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string strHtml = "Your html string";
HtmlAgilityPack.HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(strHtml);
HtmlNodeCollection imgs = doc.DocumentNode.SelectNodes("//img"); //此处修改一下
string src = String.Empty;
if (imgs.Count > 0)
{
src = imgs[0].Attributes["src"].Value;
}
string strHtml = "Your html string";
HtmlAgilityPack.HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(strHtml);
HtmlNodeCollection imgs = doc.DocumentNode.SelectNodes("img");
string src = String.Empty;
if (imgs.Count > 0)
{
src = imgs[0].Attributes["src"].Value;
}