IDispatcherTimer timer not stopping in timer.stop();

Question

In this MAUI.NET app below the timer doesn't stop on timer.stop();

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ButtonTimer.MainPage">

    <ScrollView>
        <VerticalStackLayout
            Spacing="25"
            Padding="30,0"
            VerticalOptions="Center">

            <Button
                x:Name="CounterBtn"
                Text="Start"
                SemanticProperties.Hint="Counts the number of times you click"
                Clicked="OnCounterClicked"
                HorizontalOptions="Center" />

        </VerticalStackLayout>
    </ScrollView>

</ContentPage>

using System.Diagnostics;

namespace ButtonTimer;

public partial class MainPage : ContentPage
{
	int count = 0;
    IDispatcherTimer timer;


    public MainPage()
	{
		InitializeComponent();
	}

    
    private void OnCounterClicked(object sender, EventArgs e)
	{
        timer = Application.Current.Dispatcher.CreateTimer();
        timer.Interval = TimeSpan.FromSeconds(1);
        timer.Tick += (s, e) => Go();

        if (CounterBtn.Text == "Start")
		{
            timer.Start();
			CounterBtn.Text = "Stop";
		}
		else
		{
            timer.Stop();
            CounterBtn.Text = "Start";
        }

	}
    public void Go()
    {
        Debug.WriteLine("Ping");
    }
}

Answer 1

Try this:

. . .
public MainPage( )
{
    InitializeComponent( );

    timer = Application.Current.Dispatcher.CreateTimer( );
    timer.Interval = TimeSpan.FromSeconds( 1 );
    timer.Tick += ( s, e ) => Go( );
}

private void OnCounterClicked( object sender, EventArgs e )
{
    if( CounterBtn.Text == "Start" )
    {
. . .