Question

I’ve had several cases where I had a page with several query parameters – most recently a search results page – and needed to create a link to the same page with one or more query parameters changed in the URL. This seems like such a common use case that I feel as though there must be some simple built-in way of doing it.

Right now, I’m using a function I wrote which takes in a dictionary of parameters and values and merges them with the params and values from Request.QueryString. Parameters given with a null value are removed. It works, but I’m open to simpler methods.

Answer 1

Minor improvements I’d suggest:

//...
{
    UriBuilder ub = new UriBuilder(Request.Url);

    //...

    ub.Query = string.Join("&", parameters.Select(kv => string.Format("{0}={1}", Server.UrlEncode(kv.Key), Server.UrlEncode(kv.Value))));

    return ub.ToString();
}

---

Edit

Actually the return value should also be a Uri type but I didn’t want to introduce any breaking changes.