Determining doctype of current page or master page programmatically

I need to be able to programmatically determine the doctype of the current page (.aspx), whether its set directly within the page itself开发者_运维百科, or via a master page.

The reason is so I can output correctly formatted html from custom controls or components based on whether the doctype is plain html, xhtml, xml or whatever.

Use a literal tag for your doctype declarations and control it in code behind.

I can't think of a way to reliably do what you want to do. You could obviously manually parse the master page but that wouldn't handle the dynamic case. I would recommend adding an attribute to your control that specifies the rendering mode and force your consumers to set it (default to XHTML probably since that's the VS default).