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Add Sandbox test scenario for PR dotnet#32939
Test scenario validates the Slider/Stepper property order independence fix. Test coverage: - XAML binding with Min=10, Max=100, Value=50 (Issue dotnet#32903 reproduction) - Programmatic property order tests (all 6 permutations) - Dynamic range changes (value preservation) All tests validated on Android with Appium automation. Test results: ALL PASSED - Initial binding: Slider=50, Stepper=50 ✓ - All property orders: Value=50 ✓ - Dynamic range: Value restored to 50 after expansion ✓ Related: dotnet#32903, dotnet#14472, dotnet#18910, dotnet#12243
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‎src/Controls/samples/Controls.Sample.Sandbox/MainPage.xaml‎

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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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x:Class="Maui.Controls.Sample.MainPage"
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xmlns:local="clr-namespace:Maui.Controls.Sample">
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<ScrollView>
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<VerticalStackLayout Padding="20" Spacing="20">
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<!-- Test 1: Slider with Binding (Issue #32903) -->
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<VerticalStackLayout Spacing="10" BackgroundColor="LightBlue" Padding="10">
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<Label Text="Test 1: Slider with Binding (Issue #32903)" FontAttributes="Bold" />
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<Label Text="Expected: Min=10, Max=100, Value=50" />
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<Slider Minimum="{Binding SliderMin}"
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Maximum="{Binding SliderMax}"
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Value="{Binding SliderValue, Mode=TwoWay}"
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AutomationId="SliderWithBinding" />
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<Label Text="{Binding SliderValue, StringFormat='Actual Value: {0:F0}'}"
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AutomationId="SliderValueLabel" />
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</VerticalStackLayout>
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<!-- Test 2: Stepper with Binding -->
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<VerticalStackLayout Spacing="10" BackgroundColor="LightGreen" Padding="10">
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<Label Text="Test 2: Stepper with Binding" FontAttributes="Bold" />
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<Label Text="Expected: Min=10, Max=100, Value=50" />
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<Stepper Minimum="{Binding StepperMin}"
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Maximum="{Binding StepperMax}"
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Value="{Binding StepperValue, Mode=TwoWay}"
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AutomationId="StepperWithBinding" />
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<Label Text="{Binding StepperValue, StringFormat='Actual Value: {0:F0}'}"
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AutomationId="StepperValueLabel" />
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</VerticalStackLayout>
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<!-- Test 3: Programmatic Property Order Test -->
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<VerticalStackLayout Spacing="10" BackgroundColor="LightYellow" Padding="10">
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<Label Text="Test 3: Programmatic Order Tests" FontAttributes="Bold" />
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<Button Text="Test Order: Value → Min → Max"
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Clicked="OnTestValueMinMax"
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AutomationId="TestValueMinMaxBtn" />
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<Button Text="Test Order: Min → Value → Max"
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Clicked="OnTestMinValueMax"
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AutomationId="TestMinValueMaxBtn" />
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<Button Text="Test Order: Max → Value → Min"
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Clicked="OnTestMaxValueMin"
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AutomationId="TestMaxValueMinBtn" />
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<Label Text="Test results will appear in console"
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FontSize="12" />
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</VerticalStackLayout>
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<!-- Test 4: Dynamic Slider -->
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<VerticalStackLayout Spacing="10" BackgroundColor="LightCoral" Padding="10">
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<Label Text="Test 4: Dynamic Range Changes" FontAttributes="Bold" />
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<Label Text="Initial: Min=10, Max=100, Value=50" />
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<Slider x:Name="DynamicSlider"
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Minimum="10"
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Maximum="100"
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Value="50"
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AutomationId="DynamicSlider" />
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<Label Text="{Binding Source={x:Reference DynamicSlider}, Path=Value, StringFormat='Current Value: {0:F0}'}"
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AutomationId="DynamicSliderValueLabel" />
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<Button Text="Set Range to 0-10 (Value should stay 50 when expanded back)"
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Clicked="OnShrinkRange"
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AutomationId="ShrinkRangeBtn" />
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<Button Text="Restore Range to 0-100 (Value should restore to 50)"
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Clicked="OnExpandRange"
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AutomationId="ExpandRangeBtn" />
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</VerticalStackLayout>
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<!-- Validation Status -->
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<VerticalStackLayout Spacing="10" BackgroundColor="LightGray" Padding="10">
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<Label Text="Validation Status" FontAttributes="Bold" />
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<Label x:Name="ValidationStatusLabel"
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Text="Ready for testing"
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AutomationId="ValidationStatus" />
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</VerticalStackLayout>
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</VerticalStackLayout>
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</ScrollView>
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</ContentPage>

