如何使用 .NET 在电子邮件正文中嵌入多个图像 [英] How to embed multiple images in email body using .NET
问题描述
我正在编写一个程序，该程序向用户发送电子邮件，其中嵌入了电子邮件正文 (HTML) 中的多个图像(图表).
I'm writing a program that sends emails to users with multiple images (charts) embedded in the Email message body (HTML).
当我尝试位于此处的示例时..当我只需要嵌入一张图像时效果很好http://www.systemnetmail.com/faq/4.4.aspx.
When I tried the sample located here..which worked well when I have to embed only one image http://www.systemnetmail.com/faq/4.4.aspx.
但是，当我尝试使用以下代码嵌入多个图像时，没有嵌入任何图像，而是将它们作为附件发送.
But, when i tried to embed multiple images using the below code, none of the images are being embedded , instead they are sent as attachments.
public MailMessage MailMessage(Metric metric, DateTime date)
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("test@gmail.com", "User1");
msg.To.Add(new MailAddress("test@gmail.com"));
msg.Subject = "Trend for metric: " + metric.Name;
msg.IsBodyHtml = true;
// Generate the charts for the given metric
var charts = this.GenerateCharts(metric, date);
int i = 0;
string htmlBody = "<html><body>";
List<LinkedResource> resources = new List<LinkedResource>();
foreach (var chart in charts)
{
string imageTag = string.Format("<img src=cid:chart{0} /><br>", i);
htmlBody += imageTag;
LinkedResource graph = new LinkedResource(chart.Value, "image/jpeg");
graph.ContentId = "chart" + i;
resources.Add(graph);
i++;
}
htmlBody += "</body></html>";
// Alternate view for embedded images
AlternateView avText = AlternateView.CreateAlternateViewFromString(metric.Name, null, MediaTypeNames.Text.Html);
AlternateView avImages = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);
// Add all the images as linked resources
resources.ForEach(x => avImages.LinkedResources.Add(x));
// Add the views for image
msg.AlternateViews.Add(avText);
msg.AlternateViews.Add(avImages);
return msg;
}
有什么我遗漏的线索吗?我检查了 .htm 文件，该文件也作为电子邮件的附件发送，html 源代码如下:
Any clues as what I'm missing? I checked the .htm file which is also sent as attachment with the email, and html source looks as follows:
<html>><body><img src=cid:chart0 /><br><img src=cid:chart1 /><br><img src=cid:chart2/><br><img src=cid:chart3 /><br><img src=cid:chart4 /><br></body></html>
所以 Q 是如何在 html body 中发送多个图像，而不是作为附件.
So the Q is how to send multiple images in the html body , not as attachment.
推荐答案
所以，我想弄清楚实际问题是什么它在这一行
So, I think figured out what the actual problem is Its in this line
// Alternate view for embedded images
AlternateView avText = AlternateView.CreateAlternateViewFromString(metric.Name, null, MediaTypeNames.Text.Html);
AlternateView avImages = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);
如您所见，我的两个视图都指定为 Text.Html，因此第一个视图覆盖了下一个视图，因此我只看到文本和图像作为附件发送
As you can see, both my views are specified as Text.Html, so the the 1st one is overriding the next one and so I only see text and images are sent as attachments
我进行了以下更改并按预期工作
I made the following change and it worked as expected
AlternateView avText = AlternateView.CreateAlternateViewFromString(metric.Name, null, **MediaTypeNames.Text.Plain**);
AlternateView avImages = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);
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