如何對HTML字符串使用String.Replace方法

Question

我在字符串變量中有html代碼。 因為我有多個圖像標簽，所以我想用新的src替換圖像標簽的src。

我正在使用此代碼：

    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解析和替換內部html和圖像源中的標簽。

編輯：示例：替換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);
     }
}