c# - 如何对 html 字符串使用 String.Replace 方法

Question

我在字符串变量中有 html 代码。因为我有多个图像标签，我想用新的 src 替换图像标签的 src。

我正在使用此代码:

    foreach (MessagePart attchment in unseenMessage.FindAllAttachments())
    {
         attchments =  Guid.NewGuid().ToString() + attchment.FileName;
         string src="cid:"+ attchment.ContentId;
         string newsrc = "/Attachment/" + attchments;
         emailbody.Replace(src, newsrc);
         string filepath = "D:\\AceoCRM\\Aceo.Web\\Attachment\\" + attchments;
         using (FileStream fs = new FileStream(filepath, FileMode.CreateNew))
         {

              fs.Write(attchment.Body, 0, attchment.Body.Length);
              fs.Close();
         }
         listOfAttachments.Add(attchments);
    }

Answer 1

您可以使用 HtmlAgilityPack解析和替换标记内部 html 和图像源。

编辑:示例:替换 src

var documnet = new HtmlDocument();
documnet.LoadHtml("HtmlString");
foreach (var href in documnet.DocumentNode.Descendants("img").Where(href => !href.OuterHtml.Trim().Contains("http")))
{
     try
     {
          //here image src URL being changed...
          href.Attributes["src"].Value = href.Attributes["src"].Value.Trim().StartsWith("//") ? String.Format("http:{0}", href.Attributes["src"].Value.Trim()) : String.Format("{0}/{1}", baseUrl, href.Attributes["src"].Value.TrimFromStart("//"));
          href.Attributes["srcset"].Value = href.Attributes["srcset"].Value.Trim().StartsWith("//") ? String.Format("http:{0}", href.Attributes["srcset"].Value.Trim()) : String.Format("{0}/{1}", baseUrl, href.Attributes["srcset"].Value.TrimFromStart("//"));
     }
     catch (NullReferenceException ex)
     {
         Log(ex);
     }
}