消息上，然后将该ID与CID前缀一起用作图像标签的src。
<img src="cid:GeneratedUniqueId" alt="Your QR Code" />
解决方案2
0 2018-09-14 12:26:04
Here is the good reference to embed image in an email. 这是在电子邮件中嵌入图像的良好参考。 Send Email with embedded Images 发送带有嵌入式图像的电子邮件
解决方案3
0 2018-11-23 11:12:36
Maybe you should try to use AlternateView. 也许您应该尝试使用AlternateView。 You have to assign an Id to a resource and use that id within HTML <img> tag. 您必须为资源分配一个ID，并在HTML <img>标记内使用该ID。 The src attribute should address this Id.Like so: src属性应解决此ID，就像这样：
<img src="cid:ResourceId" />
Don't forget to add linked resource to alternate view. 不要忘记将链接的资源添加到备用视图。
Here is the full code I used: 这是我使用的完整代码：
Byte[] iconBytes = Convert.FromBase64String(@"iVBOR IMAGE BYTES Hy4vAAN==");
System.IO.MemoryStream iconBitmap = new System.IO.MemoryStream(iconBytes);
LinkedResource iconResource = new LinkedResource(iconBitmap, MediaTypeNames.Image.Jpeg);
iconResource.ContentId = "Icon";
MailMessage msg = new MailMessage();
msg.IsBodyHtml = true;
msg.To.Add(new MailAddress("recipient@domain.com", "Recipient Name"));
msg.From = new MailAddress("sender@domain.com", "Sender Name");
msg.Subject = "Attach image to mail";
string htmlBody = @"<html><head>";
htmlBody += @"<style>";
htmlBody += @"body{ font-family:'Calibri',sans-serif; }";
htmlBody += @"</style>";
htmlBody += @"</head><body>";
htmlBody += @"<h1>The attached image is here below</h1>";
htmlBody += @"<img src='cid:" + iconResource.ContentId + @"'/>";
htmlBody += @"</body></html>";
AlternateView alternativeView = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);
alternativeView.LinkedResources.Add(iconResource);
msg.AlternateViews.Add(alternativeView);
SmtpClient client = new SmtpClient();
client.UseDefaultCredentials = true;
client.Port = 25; // You can use Port 25 if 587 is blocked
client.Host = "smtp.yourhost.com";
client.Send(msg);
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