/// <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>
/// 获取视图处理程序
/// </summary>
/// <returns>视图处理程序</returns>
protected virtual IViewHandler GetHandler(string virtualPath)
{
var cacheKey = handlerPathCachePrefix + virtualPath;
var cacheItem = HttpRuntime.Cache.Get(cacheKey);
if (cacheItem == null)
{
var handlerPath = ViewHandlerProvider.GetHandlerPath(Scope);
cacheItem = new HandlerPathCacheItem()
{
HandlerPath = handlerPath
};
HttpRuntime.Cache.Insert(cacheKey, cacheItem, ScopeCacheDependency);
}
return(ViewHandlerProvider.GetViewHandler(virtualPath));
}
/// <summary>
/// 获取视图处理程序
/// </summary>
/// <returns>视图处理程序</returns>
protected virtual IViewHandler GetHandler( string virtualPath )
{
var cacheKey = handlerPathCachePrefix + virtualPath;
var cacheItem = HttpRuntime.Cache.Get( cacheKey );
if ( cacheItem == null )
{
var handlerPath = ViewHandlerProvider.GetHandlerPath( Scope );
cacheItem = new HandlerPathCacheItem() { HandlerPath = handlerPath };
HttpRuntime.Cache.Insert( cacheKey, cacheItem, ScopeCacheDependency );
}
return ViewHandlerProvider.GetViewHandler( virtualPath );
}
