private static IHtmlDocument ParseDocument(HtmlParserResult result, string htmlContent, Uri url)
{
var parser = result.Parser;
var document = parser.Parse(htmlContent, url);
if (result.Provider != null)
{
result.Provider.ReleaseParser(parser);
}
return(document);
}
/// <summary>
/// 分析 HTML 文档，此方法会根据情况缓存文档模型
/// </summary>
/// <param name="context">当前请求的 HttpContext 对象</param>
/// <param name="contentResult">文档加载结果</param>
/// <param name="parserResult">解析器选择结果</param>
/// <returns>HTML 文档对象</returns>
public static IHtmlDocument ParseDocument(HttpContextBase context, HtmlContentResult contentResult, HtmlParserResult parserResult)
{
if (contentResult.CacheKey != null && parserResult.DomProvider != null)//如果可以缓存
{
var key = contentResult.CacheKey;
var cacheKey = string.Format(CultureInfo.InvariantCulture, DocumentCacheKey, contentResult.ContentUri.AbsoluteUri);
var createDocument = Cache.Get(cacheKey) as Func <IHtmlDomProvider, IHtmlDocument>;
if (createDocument != null)
{
var provider = parserResult.DomProvider;
return(createDocument(provider));
}
context.Trace.Write("Jumony for ASP.NET", "Document cache missed");
var document = ParseDocument(parserResult, contentResult.Content, contentResult.ContentUri);
createDocument = document.Compile();//必须同步编译文档，否则文档对象可能被修改。
new Action(delegate
{
createDocument(parserResult.DomProvider);//可以异步预热，预热后再存入缓存。
Cache.Insert(cacheKey, createDocument, new CacheDependency(new string[0], new[] { key }), CacheItemPriority.High);
}
).BeginInvoke(null, null);//立即在新线程预热此方法
return(document);
}
else
{
return(ParseDocument(parserResult, contentResult.Content, contentResult.ContentUri));
}
}