CloudMusic/FNZCM/FNZCM.Shared/Helpers/WebHelper.cs

using System.Web;

namespace FNZCM.Shared.Helpers
{
    public static class WebHelper
    {
        public static string UrlEscape(this string input)
        {
            if (input == null) return null;

            var uri = new Uri(input, UriKind.RelativeOrAbsolute);
            if (!uri.IsAbsoluteUri)
            {
                return input
                        .Replace("[", "%5B")
                        .Replace("]", "%5D")
                        .Replace("'", "%27")
                        .Replace(" ", "%20")
                        .Replace("#", "%23")
                    ;
            }

            var local = string.Join("/", uri.LocalPath.Split("/").Select(HttpUtility.UrlEncode));
            var str = $"{uri.Scheme}://{uri.Authority}{local}";

            return str.Replace("+", "%20");
        }
    }
}