Question

I can add any additional parameters to every ASP.NET MVC Method and MVC just ignore this parameters. The problem is that Google mark such pages as duplicate content. For example:

public ActionResult Index()

if I add link this this page like http://example.com/?abc=123 it is a duplicate content for Google. Is there any way to avoid this with ASP.NET MVC and allow only existing parameters?

Answer 1

Well you could use the Request object to cycle through the query string and throw an error if there is something there that you don’t want like so:

foreach (string a in Request.QueryString.AllKeys)
{
    // throw error if there is a key here we don't want
}

However, that this happens is really just a fact of the web and I don’t think you should worry about it. If you are concerned about it then just don’t create links to pages on your site with invalid parameters.