Newtonsoft.Json.JsonSerializationException Message=No se puede deserializar el objeto JSON actual

Intento agregar un paciente a la base de datos de firebase.

este es el codigo

Paciente.cs

public class Patient
{
 public string ID { get; set; }
 public string PatientName { get; set; }
 public string PatientGender { get; set; }
 public string PatientAddress { get; set; }
 public string PatientWeight { get; set; }
 public string PatientHeight { get; set; }
 public string PatientMobileNO { get; set; }
 public string PatientBirthday { get; set; }
 public string PatientGenticesDiseses { get; set; }
 // public List<Appoitment> Appointments { get; set; }
 public ObservableCollection<Appoitment> Appointments;
 public Patient()
 {
 }
 public Patient(Patient instans)
 {
 ID = instans.ID;
 PatientName = instans.PatientName;
 PatientGender = instans.PatientGender;
 PatientAddress = instans.PatientAddress;
 PatientWeight = instans.PatientWeight;
 PatientHeight = instans.PatientHeight;
 PatientMobileNO = instans.PatientMobileNO;
 PatientGenticesDiseses = instans.PatientGenticesDiseses;
 Appointments = instans.Appointments;
 }
}

ServiciosPacientes.cs

public async Task Addpat( Patient patient)
{
 var x = await firebaseClient
.Child($"Specalists/406707265/Patients")
.PostAsync(new Patient(patient));
 Patient pat = new Patient(x.Object);
 pat.ID = x.Key;
 await firebaseClient
.Child($"Specalists/406707265/Patients/{pat.ID}")
.PatchAsync(pat);
}

agregarPaciente.xaml.cs

public partial class AddPatientPage: ContentPage
{
 public AddPatientPage()
 {
 InitializeComponent();
 AddPatientClick();
 }
 public async void addPatient()
 {
 PatientService patientService = new PatientService();
 Patient pat = new Patient();
 pat.PatientAddress = PatientAddress.Text;
 pat.PatientBirthday = PatientBirthday.Text;
 pat.PatientGender = PatientGender.Text;
 pat.PatientGenticesDiseses = PatientGenticsDiseses.Text;
 pat.PatientHeight = PatientHeight.Text;
 pat.PatientMobileNO = PatientMobileNo.Text;
 pat.PatientName = PatientName.Text;
 pat.PatientWeight = PatientWeight.Text;
 Random rd = new Random();
 int rand_num = rd.Next(1, 4000);
 pat.ID = rand_num.ToString();
 try
 {
 await patientService.Addpat(pat);
 await Application.Current.MainPage.DisplayAlert("message", "Patient Added", "ok");
 await Navigation.PushAsync(new PatientsListPage());
 }
 catch (Exception ex)
 {
 await Application.Current.MainPage.DisplayAlert("error", ex.Message, "ok");
 }
 }
 void AddPatientClick()
 {
 save.GestureRecognizers.Add(new TapGestureRecognizer()
 {
 Command = new Command(() =>
 {
  addPatient();
 })
 });
 }
}

agregarPaciente.xaml

<Entry Placeholder="Patient Address"
 x:Name="PatientAddress"></Entry>
<Entry Placeholder="Patient Birthday"
 x:Name="PatientBirthday"></Entry>
<Entry Placeholder="Patient Gender"
 x:Name="PatientGender"></Entry>
<Entry Placeholder="Patient Gentics Diseses"
 x:Name="PatientGenticsDiseses"></Entry>
<Entry Placeholder="Patient Height"
 x:Name="PatientHeight"></Entry>
<Entry Placeholder="Patient Mobile Number"
 x:Name="PatientMobileNo"></Entry>
<Entry Placeholder="Patient Name"
 x:Name="PatientName"></Entry>
<Entry Placeholder="Patient Weight"
 x:Name="PatientWeight"></Entry>
<Label x:Name="save" HorizontalOptions="Center" >Save</Label>

El código funciona y Patientse agrega a Firebase, pero cuando me da la alerta, ¿la aplicación falla y se detiene?

Intento solucionarlo, pero no conozco el problema, ¿qué debo hacer?

aquí el ex

Newtonsoft.Json.JsonSerializationException
 Message=Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[CCSN.Models.Patient]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal.NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path '0', line 1, position 5.

en esta fila para tener paciencia

return JsonConvert.DeserializeObject<TEntity>(json);

 public static async Task<TEntity> Get<TEntity>(string url)
 {
 HttpClientHandler clientHandler = new HttpClientHandler();
 clientHandler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return true; };
 HttpClient client = new HttpClient(clientHandler);
 var response = await client.GetAsync(url);
 var json = await response.Content.ReadAsStringAsync();
 
 return JsonConvert.DeserializeObject<TEntity>(json);
 }

es el error de no convertir?

y ¿cómo puedo convertir a objeto o json?

