How to replace url-parameter?

Question

given is an URL like http://localhost:1973/Services.aspx?idProject=10&idService=14.

What is the most straightforward way to replace both url-paramet

Answer 1

I found this in an old code example, wouldnt take much to improve it, taking a IEnumerable> may be better than the current delimeted string.

    public static string AppendQuerystring( string keyvalue)
    {
        return AppendQuerystring(System.Web.HttpContext.Current.Request.RawUrl, keyvalue);
    }
    public static string AppendQuerystring(string url, string keyvalue)
    {
        string dummyHost = "http://www.test.com:80/";
        if (!url.ToLower().StartsWith("http"))
        {
            url = String.Concat(dummyHost, url);
        }
        UriBuilder builder = new UriBuilder(url);
        string query = builder.Query;
        var qs = HttpUtility.ParseQueryString(query);
        string[] pts = keyvalue.Split('&');
        foreach (string p in pts)
        {
            string[] pts2 = p.Split('=');
            qs.Set(pts2[0], pts2[1]);
        }
        StringBuilder sb = new StringBuilder();

        foreach (string key in qs.Keys)
        {
            sb.Append(String.Format("{0}={1}&", key, qs[key]));
        }
        builder.Query = sb.ToString().TrimEnd('&');
        string ret = builder.ToString().Replace(dummyHost,String.Empty);
        return ret;
    }

Usage

   var url = AppendQueryString("http://localhost:1973/Services.aspx?idProject=10&idService=14","idProject=12&idService=17");