Just a simple LINQ query to split an URL's query into a key/value dictionary. Useful in PCL's where there is not HttpUtility class.

urlstuff.cs

static Dictionary<string, string> QueryToKeyValueDictionary(string url)
{
    return
        url.Substring(url.IndexOf('?') + 1)
            .Split('&')
            .Select(pair => pair.Split('='))
            .ToDictionary(val => val[0], val => Uri.UnescapeDataString(val[1]));
}