I try to add patient to firebase database.
This is the code
Patient.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;
}
}
PatientServices.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);
}
addPatient.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();
})
});
}
}
addPatient.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>
The code works, and the Patient is added to Firebase, but when it gives me the alert the application crash and stopped?
I try to fix it, but I do not know the problem, what should I do?
here the 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.
in this line to get patient
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);
}
is the error from not converting?
and how can i convert to object or json
JSON (pretty-printed)
{
"0": {
"Appointments": [
{
"AppointmentDate": "2022-04-12T00:00:00 03:00",
"AppointmentPatientName": "Ghaidaa",
"AppointmentTime": "00:00:00",
"FollowUpAddNote": "test",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "0",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "1",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "2",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "3",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-12T00:00:00 03:00",
"AppointmentPatientName": "Ghaidaa",
"AppointmentTime": "00:00:00",
"FollowUpAddNote": "test",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "4",
"PatientID": "0"
}
],
"ID": "0",
"PatientAddress": "Nablus-Tell",
"PatientBirthday": "8-3-2001",
"PatientGender": "Female",
"PatientGenticsDiseses": "None",
"PatientHeight": 168,
"PatientMobileNo": "0568982001",
"PatientName": "Ghaidaa",
"PatientWeight": 60
},
"1": {
"Appointments": [
{
"AppointmentDate": "2022-04-12T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "0",
"PatientID": "1"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "1",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "2",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-11T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "3",
"PatientID": "0"
},
{
"AppointmentDate": "2022-04-12T18:58:03.623061 03:00",
"AppointmentPatientName": "Ghaidaa",
"FollowUpAddNote": "None",
"FollowUpDate": "22-2-2022",
"FollowUpGoals": "R alpha",
"FollowUpTools": "None",
"ID": "4",
"PatientID": "0"
}
],
"ID": "1",
"PatientAddress": "Nablus-Tell",
"PatientBirthday": "8-3-2001",
"PatientGender": "Female",
"PatientGenticsDiseses": "None",
"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"
}
}
this is the service to get Patient
public static async Task<IEnumerable<Patient>> GetUserPatients()
{
var url = await firebaseClient
.Child($"Specalists/406707265/Patients").BuildUrlAsync();
var patientsDict = await Helper.Get<Dictionary<string, Patient>>(url);
var result = patientsDict.Values.ToList();
return result ;
}
CodePudding user response：
The back and forth in comments has gotten unwieldy. Here is a community wiki showing the status of resolving this.
Exception:
Newtonsoft.Json.JsonSerializationException
Message=Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[CCSN.Models.Patient]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path '0', line 1, position 5.
NOTE: Exception says is trying to deserialize into
'System.Collections.Generic.List`1[CCSN.Models.Patient]'
In c# that would be a List<Patient>.
Statement in PatientServices.Addpat in which exception is believed to occur:
var x = await firebaseClient
.Child($"Specalists/406707265/Patients")
.PostAsync(new Patient(patient));
Those statements must lead to this - the lower-level line in which exception occurs:
return JsonConvert.DeserializeObject<TEntity>(json);
- json (skipping most of it):
{
"0":{
"Appointments":[
{"AppointmentDate":"2022-04-12T00:00:00 03:00"
}
],
"ID": "0",
"PatientName": "Ghaidaa"
},
"-N-tZ6hbyPpWOWeoo9o4": {
"ID": "45455184",
"PatientName": "sgagaga"
}
}
- TEntity:
Based on the error message, TEntity is presumably List<Patient>.
The problem is that the json (shown above) isn't in the expected format. It is a dynamic object with keys "0", "1", "-N-tZ6hbyPpWOWeoo9o4".
The calling code is expecting a json array, which would look like this:
[ {
"Appointments":[
{"AppointmentDate":"2022-04-12T00:00:00 03:00"
}
],
"ID": "0",
"PatientName": "Ghaidaa"
},
{
"ID": "45455184",
"PatientName": "sgagaga"
}
]
The difference is easiest to see by examining the beginning and end of the json.
One way to fix is to deserialize to a Dictionary. Then extract the values of the Dictionary into a list.
Find code that looks something like the line below. Replace:
var patients = await Helper.Get<List<Patient>>(url);
With:
var patientsDict = await Helper.Get<Dictionary<string, Patient>>(url);
var patients = patientsDict.Values;
Or depending on how you use it, might change the last line to:
var patients = patientsDict.Values.ToList();
An ALTERNATIVE way to fix is to change the server side, so that it sends an array of Patients instead of a dynamic object.
--- Making that change is beyond the scope of this answer ---