JSON value could not be converted to Telegram.Bot.Types.Enums.ChatType

[lvyyln]

I found a bug to report
When i am trying to deserealize data from body json can't convert ChatType

Steps to reproduce:
1.Sending command 'start'
2.Waiting while json will be deserealized
3.Then happend 'bad request'

NuGet Package Version: 15.2.0

.NET Version: Core 3.1

IDE: Rider

App: Desktop

[tuscen]

Are you using System.Text.Json? The error message looks like from it.

[lvyyln]

No, i am not using System.Text.Json

[tuscen]

Could you add more context? Is it a webhook on ASP.NET Core 3.1 or long polling mode? If it is webhook could you provide the code from startup and where you're deserializing webhook request?

[lvyyln]

So this is a webhook on ASP.NET Core 3.1

Startup :

public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers();
        Bot.GetBotClientAsync().Wait();
    }

   
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseHttpsRedirection();

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
    }
}

GetBotClientAsync :

    private static TelegramBotClient botClient;
    private static List<Command> commandsList;

    public static IReadOnlyList<Command> Commands => commandsList.AsReadOnly();

    public static async Task<TelegramBotClient> GetBotClientAsync()
    {
        if (botClient != null)
        {
            return botClient;
        }

        commandsList = new List<Command>();
        commandsList.Add(new StartCommand());

        botClient = new TelegramBotClient(AppSettings.Key);
        
        string hook = string.Format(AppSettings.Url,"api/message/update"); 
        await botClient.SetWebhookAsync(hook);

        return botClient;
    }

And for deserializing i'm using frombody attribute
My controller:

    public async Task<OkResult> Post([FromBody]Update update)
    {
        var commands = Bot.Commands;
        var message = update.Message;
        var botClient = await Bot.GetBotClientAsync();

        foreach (var command in commands)
        {
            if (command.Contains(message))
            {
                await command.Execute(message, botClient);
                break;
            }
        }
        return Ok();
        
    }

[tuscen]

Ok, so you do use System.Text.Json, you just didn't know it. ASP.NET Core 3.0+ replaced Newtonsoft.Json as the default json formatter with STJ. But the client still doesn't support it yet. What you need to do is to install this nuget package and add it as the default json formatter. This should solve the problem.

services.AddControllers().AddNewtonsoftJson();

[lvyyln]

Thanks for help, everything is working, and maybe you write somewhere that for ASP.NET Core 3.0+ developers should use

services.AddControllers().AddNewtonsoftJson();

[sergiycheck]

Thank you I had the same problem and it worked!