Xamarin Firebase and Syncfusion DataGrid. How do I listen for Firebase changes? - firebase

Question

I'm having trouble with the coding to properly listen for Firebase add or update events. My attempt below has the data loading into the Syncfusion Datagrid, but there is a weird glitch where when I click the mouse on the Datagrid and pull-down, the first record in my 4 record set gets added to the bottom of the Datagrid, showing a 5th record... if I update an element in the Datagrid, the change is not reflected in Firebase. If I add or change a value in firebase, it does not update in Datagrid. Any help to steer me in the right direction to get this to work would be appreciated. Here's the code:
the VisualStudio 2019
CookPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Chart_sample"
xmlns:gauge="clr-namespace:Syncfusion.SfGauge.XForms;assembly=Syncfusion.SfGauge.XForms"
xmlns:Syncfusion="clr-namespace:Syncfusion.SfDataGrid.XForms;assembly=Syncfusion.SfDataGrid.XForms"
mc:Ignorable="d"
x:Class="Chart_sample.Views.CookPage">
<StackLayout>
<Syncfusion:SfDataGrid x:Name="sfGrid">
</Syncfusion:SfDataGrid>
</StackLayout>
</ContentPage>
CookPage.xaml.cs
using Chart_sample.Services;
using Syncfusion.SfDataGrid.XForms;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace Chart_sample.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class CookPage : ContentPage
{
FirebaseHelper firebaseHelper = new FirebaseHelper();
public CookPage()
{
InitializeComponent();
// for Syncfusion DataGrid
firebaseHelper.listenForEvents();
sfGrid.ItemsSource = ViewProgramModel._returnedEvents;
sfGrid.ColumnSizer = ColumnSizer.Star;
sfGrid.AllowEditing = true;
sfGrid.NavigationMode = NavigationMode.Cell;
sfGrid.SelectionMode = Syncfusion.SfDataGrid.XForms.SelectionMode.Single;
}
}
}
FirebaseHelper.cs
using Firebase.Database;
using Firebase.Database.Query;
using System;
using System.Linq;
namespace Chart_sample.Services
{
public class FirebaseHelper
{
internal ViewProgramModel ViewProgramModel { get; set; }
FirebaseClient firebase = new FirebaseClient("https://pelletpirate.firebaseio.com/");
private readonly string ChildProgram = "ControllerData/Pellet_Pirate_1/Program";
public static IDisposable returnedEvents;
public async void listenForEvents()
{
ViewProgramModel._returnedEvents.Clear();
var programs = await firebase.Child(ChildProgram).OnceAsync<ViewProgramModel>();
for (int i = 0; i < programs.Count; i++)
{
ViewProgramModel._returnedEvents.Add(programs.ElementAt(i).Object);
}
returnedEvents = firebase.Child(ChildProgram).OrderByKey().AsObservable<ViewProgramModel>()
.Subscribe(eventReceived =>
{
if (eventReceived.EventType == Firebase.Database.Streaming.FirebaseEventType.InsertOrUpdate)
{
var found = ViewProgramModel._returnedEvents.FirstOrDefault(i => i._KEY == eventReceived.Key);
if (found == null)
{
// not in observable collection, add it
ViewProgramModel._returnedEvents.Add(eventReceived.Object);
}
else
{
// event was updated
int tempIndex = ViewProgramModel._returnedEvents.IndexOf(found);
ViewProgramModel._returnedEvents[tempIndex] = eventReceived.Object;
}
}
});
}
}
}
ViewProgrammodel.cs
using System.Collections.ObjectModel;
using System.ComponentModel;
namespace Chart_sample
{
public class ViewProgramModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _KEy;
private string MOde;
private int TArget;
private string TRigger;
private int TRiggerVAlue;
public string _KEY
{
get { return _KEy; }
set
{
this._KEy = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("_KEY"));
}
}
public string MODE
{
get { return MOde; }
set
{
this.MOde = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("MODE"));
}
}
public int TARGET
{
get { return TArget; }
set
{
this.TArget = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TARGET"));
}
}
public string TRIGGER
{
get { return TRigger; }
set
{
this.TRigger = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TRIGGER"));
}
}
public int TRIGGERVALUE
{
get { return TRiggerVAlue; }
set
{
this.TRiggerVAlue = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TRIGGERVALUE"));
}
}
public static ObservableCollection<ViewProgramModel> _returnedEvents = new ObservableCollection<ViewProgramModel>();
}
}

