Getting a MIME type from a file extension in ASP.NET 4.5

If you've ever implemented a file upload or download scenario in ASP.NET, you've likely come across the situation of having to provide a MIME type based off of a file extension. IIS does this automatically when it serves files, but it seems like in ASP.NET there isn't a good way to provide this functionality. Searches on the web might point you to building your own Dictionary of MIME types or just writing a switch statement, but this felt like a hack to me and so I turned to a resident expert, Levi Broderick. It turns out in ASP.NET 4.5 we shipped a little-known new type, System.Web.MimeMapping, which has an API called GetMimeMapping(string fileName). Here is the MSDN documentation . You can pass either a file name as the method...(read more) ...