[IL2CPP] Exception: Error: called non-existent method System.Collections.Specialized.NameValueCollec

Unity Engine
,
1

Ok the problem is “simple”:
IL2CPP is missing System.Web.HttpUtility.ParseQueryString method (for what I understand is the full System.Web that is missing).
It’s possible to replace it?
Will Unity implement it in the future?

In mono (android) everything works… but with mono I cannot do a 64-bit build.
Since IL2CPP is the future (and the only supported scripting backend for iOS) I really wish there is a way to workaround this problem.

Not sure if Unity will add the support for it or I should write it on my own but I really want to solve this problem.

Right now the problem is with this plugin (not made for Unity):

line 1080.
I already tried this:

and I already tried this solution:

private Dictionary<string, string> ParseQueryString(string url) {
    var querystring = url.Substring(url.IndexOf('?') + 1);
    var pairs = querystring.Split('&');
    var dict = pairs.Select(pair => { var valuePair = pair.Split('=');
    return new KeyValuePair<string, string>(valuePair[0], valuePair[1]); }) .ToDictionary((kvp) => kvp.Key, (kvp) => kvp.Value); return dict;
}

Both are not working.
I also tried to modify the RestSharp code by copying the original source code of those classes:

But I was only able to get a BadApi response.

I already had to recompile JSON .NET For Unity | Input Management | Unity Asset Store
since MegaApiClient require version 10 (and json net for unity is version 8.3 but 100% compatible).

Any ideas? Thank you.

PS. After a bit of debugging I even tried

 UriBuilder builder = new UriBuilder(BaseApiUri);
      var arguments = "";
      foreach (var item in query)
      {
        arguments = arguments + item.Key + "=" + item.Value + "&";
      }
      arguments = arguments.Substring(0, arguments.Length -1);

      builder.Query = arguments.ToString();
      return builder.Uri;

This stupid solution still works on the Editor but it still give an ApiException: BadSessionId on mobile (a MegaApiClient Exception).
/// API_ESID (-15): Invalid or expired user session, please relogin

Not sure why at this point.

2

The stupid solution works but IL2CPP also do same stripping that the old Mono does not (in Mono I can disable stripping, while in IL2CPP the minimum is Low).
To solve this little (but very annoying problem) you need to create a link.xml file:

<linker>
   <assembly fullname="MegaApiClient"> // the name of the assembly
      <type fullname="CG.Web.MegaApiClient.*" preserve="all"/> // excludes all namespaces and classes recursively under MyNamespace
   </assembly>
</linker>

With this everything works again.