ASP.NET Routing - capture entire url with constraint

Question

I want to set up a route that will match on any url, with a constraint. This is what I have tried:

routes.MapRouteLowercase("CatchAll Content Validation", "{*url}",
    new { controller = "Content", action = "LoadContent" },
    new { url = new ContentURLConstraint(), }
);

and for testing purposes I have the following simple constraint:

public class ContentURLConstraint : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        var s = (string)values["url"];
        return s.Contains("comm");              
    }
}

If the constraint is satisfied I when expect to pass the full url to the controll action LoadContent

public ActionResult LoadContent(string url)
{
   return Content(url);
}

I am expecting, when I load a page, for s in the Match function to contain the entire url, so that I can check it, but instead it is null. What might I be missing?

Not fully clear what you are trying to achieve. Could you maybe update your question with some examples? — Andrii Litvinov
– Andrii Litvinov, Commented May 9, 2017 at 16:05
I've added some more detail. In short, I want to check all incoming urls against the constraint, and pass the full url along to the Action if satisfied. The Match function shown is just for illustrating the problem I am having. — jackmott
– jackmott, Commented May 9, 2017 at 16:21
Show us what the values object looks like within the method. — krillgar
– krillgar, Commented May 9, 2017 at 16:25

Andrii Litvinov · Accepted Answer · 2017-05-09 17:21:25Z

2

You get null when there is no url in the route, i.e. host itself: http://localhost:64222.

When there is a url, e.g.: http://localhost:64222/one/two, your url parameter will hold a value: one/two.

You can modify your constraint to something like:

public class ContentURLConstraint : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values routeDirection)
    {
        var url = values[parameterName] as string;
        if (!string.IsNullOrEmpty(url))
        {
            return url.Contains("comm");
        }

        return false; // or true, depending on what you need.
    }
}

What might I be missing?

Could be that you are missing that url constraint does not contain host, port, schema and query string. If you need it - you can get it from httpContext.Request.

edited May 9, 2017 at 17:21

answered May 9, 2017 at 16:55

Andrii Litvinov

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1 Comment

jackmott Over a year ago

That makes sense! Thank you.

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