C#:PCL版の URI Query の Dictionary化

    using System;
    using System.Linq;
    using System.Collections.Generic;
    using NUnit.Framework;

    using MonoTouch.UIKit;

    [TestFixture]
    public class UnitMisc : UnitBase
    {

        public Dictionary<string, string> ParseQuery(string query)
        {
            return query
                    .Split ("?&".ToCharArray ())
                    .Where (i => string.IsNullOrEmpty (i) == false)
                    .Select (i => i.Split ('='))
                    .ToDictionary (
                        i => Uri.UnescapeDataString (i [0]), 
                        i => Uri.UnescapeDataString (i [1]));
        }



        [Test]
        public void TestUri()
        {

            var authreq = _ (@"
            openid://?
            response_type=id_token
            &client_id=https%3A%2F%2Fclient.example.org%2Fcb
            &scope=openid%20profile
            &state=af0ifjsldkj
            &nonce=n-0S6_WzA2Mj
            &registration=%7B%22logo_uri%22%3A%22https%3A%2F%2F
            client.example.org%2Flogo.png%22%7D
            ");

            var uri = new Uri (authreq);

            var query = ParseQuery (uri.Query);

            Assert.AreEqual (query.Count, 6);
            Assert.AreEqual (query ["response_type"], "id_token");
            Assert.AreEqual (query ["client_id"], "https://client.example.org/cb");
            Assert.AreEqual (query ["state"], "af0ifjsldkj");
            Assert.AreEqual (query ["scope"], "openid profile");
            Assert.AreEqual (query ["nonce"], "n-0S6_WzA2Mj");
            Assert.AreEqual (query ["registration"],
                @"{""logo_uri"":""https://client.example.org/logo.png""}");

        }
    }