单击另一页按钮后重新加载页面 - Xamarin

Question

I have 2 pages, one where I insert data into a Firebase database, let's call it Page2 and one where I display the Firebase Data, Page1.

I have a button click argument on Page2 where I insert data into the database but want to reload Page1 after this. It is structured like this (Page2.xaml.cs):

        void btInsert_Clicked(System.Object sender, System.EventArgs e)
    {
       //Firebase connection
       //Firebase data insertion
       //Code to reload Page1
      
    }

On my page 1 I have my database connection and display

Page1.xaml.cs:

        public Page1()
    {
        InitializeComponent();

        BindingContext = this;
        
        var collection = firebaseClient
            .Child("Childname")
            .AsObservable<MyDatabaseRecord>()
            .Subscribe((dbevent) =>
            {
                if (dbevent != null)
                {
                    DatabaseItems.Add(dbevent.Object);
                }
            });
    }

Page1.xaml:

    <StackLayout Margin="15,0,15,5" BackgroundColor="Navy">
    <CollectionView ItemsSource="{Binding DatabaseItems}">
        <CollectionView.ItemTemplate>
            <DataTemplate>
                <StackLayout>
                    <Frame BackgroundColor="Blue" HorizontalOptions="Center" Margin="0,0,0,17" Padding="2" WidthRequest="350" CornerRadius="20">
                        <StackLayout BackgroundColor="Blue">
                            <Label Text="{Binding Data1}" TextColor="White" FontAttributes="Bold" HorizontalOptions="Center" Margin="0, 5, 0, 0" FontSize="20"/>
                            <Label Text="{Binding Data2}" TextColor="White" Margin="10, 0, 0, 0" FontSize="15"/>
                            <Label Text="{Binding Data3}" TextColor="White" Margin="10, 0, 0, 0" FontSize="15"/>
                            <Label Text="{Binding Data4}" TextColor="White" Margin="10, 0, 0, 0" FontSize="15"/>
                            <Label Text="{Binding Data5}" TextColor="White" Margin="10, 0, 0, 20" FontSize="15"/>
                        </StackLayout>
                    </Frame>
                </StackLayout>
            </DataTemplate>
        </CollectionView.ItemTemplate>
    </CollectionView>
</StackLayout>

How can I approach this?

Thanks in advance.

Answer 1

There are two ways to solve this problem:

1. Using MessagingCenter : You can use MessagingCenter.Send<MainPage>(this, "Hi"); to send.

   Then use below code to receive information:

    MessagingCenter.Subscribe<MainPage> (this, "Hi", (sender) => { // Do something whenever the "Hi" message is received });

   More information about MessagingCenter can be found here: https://learn.microsoft.com/en-us/xamarin/xamarin.forms/app-fundamentals/messaging-center

2. You can pass the collection as a parameter when the two pages are jumped and then modify the bound collection.

For arrays of data you bind, it is recommended that you use ObservableCollection to dynamically update data.