Я редактирую ваше демо, я достигаю обновления, добавления, удаления функции.
Здесь работает GIF.
Я изменяю ваш ViewProgramModel как следующий код. Просто переместите _returnedEvents в 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"));
}
}
}
Вот FirebaseHelper.cs, Примечание: я получаю функцию обновления только для столбца TARGET, я предлагаю вам добавить первичный ключ (Авто-увеличение) для каждой записи в вашей базе данных для достижения вашей функции поиска.
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;
// }
// }
//});
}
}
}
Вот 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>
Вот код около 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");
}
}