In the cshtml page, expressions that begin with ' @ ' represent C # statements that are compiled and executed

In the original index.html is normal display, but now this source code is a cshtml page:

However, in the cshtml page, the expression starting with ' @ ' represents the C # statement, which is compiled and executed, and the controller is searched for the value of the @media parameter.

Therefore, the context value of media cannot be found on the cshtml page.

The solution is to add a ' @ ' before ' @media ', indicating that the @ has no special meaning.

In the cshtml page, expressions that begin with ' @ ' represent C # statements that are compiled and executed