使用 ASP.NET 路由来提供静态文件

可以使用 ASP.Net 路由(不是 MVC)来提供静态文件吗?

Can ASP.Net routing (not MVC) be used to serve static files?

说我想路由

http://domain.tld/static/picture.jpg

到

http://domain.tld/a/b/c/picture.jpg

而且我想动态地进行，因为重写的 URL 是即时计算的.我无法一劳永逸地设置静态路由.

and I want to do it dynamically in the sense that the rewritten URL is computed on the fly. I cannot set up a static route once and for all.

无论如何，我可以创建这样的路线:

Anyway, I can create a route like this:

routes.Add(
  "StaticRoute", new Route("static/{file}", new FileRouteHandler())
);

在 FileRouteHandler.ProcessRequest 方法中，我可以将路径从 /static/picture.jpg 重写为 /a/b/c/picture.jpg代码>.然后我想为静态文件创建一个处理程序.ASP.NET 为此使用 StaticFileHandler.不幸的是，这个类是内部的.我尝试使用反射创建处理程序，它确实有效:

In the FileRouteHandler.ProcessRequest method I can rewrite the path from /static/picture.jpg to /a/b/c/picture.jpg. I then want to create a handler for static files. ASP.NET uses the StaticFileHandler for this purpose. Unfortunately, this class is internal. I have tried to create the handler using reflection and it actually works:

Assembly assembly = Assembly.GetAssembly(typeof(IHttpHandler));
Type staticFileHandlerType = assembly.GetType("System.Web.StaticFileHandler");
ConstructorInfo constructorInfo = staticFileHandlerType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null);
return (IHttpHandler) constructorInfo.Invoke(null);

但是使用内部类型似乎不是正确的解决方案.另一种选择是实现我自己的 StaticFileHandler，但正确执行此操作(支持范围和 etag 等 HTTP 内容)并非易事.

But using internal types doesn't seem to be the proper solution. Another option is to implement my own StaticFileHandler, but doing so properly (supporting HTTP stuff like ranges and etags) is non-trivial.

我应该如何处理 ASP.NET 中静态文件的路由?

How should I approach routing of static files in ASP.NET?