JSON
{"0":{"Citas":[{"AppointmentDate":"2022-04-12T00:00:00+03:00","AppointmentPatientName":"Ghaidaa","AppointmentTime":"00:00:00 ","FollowUpAddNote":"prueba","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"0","PatientID":"0"},{"AppointmentDate":"2022-04-11T18:58:03.623061+03:00","AppointmentPatientName":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22- 2-2022","FollowUpGoals":"R alfa","FollowUpTools":"Ninguno","ID":"1","PatientID":"0"},{"Fecha de cita":"2022-04-11T18:58:03.623061+03:00","Nombre de paciente de cita":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alfa","FollowUpTools":"Ninguno","ID":"2","PatientID":"0"},{"AppointmentDate":"2022-04-11T18:58:03.623061+03:00 ","AppointmentPatientName":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"3","IDPaciente":"0"},{"FechaCita":"2022-04-12T00:00:00+03:00","NombrePacienteCita":"Ghaidaa","AppointmentTime":"00:00:00","FollowUpAddNote":"prueba","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno ","ID":"4","IDPaciente":"0"}],"ID":"0","DirecciónPaciente":"Nablus-Tell","CumpleañosPaciente":"8-3-2001", "PatientGender":"Female","PatientGenticsDiseses":"Ninguno","PatientHeight":168,"PatientMobileNo":"0568982001","PatientName":"Ghaidaa","PatientWeight":60},"1":{ "Citas":[{"FechaCita":"2022-04-12T18:58:03.623061+03:00","NombrePacienteCita":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"0","PatientID": "1"},{"AppointmentDate":"2022-04-11T18:58:03.623061+03:00","ApointmentPatientName":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2 -2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"1","PatientID":"0"},{"AppointmentDate":"2022-04-11T18: 58:03.623061+03:00","CitaPacienteNombre":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"2","PatientID":"0"},{"AppointmentDate":"2022-04-11T18:58:03.623061+03:00","AppointmentPatientName":"Ghaidaa","FollowUpAddNote":"Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno"," ID":"3","PatientID":"0"},{"AppointmentDate":"2022-04-12T18:58:03.623061+03:00","AppointmentPatientName":"Ghaidaa","FollowUpAddNote":" Ninguno","FollowUpDate":"22-2-2022","FollowUpGoals":"R alpha","FollowUpTools":"Ninguno","ID":"4","IDPaciente":"0"}],"ID":"1","DirecciónPaciente":"Nablus-Tell","CumpleañosPaciente":"3-8-2001","GéneroPaciente":"Mujer","PatientGenticsDiseses":"Ninguno","PatientHeight":168,"PatientMobileNo":"0568982001","PatientName":"shada","PatientWeight":60},"-N-tZ6hbyPpWOWeoo9o4":{"ID": "45455184","PatientAddress":"g","PatientGender":"h","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs","PatientName":"sgagaga ","PesoPaciente":"67"}}1","Dirección del paciente":"Nablus-Tell","Cumpleaños del paciente":"3-8-2001","Género del paciente":"Mujer","Enfermedades genéticas del paciente":"Ninguna","Altura del paciente":168,"Móvil del pacienteNo":"0568982001","PatientName":"shada","PatientWeight":60},"-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h ","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs","PatientName":"sgagaga","PatientWeight":"67"}}1","Dirección del paciente":"Nablus-Tell","Cumpleaños del paciente":"3-8-2001","Género del paciente":"Mujer","Enfermedades genéticas del paciente":"Ninguna","Altura del paciente":168,"Móvil del pacienteNo":"0568982001","PatientName":"shada","PatientWeight":60},"-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h ","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs","PatientName":"sgagaga","PatientWeight":"67"}}SexoPaciente":"Female","PatientGenticsDiseses":"Ninguno","PatientHeight":168,"PatientMobileNo":"0568982001","PatientName":"shada","PatientWeight":60},"-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs", "PatientName":"sgagaga","PatientWeight":"67"}}SexoPaciente":"Female","PatientGenticsDiseses":"Ninguno","PatientHeight":168,"PatientMobileNo":"0568982001","PatientName":"shada","PatientWeight":60},"-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs", "PatientName":"sgagaga","PatientWeight":"67"}}-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs","PatientName":"sgagaga","PatientWeight":"67"}}-N-tZ6hbyPpWOWeoo9o4":{"ID":"45455184","PatientAddress":"g","PatientGender":"h","PatientGenticesDiseses":"b","PatientHeight":"26","PatientMobileNO":"hshhs","PatientName":"sgagaga","PatientWeight":"67"}}

Solución del problema

El ir y venir en los comentarios se ha vuelto difícil de manejar. Aquí hay una wiki de la comunidad que muestra el estado de resolución de esto.

Excepción:

Newtonsoft.Json.JsonSerializationException
 Message=Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[CCSN.Models.Patient]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal.NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path '0', line 1, position 5.

NOTA: La excepción dice que está tratando de deserializar en

'System.Collections.Generic.List`1[CCSN.Models.Patient]'

En C# eso sería un List<Patient>.

Declaración en PatientServices.Addpat en la que se cree que ocurre la excepción:

 var x = await firebaseClient
.Child($"Specalists/406707265/Patients")
.PostAsync(new Patient(patient));

Esas declaraciones deben conducir a esto: la línea de nivel inferior en la que se produce la excepción:

 return JsonConvert.DeserializeObject<TEntity>(json);

@nombre:

¿Es esa una línea en su fuente? Si es así, ponle un punto de interrupción. En el panel VS Locals, busque json. En su valor, la pequeña flecha hacia abajo le permite seleccionar cómo verlo. Use TextVisualizer (o si hay una opción Json, úsela). Copie el valor de Visualizer y péguelo aquí:

pegue el valor json aquí

Mientras está en el punto de interrupción, si pasa el mouse sobre TEntityesa línea, ¿VS muestra un tipo?

Tipo de entidad aquí

En el punto de interrupción, muestra las primeras líneas de la pila. Todas las líneas hasta llegar a una línea Addpatdentro de ella.

pegar pila aquí