Passing an array of values in Url.Action

I need to pass an array of values in Url.Action.

Currently I'm doing:

var redirectUrl = Url.Action("search", new {   
        q = criteria.Q,
        advanced = criteria.Advanced,
        salaryfrom = criteria.SalaryFrom,
        salaryto = criteria.SalaryTo,
    });

if (criteria.JobTypes != null)
    redirectUrl += criteria.JobTypes.Aggregate(string.Empty, (a, x) => a += "&jobTypes=" + x);

To give me something like:

/search?q=developer&advanced=false&salaryfrom=20000&salaryto=80000&jobTypes=Full%20Time&jobTypes=Contract

Is there a nicer/cleaner approach?

I assume you "own" the controller?
If so, I'd serialize and deserialize the list as a comma separated string on each side.
It'd also be nice if criteria.JobTypes is an empty list instead of a possible null, then you don't need the ?? below.

var redirectUrl = Url.Action("search", new {
    // ...
    jobTypes = String.Join(criteria.JobTypes ?? new string[0], ",")
}

And do jobTypes.split(",") in the action.

URL would look a bit nicer too:

/search?q=developer&advanced=false&salaryfrom=20000&salaryto=80000&jobTypes=Full%20Time,Contract

StackExchange Code Review Q#11716, answer score: 5