URL Encoding / HttpClient

HttpHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace UnitTest.Client
{
    public static class HttpHelper
    {
        public static string AddQuery(this string uri, IDictionary<string, string> data) =>
            $"{uri}?{data.ToFormUrlEncoded()}";

        public static string ToFormUrlEncoded(this IDictionary<string, string> data)
        {
            using (var content = new FormUrlEncodedContent(data))
                return content.ReadAsStringAsync().GetAwaiter().GetResult();
        }

        async public static Task<T> GetAsync<T>(string uri)
        {
            using (var http = new HttpClient())
            {
                var response = await http.GetAsync(uri);
                response.EnsureSuccessStatusCode();
                return await response.Content.ReadAsAsync<T>();
            }
        }

        async public static Task<T> PostAsFormAsync<T>(string uri, IDictionary<string, string> data)
        {
            using (var http = new HttpClient())
            {
                var response = await http.PostAsync(uri, new FormUrlEncodedContent(data));
                response.EnsureSuccessStatusCode();
                return await response.Content.ReadAsAsync<T>();
            }
        }
    }
}

UriQueryTest.cs

using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace UnitTest.Client
{
    [TestClass]
    public class UriQueryTest
    {
        [TestMethod]
        public void Get_Segment()
        {
            // http://localhost:1961/api/uriquery/Hello~%2C%20World%21
            var uri = $"http://localhost:1961/api/uriquery/{Uri.EscapeDataString("Hello~, World!")}";
            var result = HttpHelper.GetAsync<string>(uri).GetAwaiter().GetResult();
        }

        [TestMethod]
        public void Get_Query()
        {
            var data = new Dictionary<string, string>
            {
                { "id", "Hello, the \"World+\"." },
            };

            // http://localhost:1961/api/uriquery?id=Hello%2C+the+%22World%2B%22.
            var uri = "http://localhost:1961/api/uriquery".AddQuery(data);
            var result = HttpHelper.GetAsync<string>(uri).GetAwaiter().GetResult();
        }

        [TestMethod]
        public void Post_Form()
        {
            var data = new Dictionary<string, string>
            {
                { "name", "Hello, the \"World+\"." },
            };

            var uri = "http://localhost:1961/api/uriquery";
            var result = HttpHelper.PostAsFormAsync<string>(uri, data).GetAwaiter().GetResult();
        }
    }
}