C# 将图像嵌入System.Web.Mail.MailMessage中的电子邮件
我想使用System.Web.Mail.MailMessage和System.Web.Mail.SmtpMail类发送电子邮件。 我知道这是一个不推荐使用的类，但使用System.Net.Mail不是我的选择 到目前为止，我能够发送html格式的邮件，但在发送时无法将图像嵌入到电子邮件中 这就是我迄今为止所尝试的C# 将图像嵌入System.Web.Mail.MailMessage中的电子邮件,c#,email,C#,Email,我想使用System.Web.Mail.MailMessage和System.Web.Mail.SmtpMail类发送电子邮件。 我知道这是一个不推荐使用的类，但使用System.Net.Mail不是我的选择 到目前为止，我能够发送html格式的邮件，但在发送时无法将图像嵌入到电子邮件中 这就是我迄今为止所尝试的 private static void SendMailMethod(string mailServer, int mailServerPort, string userName, s
private static void SendMailMethod(string mailServer, int mailServerPort, string userName, string password)
{
const string SMTP_SERVER = "http://schemas.microsoft.com/cdo/configuration/smtpserver";
const string SMTP_SERVER_PORT =
"http://schemas.microsoft.com/cdo/configuration/smtpserverport";
const string SEND_USING = "http://schemas.microsoft.com/cdo/configuration/sendusing";
const string SMTP_USE_SSL = "http://schemas.microsoft.com/cdo/configuration/smtpusessl";
const string SMTP_AUTHENTICATE =
"http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";
const string SEND_USERNAME =
"http://schemas.microsoft.com/cdo/configuration/sendusername";
const string SEND_PASSWORD =
"http://schemas.microsoft.com/cdo/configuration/sendpassword";
var mailMessage = new System.Web.Mail.MailMessage();
mailMessage.Fields[SMTP_SERVER] = mailServer;
mailMessage.Fields[SMTP_SERVER_PORT] = mailServerPort;
mailMessage.Fields[SEND_USING] = 2;
mailMessage.Fields[SMTP_USE_SSL] = false;
mailMessage.Fields[SMTP_AUTHENTICATE] = 0;
mailMessage.Fields[SEND_USERNAME] = userName;
mailMessage.Fields[SEND_PASSWORD] = password;
mailMessage.From = "abc@xyz.com";
mailMessage.To = "abc@xyz.com";
mailMessage.Subject = "Test mail:";
mailMessage.BodyFormat = MailFormat.Html;
var mailAttachment = new MailAttachment("E:\\imageToEmbed.jpg");
mailMessage.Attachments.Add(mailAttachment);
mailMessage.Attachments.Add(new MailAttachment("E:\\TestAttachmentFile.txt"));
var htmlBody =
"<!DOCTYPE html PUBLIC \" -//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">" +
"<html xmlns = \"http://www.w3.org/1999/xhtml\" >" +
" <head >" +
"<meta http - equiv = \"content-type\" content = \"text/html; charset=UTF-8\" />" +
"</head >" +
"<body style = \"font-family: Segoe UI; text-align:left;\" >" +
"Following is an embedded image:" +
"<br />" +
"<img alt = \"\" src = \"imageToEmbed.jpg\" />" +
"</body >" +
"</html >";
mailMessage.Body = htmlBody;
try
{
SmtpMail.Send(mailMessage);
Console.WriteLine("Mail sent");
}
catch (Exception ex)
{
Console.WriteLine("Error:" + ex.ToString());
throw ex;
}
}
私有静态void SendMailMethod（字符串mailServer、int mailServerPort、字符串用户名、字符串密码）
{
常量字符串SMTP_服务器=”http://schemas.microsoft.com/cdo/configuration/smtpserver";
常量字符串SMTP\u服务器\u端口=
"http://schemas.microsoft.com/cdo/configuration/smtpserverport";
const string SEND_USING=”http://schemas.microsoft.com/cdo/configuration/sendusing";
常量字符串SMTP\U USE\U SSL=”http://schemas.microsoft.com/cdo/configuration/smtpusessl";
常量字符串SMTP\U身份验证=
"http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";
常量字符串发送\u用户名=
"http://schemas.microsoft.com/cdo/configuration/sendusername";
常量字符串发送密码=
"http://schemas.microsoft.com/cdo/configuration/sendpassword";
var mailMessage=new System.Web.Mail.mailMessage（）；
mailMessage.Fields[SMTP_SERVER]=mailServer；
mailMessage.Fields[SMTP_服务器_端口]=mailServerPort；
mailMessage.Fields[SEND_USING]=2；
mailMessage.Fields[SMTP\u USE\u SSL]=false；
mailMessage.Fields[SMTP_AUTHENTICATE]=0；
mailMessage.Fields[SEND_USERNAME]=用户名；
mailMessage.Fields[发送密码]=密码；
mailMessage.From=”abc@xyz.com";
mailMessage.To=”abc@xyz.com";
mailMessage.Subject=“测试邮件：”；
mailMessage.BodyFormat=MailFormat.Html；
var mailAttachment=新邮件附件（“E:\\imageToEmbed.jpg”）；
mailMessage.Attachments.Add（mailAttachment）；
mailMessage.Attachments.Add（新邮件附件（“E:\\TestAttachmentFile.txt”）；
变量htmlBody=
"" +
"" +
" " +
"" +
"" +
"" +
“以下是嵌入的图像：”+
“
”+
"" +
