/// <summary>
/// 派生类可以重写此方法自定义加载虚拟路径处的文档的逻辑
/// </summary>
/// <returns></returns>
protected virtual IHtmlDocument LoadDocument(string virtualPath, out CacheDependency cacheDependency)
{
string cacheKey;
var document = HtmlServices.LoadDocument(virtualPath, out cacheKey);
if (cacheKey != null)
{
cacheDependency = new CacheDependency(new string[0], new string[] { cacheKey });
}
else
{
cacheDependency = HtmlServices.CreateCacheDependency(virtualPath);
}
return(document);
}
/// <summary>
/// 在 HTML 文档中查找 ViewHandler 路径设置。
/// </summary>
/// <param name="virtualPath">要处理的 HTML 文档的虚拟路径</param>
/// <returns>用于处理 HTML 的视图处理程序路径</returns>
public static string GetHandlerPath(string virtualPath)
{
var cacheKey = handlerPathCachePrefix + virtualPath;
var cacheItem = HttpRuntime.Cache.Get(cacheKey) as HandlerPathCacheItem;
if (cacheItem == null)
{
string cacheDependencyKey;
var document = HtmlServices.LoadDocument(virtualPath, out cacheDependencyKey);
if (document == null)
{
return(null);
}
var head = document.FindFirstOrDefault("head");
if (head == null)
{
return(null);
}
var handlerMeta = head.FindFirstOrDefault("meta[name=handler]");
if (handlerMeta == null)
{
return(null);
}
var handlerPath = handlerMeta.Attribute("value").Value();
if (cacheDependencyKey != null)
{
cacheItem = new HandlerPathCacheItem()
{
HandlerPath = handlerPath
};
HttpRuntime.Cache.Insert(cacheKey, cacheItem, new CacheDependency(new string[0], new[] { cacheDependencyKey }));
}
}
return(cacheItem.HandlerPath);
}
/// <summary>
/// 派生类重写此方法自定义加载文档的逻辑
/// </summary>
/// <param name="virtualPath">文档的虚拟路径</param>
/// <returns>加载的文档对象</returns>
protected virtual IHtmlDocument LoadDocument(string virtualPath)
{
IHtmlDocument document;
Trace("Begin load document.");
document = HtmlServices.LoadDocument(virtualPath);
if (document == null)
{
throw new HttpException(404, "加载文档失败");
}
Trace("End load document.");
return(document);
}