How to build a query string for a URL in C#?

Question

A common task when calling web resources from a code is building a query string to including all the necessary parameters. While by all means no rocket science, there are so

Answer 1

I needed to solve the same problem for a portable class library (PCL) that I'm working on. In this case, I don't have access to System.Web so I can't use ParseQueryString.

Instead I used System.Net.Http.FormUrlEncodedContent like so:

var url = new UriBuilder("http://example.com");

url.Query = new FormUrlEncodedContent(new Dictionary()
{
    {"param1", "val1"},
    {"param2", "val2"},
    {"param3", "val3"},
}).ReadAsStringAsync().Result;