[v2.0.0-develop-1][Xamarin] User SignUp

[P0wmes]

i was using parse sdk v2.0 in a Xamarin Forms Shared Project.
I am trying to register a new user using Source: https://github.com/parse-community/Parse-SDK-dotNET/#basic-demonstration

Steps to reproduce

Create a Xamarin Forms Shared Project. Install-Package parse -Version 2.0.0-develop-1
Copy Paste Code:

// Instantiate a ParseClient.
ParseClient client = new ParseClient(back4app_app_id,back4app_server_url, clientKey);

  var instal = client.Services.GetCurrentInstallation();
  // Create a user, save it, and authenticate with it.
  await client.SignUpAsync(username: "TestABC", password: "Test");

  // Get the authenticated user. This is can also be done with a variable that stores the ParseUser instance before the SignUp overload that accepts a ParseUser is called.
  var curUser=client.GetCurrentUser();

  // Deauthenticate the user.
  await client.LogOutAsync();

  // Authenticate the user.
  ParseUser user = client.LogInAsync(username: "Test", password: "Test").Result;

Actual Outcome

await client.SignUpAsync(username: "TestABC", password: "Test");
throws following exception:
System.ArgumentNullException: 'Value cannot be null.Parameter name: element'

Expected Outcome

After SignUpAsync() Function client.GetCurrentUser() should return current User

Environment

Server

• Parse Server version: 4.2.0
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Back4APP

Client

• Parse .NET SDK version: -Version 2.0.0-develop-1
• Xamarin.Forms Project is .NET 2.1

[thibautvdu]

I'm facing the exact same error with the function CallCloudCodeFunctionAsync
Xamarin Forms shared project too.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sschaub]

I recently encountered this same issue. The problem and the solution is referenced in other issues here, such as #344. Namely, you have to follow the procedure in the README for the Unity client: https://github.com/parse-community/Parse-SDK-dotNET#use-in-unity-client

You have to adapt it a bit for Xamarin. Here is what I've used to get it working with Xamarin Forms 5:

var client = new ParseClient(new ServerConnectionData
            {
                ApplicationID = "...",
                Key = "...",
                ServerURI = "..."
            },
            new LateInitializedMutableServiceHub(),
            new MetadataMutator
            {
                EnvironmentData = new EnvironmentData { OSVersion = Environment.OSVersion.ToString(), Platform = Device.RuntimePlatform, TimeZone = TimeZoneInfo.Local.StandardName },
                HostManifestData = new HostManifestData {
                    Version = this.GetType().Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>().InformationalVersion,
                    Name = this.GetType().Assembly.GetName().Name,
                    ShortVersion = this.GetType().Assembly.GetName().Version.ToString(),
                    Identifier = AppDomain.CurrentDomain.FriendlyName
                }
            });

[hhgz9527]

ServerURI need add / to last, such as http://localhost:1337/api/