realtime uppdate

Eduardo Gomez Romero 525 Reputation points
2024-10-01T20:29:59.3+00:00

I have a service that start a timer

    public class TurbinesService(DeviceLanguageService deviceLanguageService) {

        private const int HoursDay = 24;
        private const int MinutesDay = 60;
        private const double IncrementValue = 0.0007;
        private readonly DeviceLanguageService _deviceLanguageService = deviceLanguageService;
        private bool isRunning;
        private ObservableCollection<TurbinePin> _turbinePins = [];

        public ObservableCollection<TurbinePin> GetTurbinePins(ICommand pinClickedCommand) {
            _turbinePins = [
                new() {
                Turbine = new Turbine(_deviceLanguageService) {
                    Id = 1,
                    Name = "Solar Generator",
                    Label = "Charge station",
                    Address = "Av. de las Américas, Guayaquil 090513, Ecuador",
                    Location = new Location(-2.151993, -79.886109),
                    InstalationDateTime = new DateTime(2024, 8, 2),
                    Images = ["charge_station.png", "wind_turbine.png"]
                },
                PinClickedCommand = pinClickedCommand
            }
            ];

            foreach (var pin in _turbinePins) {
                CalculateAndSetValues(pin.Turbine!);
            }

            return _turbinePins;
        }

        public void StartIncrementingAllTurbines() {
            if (!isRunning) {
                isRunning = true;
                foreach (var pin in _turbinePins) {
                    StartIncrementingRemovedCo2Kilograms(pin.Turbine!);
                }
            }
        }

        private void CalculateAndSetValues(Turbine turbine) {
            var energyPerDay = RoundToDecimals(turbine.TurbinePower * turbine.TurbineCapacityFactor * HoursDay);
            var energyPerHour = RoundToDecimals(energyPerDay / HoursDay, 4);
            var energyPerSecond = RoundToDecimals(energyPerHour / MinutesDay, 5);
            var removedCo2PerSecond = RoundToDecimals(energyPerSecond * turbine.TurbineEmissionOffset, 5);
            var daysPassedSinceInstallation = (DateTime.Today - turbine.InstalationDateTime).Days;
            var energyProduced = RoundToDecimals(energyPerDay * daysPassedSinceInstallation);
            var removedCo2Kilograms = RoundToDecimals(turbine.CalculatedRemovedCo2Kilograms, 3);

            turbine.RemovedCo2Kilograms = removedCo2Kilograms;
            Debug.WriteLine($"Initial RemovedCo2Kilograms: {turbine.RemovedCo2Kilograms}");
        }

        private async void StartIncrementingRemovedCo2Kilograms(Turbine turbine) {
            while (isRunning) {
                await Task.Delay(1000);  // Increment every second

                // Increment RemovedCo2Kilograms by 0.0007
                UpdateRemovedCo2Kilograms(turbine, IncrementValue);
            }
        }

        private void UpdateRemovedCo2Kilograms(Turbine turbine, double increment) {
            turbine.RemovedCo2Kilograms += increment;

            // Round to 3 decimal places
            turbine.RemovedCo2Kilograms = RoundToDecimals(turbine.RemovedCo2Kilograms, 3);
            Debug.WriteLine($"Updated RemovedCo2Kilograms: {turbine.RemovedCo2Kilograms}");
        }

        private double RoundToDecimals(double value, int decimals = 2) {
            return Math.Round(value, decimals);
        }
    }
}


And I call this OnAppStart so it will start the timer

 public App(AppShell appShell, TurbinesService _turbinesService) {
     Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense(AppConstants.SYNCFUSION_KEY);

     InitializeComponent();

     MainPage = appShell;

     turbinesService = _turbinesService;
 }

 protected override void OnStart() {
     base.OnStart();
     // Start the incrementation logic here
     turbinesService.StartIncrementingAllTurbines();
 }

I want to use this in two places

    public partial class TurbinesCollectionPageViewModel(TurbinesService turbinesService)
        : ChargingStationsMapPageViewModel(turbinesService) {

    }

  <CollectionView.ItemTemplate>
      <DataTemplate x:DataType="model:TurbinePin">
          <Grid>
              <Border Style="{StaticResource CommonBorderStyle}">
                  <Grid
                      ColumnDefinitions="Auto,*"
                      RowDefinitions="30,*,*">
                      <Label
                          Style="{StaticResource CommonLabelStyle}"
                          Text="{Binding Turbine.Name}" />
                      <Label
                          Grid.Row="1"
                          Style="{StaticResource CommonLabelStyle}"
                          Text="{Binding Turbine.Address}" />
                      <Label
                          Grid.Row="2"
                          Style="{StaticResource CommonLabelStyle}"
                          Text="{Binding Turbine.LocalizedInstalationDateTime}" />