Answer 1

I edit your demo, I achieve the update, Add, delete function.
Here is running GIF.
I change your ViewProgramModel like following code. Just move the _returnedEvents to the FirebaseHelper.cs
namespace Chart_sample
{
public class ViewProgramModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _KEy;
private string MOde;
private int TArget;
private string TRigger;
private int TRiggerVAlue;
public string _KEY
{
get { return _KEy; }
set
{
this._KEy = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("_KEY"));
}
}
public string MODE
{
get { return MOde; }
set
{
this.MOde = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("MODE"));
}
}
public int TARGET
{
get { return TArget; }
set
{
this.TArget = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TARGET"));
}
}
public string TRIGGER
{
get { return TRigger; }
set
{
this.TRigger = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TRIGGER"));
}
}
public int TRIGGERVALUE
{
get { return TRiggerVAlue; }
set
{
this.TRiggerVAlue = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("TRIGGERVALUE"));
}
}
}
Here is FirebaseHelper.cs, Note: I achieve the update function just for the TARGET Column, I suggest your to add a Primary-key(Auto-increase) for every record in your database to achieve your search function.
public class FirebaseHelper
{
public ObservableCollection<ViewProgramModel> _returnedEvents { get; set; }
public FirebaseHelper()
{
_returnedEvents = new ObservableCollection<ViewProgramModel>();
}
// internal ViewProgramModel MyViewProgramModel { get; set; }
FirebaseClient firebase = new FirebaseClient("https://xxxxxxxxxx.firebaseio.com/");
private readonly string ChildProgram = "ControllerData/xxxxxx_Pirate_1/Program";
public static IDisposable returnedEvents;
public async Task AddViewProgramModel()
{
//new ViewProgramModel() { MODE="test", TARGET=122, TRIGGER="122", TRIGGERVALUE=333, }
await firebase
.Child(ChildProgram)
.PostAsync( new ViewProgramModel() { MODE = "test", TARGET = 122, TRIGGER = "122", TRIGGERVALUE = 333, });
GetAllData();
}
public async Task UpdateViewProgramModel(ViewProgramModel viewProgramModel , string oldValue)
{
var toUpdatePerson = (await firebase
.Child(ChildProgram)
.OnceAsync<ViewProgramModel>()).FirstOrDefault(a => a.Object.TARGET == Convert.ToInt32( oldValue));
await firebase
.Child(ChildProgram)
.Child(toUpdatePerson.Key)
.PutAsync(viewProgramModel);
GetAllData();
}
public async Task DeleteViewProgramModel(string mode)
{
var toDeletePerson = (await firebase
.Child(ChildProgram)
.OnceAsync<ViewProgramModel>()).FirstOrDefault(a => a.Object.MODE == mode);
await firebase.Child(ChildProgram).Child(toDeletePerson.Key).DeleteAsync();
GetAllData();
}
public async void GetAllData()
{
_returnedEvents.Clear();
var programs = await firebase.Child(ChildProgram).OnceAsync<ViewProgramModel>();
for (int i = 0; i < programs.Count; i++)
{
_returnedEvents.Add(programs.ElementAt(i).Object);
}
}
public async void listenForEvents()
{
_returnedEvents.Clear();
var programs = await firebase.Child(ChildProgram).OnceAsync<ViewProgramModel>();
for (int i = 0; i < programs.Count; i++)
{
_returnedEvents.Add(programs.ElementAt(i).Object);
}
//returnedEvents = firebase.Child(ChildProgram).OrderByKey().AsObservable<ViewProgramModel>()
// .Subscribe(eventReceived =>
// {
// if (eventReceived.EventType == Firebase.Database.Streaming.FirebaseEventType.InsertOrUpdate)
// {
// var found = _returnedEvents.FirstOrDefault(i => i._KEY == eventReceived.Key);
// if (found == null)
// {
// // not in observable collection, add it
// _returnedEvents.Add(eventReceived.Object);
// }
// else
// {
// // event was updated
// int tempIndex = _returnedEvents.IndexOf(found);
// _returnedEvents[tempIndex] = eventReceived.Object;
// }
// }
//});
}
}
}
Here is CookPage.xaml
<StackLayout>
<Button Text="add" Clicked="Button_Clicked"></Button>
<Button Text="delete" Clicked="Button_Clicked_1"></Button>
<Syncfusion:SfDataGrid x:Name="sfGrid" ItemsSource="{Binding _returnedEvents, Mode=TwoWay} " >
</Syncfusion:SfDataGrid>
</StackLayout>
Here is code about CookPage.cs.
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class CookPage : ContentPage
{
FirebaseHelper firebaseHelper = new FirebaseHelper();
public CookPage()
{
InitializeComponent();
// for Syncfusion DataGrid
firebaseHelper.listenForEvents();
//sfGrid.ItemsSource = ViewProgramModel._returnedEvents;
BindingContext= firebaseHelper;
sfGrid.ColumnSizer = ColumnSizer.Star;
sfGrid.AllowEditing = true;
sfGrid.NavigationMode = NavigationMode.Cell;
sfGrid.AllowLoadMore = true;
sfGrid.AutoGenerateColumns = true;
//sfGrid.AutoGenerateColumnsMode= AutoGenerateColumnsMode.
sfGrid.SelectionMode = Syncfusion.SfDataGrid.XForms.SelectionMode.Single;
sfGrid.AllowPullToRefresh = true;
sfGrid.CurrentCellEndEdit += SfGrid_CurrentCellEndEdit; ;
}
private async void SfGrid_CurrentCellEndEdit(object sender, GridCurrentCellEndEditEventArgs e)
{
//throw new System.NotImplementedException();
var selectObj = sender as SfDataGrid;
RowColumnIndex index = e.RowColumnIndex;
int selectColumnIndex = index.ColumnIndex; //2
int selectRowIndex = index.RowIndex; //3
var ob=firebaseHelper._returnedEvents;
ViewProgramModel selectObject =ob[selectRowIndex-1];
var newVale = e.NewValue.ToString();
var oldeValue = e.OldValue.ToString();
//Here just judge TARGET Column, you should judge all Columns
if (selectColumnIndex == 2)
{
selectObject.TARGET = Convert.ToInt32(newVale);
}
//If you want to achieve the all Grid change function, you should judge the selectRowIndex for every change
//if (selectRowIndex==1)
//{
// selectObject.MODE = newVale;
//}else if (selectRowIndex==2)
//{
// selectObject.TARGET = Convert.ToInt32( newVale);
//}else if (selectRowIndex == 3)
//{
// selectObject.TRIGGER = newVale;
//}else if (selectRowIndex == 4)
//{
// selectObject.TRIGGERVALUE = Convert.ToInt32(newVale);
//}
await firebaseHelper.UpdateViewProgramModel(selectObject, oldeValue);
}
private async void Button_Clicked(object sender, System.EventArgs e)
{
await firebaseHelper.AddViewProgramModel();
}
private async void Button_Clicked_1(object sender, System.EventArgs e)
{
await firebaseHelper.DeleteViewProgramModel("test");
}
}