在 c# 中动态分配 ContentId 并发送带有嵌入图像的电子邮件
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【中文标题】在 c# 中动态分配 ContentId 并发送带有嵌入图像的电子邮件【英文标题】：Dynamically assign ContentId and send email with embedded images in c# 【发布时间】：2015-10-16 15:45:03 【问题描述】：如何在 c# 中动态分配带有内容 id 的 src How to embed multiple images in email body using .NET 但没有得到好主意。 当我提交时，我将能够获取 html 源以及如何动态分配 cid
> >
> > <html>><body><img src="~/Upload/1.jpg"><br><img src="~/Upload/1.jpg" /><br><img
> src="~/Upload/3.jpg"/><br><br>
> > thanks!!!</body></html>
需要转换 我想发送包含多张图片的电子邮件
<html>><body><img src=cid:c1 /><br><img src=cid:c2 /><br><img
src=cid:c3/><br><br>
thanks!!!</body></html>
然后
if (htmlString == null) return null;
var doc = new HtmlDocument();
doc.LoadHtml(htmlString);
HtmlNodeCollection nodes = doc.DocumentNode.SelectNodes("//img");
if (nodes == null) return null;
foreach (HtmlNode node in nodes)
if (node.Attributes.Contains("src"))
string data = node.Attributes["src"].Value;
string base64Data = Regex.Match(data, @"data:image/(?<type>.+?),(?<data>.+)").Groups["data"].Value;
if (base64Data != "")
string cid = Guid.NewGuid().ToString();
byte[] binData = Convert.FromBase64String(base64Data);
var stream = new MemoryStream(binData);
string contenttype = "image/" +
Regex.Match(data, @"data:image/(?<type>.+?);(?<data>.+)").Groups["type"]
.Value;
var inline = new Attachment(stream, new ContentType(contenttype));
inline.ContentDisposition.Inline = true;
inline.ContentDisposition.DispositionType = DispositionTypeNames.Inline;
inline.ContentId = cid;
inline.ContentType.MediaType = contenttype;
mailMessage.Attachments.Add(inline);
node.Attributes["src"].Value = "cid:" + cid;
动态分配和添加链接资源和替代视图的任何好主意， 给定的代码适用于静态情况
string path = System.Web.HttpContext.Current.Server.MapPath("~/images/Logo.jpg"); // my logo is placed in images folder
//var path=""
var logo = new LinkedResource(path);
logo.ContentId = "companylogo";
logo.ContentType = new ContentType("image/jpeg");
//now do the HTML formatting
AlternateView av1 = AlternateView.CreateAlternateViewFromString(
"<html><body><img src=cid:companylogo/>" +
"<br></body></html>" + strMailContent,
null, MediaTypeNames.Text.Html);
//now add the AlternateView
av1.LinkedResources.Add(logo);
//now append it to the body of the mail
msg.AlternateViews.Add(av1);
【问题讨论】：
请提及你的想法@john 【参考方案1】：这是为您提供的完整解决方案。
string inputHtmlContent = "<Your Html Content containing images goes here>";
string outputHtmlContent = string.Empty;
var myResources = new List<LinkedResource>();
if ((!string.IsNullOrEmpty(inputHtmlContent)))
var doc = new HtmlDocument();
doc.LoadHtml(inputHtmlContent);
HtmlNodeCollection nodes = doc.DocumentNode.SelectNodes("//img");
if (nodes !=null)
foreach (HtmlNode node in nodes)
if (node.Attributes.Contains("src"))
string data = node.Attributes["src"].Value;
string imgPath = System.Web.HttpContext.Current.Server.MapPath(data);
var imgLogo = new LinkedResource(imgPath);
imgLogo.ContentId = Guid.NewGuid().ToString();
imgLogo.ContentType = new ContentType("image/jpeg");
myResources.Add(imgLogo);
node.Attributes["src"].Value = string.Format("cid:0", imgLogo.ContentId);
outputHtmlContent = doc.DocumentNode.OuterHtml;
else
outputHtmlContent = inputHtmlContent;
AlternateView av2 = AlternateView.CreateAlternateViewFromString(outputHtmlContent,
null, MediaTypeNames.Text.Html);
foreach (LinkedResource linkedResource in myResources)
av2.LinkedResources.Add(linkedResource);
var msg = new MailMessage();
msg.AlternateViews.Add(av2);
msg.IsBodyHtml = true;
<-- Enter Other required Informations and send mail -->
...
【讨论】：
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