问题描述
我正在使用MailKit在C＃ASP.NET MVC Framework 4.8应用程序中发送电子邮件。发送到桌面Outlook的HTML电子邮件可以很好地显示嵌入式图像。但是，当发送到Gmail网络时，嵌入式图像会附加到邮件中，并显示ggplot2文本。这是简化的代码：
reduce根据人们所说的内容（例如here），它需要一个const arr = [
{ "persentage": "30","value": "123" },{ "persentage": "27","value": "345" },{ "persentage": "2","value": "232" },"value": "343" },{ "persentage": "9","value": "4334" },{ "persentage": "6","value": "43343" },{ "persentage": "4","value": "95" }
];
const filtered = arr.reduce((acc,item,i) => {
acc.percentage += Number(item.persentage);
if (acc.percentage <= 90 && i < 6) {
acc.items.push(item);
}
return acc;
},{percentage: 0,items: []}).items;
console.log(filtered);，它在alt中变成var builder = new BodyBuilder ();
var pathImage = Path.Combine (Misc.GetPathOfExecutingAssembly (),"Image.png");
var image = builder.LinkedResources.Add (pathlogoFile);
image.ContentId = MimeUtils.GenerateMessageId ();
builder.HtmlBody = string.Format (@"<p>hey!</p><img src=""cid:{0}"">",image.ContentId);
message.Body = builder.ToMessageBody ();
（示例here）。但是，如何处理AlternativeView对象仅支持的MultipartAlternative？
谢谢。
解决方法
这是带有注释的有效解决方案；希望这对下一个人有帮助。
// Using HtmlAgilityPack
var doc = new HtmlDocument();
doc.LoadHtml(Body); // Load your html text here
// Loop over the img tags in html doc
foreach (var node in doc.DocumentNode.SelectNodes("//img"))
{
// File path to the image. We get the src attribute off the current node for the file name.
var file = Path.Combine(ImagesRootPath,node.GetAttributeValue("src",""));
if (!File.Exists(file))
{
continue;
}
// Set content type to the current image's extension,such as "png" or "jpg"
var contentType = new ContentType("image",Path.GetExtension(file));
var contentId = MimeKit.Utils.MimeUtils.GenerateMessageId();
var image = (MimePart) bodyBuilder.LinkedResources.Add(file,contentType);
image.ContentTransferEncoding = ContentEncoding.Base64;
image.ContentId = contentId;
// Set the current image's src attriubte to "cid:<content-id>"
node.SetAttributeValue("src",$"cid:" + contentId);
}
bodyBuilder.HtmlBody = doc.DocumentNode.OuterHtml;
来自两个帖子的组合：