                      <Label
                          Grid.RowSpan="3"
                          Grid.Column="1"
                          Grid.ColumnSpan="2"
                          Text="{Binding Turbine.RemovedCo2Kilograms}"
                          VerticalOptions="Center"
                          VerticalTextAlignment="Center" />

and here

 [QueryProperty(nameof(SelectedTurbine), "SelectedTurbine")]
 public partial class TurbineDetailPageViewModel : ObservableObject {
     [ObservableProperty]
     Turbine? selectedTurbine;
     [RelayCommand]
     void Appear() {
         if (SelectedTurbine == null) {
             return;
         }
     }
<Border
    Grid.Row="4"
    Grid.Column="1"
    Padding="5">
    <Label
        BackgroundColor="Yellow"
        FontAttributes="Bold"
        HorizontalTextAlignment="Center"
        Text="{Binding SelectedTurbine.RemovedCo2Kilograms, StringFormat='{0} kg Co2'}" />
</Border>


but it doesn't update in real time, is not incrementing (I just see a static number)

User's image

Net 8

Maui 8.0.9

.NET MAUI
.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
3,486 questions
{count} votes

Accepted answer
  1. Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,166 Reputation points Microsoft Vendor
    2024-10-02T07:25:00.0666667+00:00

    Hello,

    As you said, you have resolved the problem.

    I was using this

    private async void StartIncrementingRemovedCo2Kilograms(Turbine turbine) {
                while (isRunning) {
                    await Task.Delay(1000);  // Increment every second
    
                    // Increment RemovedCo2Kilograms by 0.0007
                    UpdateRemovedCo2Kilograms(turbine, IncrementValue);
                }
            }
    
            private void UpdateRemovedCo2Kilograms(Turbine turbine, double increment) {
                turbine.RemovedCo2Kilograms += increment;
    
                // Round to 3 decimal places
                turbine.RemovedCo2Kilograms = RoundToDecimals(turbine.RemovedCo2Kilograms, 3);
                Debug.WriteLine($"Updated RemovedCo2Kilograms: {turbine.RemovedCo2Kilograms}");
            }
    
            private double RoundToDecimals(double value, int decimals = 2) {
                return Math.Round(value, decimals);
            }
        }
    
    
    

    What I should have done is

           public TurbinesService(DeviceLanguageService deviceLanguageService, IDispatcher application) {
               _deviceLanguageService = deviceLanguageService;
               _dispatcher = application;
               InitializeTimer(); // Just initialize the timer, do not start it here
    
           }
    
           // Initialize the timer
           private void InitializeTimer() {
               _timer = _dispatcher.CreateTimer(); // Use the injected dispatcher
               _timer.Interval = TimeSpan.FromSeconds(1);
               _timer.Tick += (s, e) => UpdateTurbinesCo2();
           }
    
           public ObservableCollection<TurbinePin> GetTurbinePins(ICommand pinClickedCommand) {
               _turbinePins = [
                   new() {
                       Turbine = new Turbine(_deviceLanguageService) {
                           Id = 1,
                           Name = "Estación Ciudadela Simón Bolívar",
                           Label = "Charge station",
                           Address = "Av. de las Américas, Guayaquil 090513, Ecuador",
                           Location = new Location(-2.151993, -79.886109),
                           InstalationDateTime = new DateTime(2024, 8, 2),
                           Images = ["charge_station.png", "wind_turbine.png"]
                       },
                       PinClickedCommand = pinClickedCommand
                   }
               ];
    
               foreach (var pin in _turbinePins) {
                   CalculateAndSetValues(pin.Turbine!);
               }
    
               // Do not start the timer here
               return _turbinePins;
           }
    
           // Start the timer explicitly
           public void StartTimer() {
               if (!isTimerRunning) {
                   _timer!.Start();
                   isTimerRunning = true;
               }
           }
    
           // Method to handle updating CO2 every second
           private void UpdateTurbinesCo2() {
               foreach (var pin in _turbinePins) {
                   var turbine = pin.Turbine;
                   if (turbine != null) {
                       turbine.RemovedCo2Kilograms += turbine.RemovedCo2PerSecond;  // Update CO2 every second
                       turbine.RemovedCo2Kilograms = RoundToDecimals(turbine.RemovedCo2Kilograms, 3);
                   }
               }
           }
    
    

    and register a dispatcher as a dependency

    Thanks for your sharing.

    Best Regards,

    Wenyan Zhang


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