Decoding Azure Search document keys in .net core without asp.net

Program.cs

public async Task Go()
{
    var response = await _client.GetStringAsync("https://<SEARCH_SERVICE>.search.windows.net/indexes/<INDEX>/docs?api-version=2017-11-11&search=*&%24top=100&%24select=metadata_storage_path");
    dynamic data = JsonConvert.DeserializeObject(response);
    foreach (dynamic a in data["value"])
    {
        string originalPath = a.metadata_storage_path.ToString();
        // remove extra char
        string path = originalPath.Substring(0, originalPath.Length - 1);
        // fix padding - remove extra characters that the .netfx UrlTokenEncode adds
        // see https://docs.microsoft.com/en-us/azure/search/search-indexer-field-mappings#base64decode
        var mod = path.Length % 4;
        var mod2 = mod % 2;
        path = path.PadRight(path.Length + (mod > 2 ? m2 : mod), '=');
        Console.WriteLine($"{path}: {System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(path))}");
    }
}