/// <summary>
/// 加载 HTML 文档
/// </summary>
/// <param name="virtualPath">文档的虚拟路径</param>
/// <param name="cacheDependency">若文档已被缓存，获取缓存依赖项</param>
/// <returns>HTML 文档对象</returns>
public static IHtmlDocument LoadDocument(string virtualPath, out CacheDependency cacheDependency)
{
string cacheKey;
var result = LoadDocument(virtualPath, out cacheKey);
if (result == null)
{
cacheDependency = null;
return(result);
}
if (cacheKey != null)
{
cacheDependency = new CacheDependency(new string[0], new string[] { cacheKey });
}
else
{
cacheDependency = HtmlServices.CreateCacheDependency(virtualPath);
}
return(result);
}
/// <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>
/// 利用指定 VirtualPathProvider 将虚拟路径所指向文件当作静态文件加载。
/// </summary>
/// <param name="provider">指定的 VirtualPathProvider</param>
/// <param name="virtualPath">虚拟路径</param>
/// <returns>加载结果</returns>
public HtmlContentResult LoadContent(VirtualPathProvider provider, string virtualPath)
{
if (!VirtualPathUtility.IsAppRelative(virtualPath))
{
return(null);
}
if (!provider.FileExists(virtualPath))
{
return(null);
}
var file = provider.GetFile(virtualPath);
if (file == null)
{
return(null);
}
var key = provider.GetCacheKey(virtualPath) ?? "StaticFile_" + virtualPath;
var content = HttpRuntime.Cache.Get(key) as string;
if (content == null)
{
var dependency = HtmlServices.CreateCacheDependency(provider, virtualPath);
content = LoadContent(file);
HttpRuntime.Cache.Insert(key, content, dependency);
}
return(new HtmlContentResult(content, key));
}