asp.net - Is there a way to get ALL the MIME types instead of wrinting a huge case statement?

Question

I want to populate

Response.ContentType = "text/plain";

From somewhere in the server/web/dictionary ALL possible MIME types according to file extension:

public string GetMimeType(string extension)
{
    //This is what I am looking for.    
}

Also, I have to rename the file (at least if going to be downloaded, so I have to know in advance if it's going to be opened or not.

Answer 1

Umm... why? You're not going to be returning content of every possible type, are you?

Here's a list of common types: http://www.webmaster-toolkit.com/mime-types.shtml. There is no list that would include "ALL" types simply because any application vendor can create a custom one and associate it with a custom extension.