"" +
"";
mailMessage.Body=htmlBody；
尝试
{
SmtpMail.Send（mailMessage）；
控制台。WriteLine（“已发送邮件”）；
}
捕获（例外情况除外）
{
Console.WriteLine（“错误：+ex.ToString（））；
掷骰子；
}
}
如何将这个“imageToEmbed.jpg”嵌入到我的电子邮件中 它可能在指定的路径中找不到图像，或者它可能是一个权限问题，因此出现了损坏的图像。您需要首先检查，但是如果您要使用base64，您将拥有一个字符串中的图像 尝试将映像更改为base64
此链接可能也会有所帮助使用类
System.Web.MailSystem.Web.Mail.Message提供的包装器，不如直接切换到使用CDO COM对象。从“引用”对话框的“COM”选项卡添加对Microsoft CDO for Windows 2000库的引用
之后，您可以使用以下代码创建并发送带有嵌入图像的html电子邮件：
var cdo = new CDO.Message();
// configuration
var cfg = cdo.Configuration;
cfg.Fields[SMTP_SERVER].Value = "smtp.server.com";
cfg.Fields[SMTP_SERVER_PORT].Value = 22;
cfg.Fields[SEND_USING].Value = 2;
cfg.Fields[SMTP_USE_SSL].Value = true;
cfg.Fields[SMTP_AUTHENTICATE].Value = 1;
cfg.Fields[SEND_USERNAME].Value = "user@example.com";
cfg.Fields[SEND_PASSWORD].Value = "password";
cfg.Fields.Update();
cdo.To = "awesome@example.com";
cdo.Sender = "me@example.com";
// attachment
var cdoatt = cdo.AddAttachment("file:///E:/imageToEmbed.jpg");
//this is why System.Web.Mail can't embed images
cdoatt.Fields["urn:schemas:mailheader:content-id"].Value = Guid.NewGuid().ToString("N");
cdoatt.Fields.Update();
// get a reference to out content-id field
var cid = cdoatt.Fields["urn:schemas:mailheader:content-id"];
// notice the special layout of SRC on the image tag,
//it will be somethong like CID:123456789abcdef
cdo.HTMLBody = @"<HTML><BODY><B>CDO</B><BR /> <IMG SRC=""cid:" + cid.Value + @"""/></BODY></HTML>";
cdo.Send();
如您所见，没有添加内容ID头，也没有从.Net实现添加该头的代码路径 您的问题在这里得到了回答@photowalker，您共享的链接中的答案对我不起作用。因为我没有使用System.Net.Mail空间。我正在使用System.Web.Mail.MailMessage类发送电子邮件为什么您只限于那个过时的类？您在.Net 1.1上吗？我被限制使用这个过时的类，因为System.Net.Mail中的新类不允许我使用SSL安全性发送邮件。我已经问过了，谢谢你这么详细的回答。我已尝试使用您的解决方案，但电子邮件仍然没有显示图像。这就是我的原始电子邮件现在的样子。@krw12572嗯，奇怪，你的内容看起来还不错，即使你加了分数，我也会得到一个嵌入的图像。顺便说一句，我正在用gmail测试它。谢谢！代码正在运行。可能是以前邮件服务器的问题。它现在正在与gmail合作。
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0001_01D1AF72.C8AE8C70"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V10.0.10011.16384
This is a multi-part message in MIME format.
------=_NextPart_000_0001_01D1AF72.C8AE8C70
Content-Type: multipart/alternative;
boundary="----=_NextPart_001_0002_01D1AF72.C8AE8C70"
------=_NextPart_001_0002_01D1AF72.C8AE8C70
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
plain cdo
------=_NextPart_001_0002_01D1AF72.C8AE8C70
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
<HTML><BODY><B>plain cdo</B> <IMG SRC="cid:42"/></BODY></HTML>
------=_NextPart_001_0002_01D1AF72.C8AE8C70--
------=_NextPart_000_0001_01D1AF72.C8AE8C70
Content-Type: image/png;
name="file.png"
Content-Transfer-Encoding: base64
Content-ID: <42>
Content-Disposition: attachment;
filename="file.png"
iVBORw0KGgoAAAANSUhEUgAAADQAAABLCAMA
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0000_01D1AF70.59FC25F0"
X-Mailer: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V10.0.10011.16384
This is a multi-part message in MIME format.
------=_NextPart_000_0000_01D1AF70.59FC25F0
Content-Type: multipart/alternative;
boundary="----=_NextPart_001_0001_01D1AF70.59FC25F0"
------=_NextPart_001_0001_01D1AF70.59FC25F0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Following is an embedded image:
_____
test afterit
------=_NextPart_001_0001_01D1AF70.59FC25F0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
<!DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns = "http://www.w3.org/1999/xhtml" > <head ><meta http - equiv = "content-type" content = "text/html; charset=UTF-8" /></head ><body style = "font-family: Segoe UI; text-align:left;" ><i>Following is an embedded image:</i><br /><img alt = "" src ="<file:///file.png>"/><hr><b>test afterit</b></body ></html >
------=_NextPart_001_0001_01D1AF70.59FC25F0--
------=_NextPart_000_0000_01D1AF70.59FC25F0
Content-Type: image/png;
name="file.png"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="file.png"
iVBORw0KGgoAAAANSUhEUgAAADQAAABLCAMAAAAI0l