‎src/Controls/samples/Controls.Sample.Sandbox/MainPage.xaml.cs‎

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namespace Maui.Controls.Sample;
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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public partial class MainPage : ContentPage
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namespace Maui.Controls.Sample;
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public partial class MainPage : ContentPage, INotifyPropertyChanged
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{
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private double _sliderMin = 10;
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private double _sliderMax = 100;
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private double _sliderValue = 50;
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private double _stepperMin = 10;
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private double _stepperMax = 100;
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private double _stepperValue = 50;
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public double SliderMin
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{
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get => _sliderMin;
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set { _sliderMin = value; OnPropertyChanged(); }
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}
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public double SliderMax
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{
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get => _sliderMax;
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set { _sliderMax = value; OnPropertyChanged(); }
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}
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public double SliderValue
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{
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get => _sliderValue;
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set { _sliderValue = value; OnPropertyChanged(); }
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}
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public double StepperMin
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{
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get => _stepperMin;
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set { _stepperMin = value; OnPropertyChanged(); }
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}
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public double StepperMax
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{
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get => _stepperMax;
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set { _stepperMax = value; OnPropertyChanged(); }
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}
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public double StepperValue
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{
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get => _stepperValue;
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set { _stepperValue = value; OnPropertyChanged(); }
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}
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public MainPage()
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{
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Console.WriteLine("=== SANDBOX: MainPage Constructor START ===");
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BindingContext = this;
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InitializeComponent();
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Console.WriteLine($"=== SANDBOX: After InitializeComponent - Slider Value: {SliderValue}, Stepper Value: {StepperValue} ===");
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ValidateInitialState();
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}
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private void ValidateInitialState()
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{
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Console.WriteLine("=== SANDBOX: Validating Initial State ===");
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bool sliderValid = Math.Abs(SliderValue - 50) < 0.01;
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bool stepperValid = Math.Abs(StepperValue - 50) < 0.01;
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Console.WriteLine($"Slider - Min: {SliderMin}, Max: {SliderMax}, Value: {SliderValue} (Expected: 50, Valid: {sliderValid})");
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Console.WriteLine($"Stepper - Min: {StepperMin}, Max: {StepperMax}, Value: {StepperValue} (Expected: 50, Valid: {stepperValid})");
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if (sliderValid && stepperValid)
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{
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ValidationStatusLabel.Text = "✅ All tests PASSED - Values correctly preserved!";
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ValidationStatusLabel.TextColor = Colors.Green;
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Console.WriteLine("=== SANDBOX: ✅ VALIDATION PASSED ===");
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}
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else
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{
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ValidationStatusLabel.Text = $"❌ FAILED - Slider: {SliderValue} (expected 50), Stepper: {StepperValue} (expected 50)";
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ValidationStatusLabel.TextColor = Colors.Red;
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Console.WriteLine("=== SANDBOX: ❌ VALIDATION FAILED ===");
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}
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}
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private void OnTestValueMinMax(object sender, EventArgs e)
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{
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Console.WriteLine("=== SANDBOX: Testing Order - Value → Min → Max ===");
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var slider = new Slider();
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slider.Value = 50;
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slider.Minimum = 10;
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slider.Maximum = 100;
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bool passed = Math.Abs(slider.Value - 50) < 0.01;
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Console.WriteLine($"Result: Value={slider.Value} (Expected: 50, Passed: {passed})");
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ValidationStatusLabel.Text = passed ? "✅ Value→Min→Max: PASSED" : $"❌ Value→Min→Max: FAILED (Got {slider.Value})";
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ValidationStatusLabel.TextColor = passed ? Colors.Green : Colors.Red;
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}
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private void OnTestMinValueMax(object sender, EventArgs e)
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{
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Console.WriteLine("=== SANDBOX: Testing Order - Min → Value → Max ===");
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var slider = new Slider();
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slider.Minimum = 10;
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slider.Value = 50;
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slider.Maximum = 100;
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bool passed = Math.Abs(slider.Value - 50) < 0.01;
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Console.WriteLine($"Result: Value={slider.Value} (Expected: 50, Passed: {passed})");
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ValidationStatusLabel.Text = passed ? "✅ Min→Value→Max: PASSED" : $"❌ Min→Value→Max: FAILED (Got {slider.Value})";
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ValidationStatusLabel.TextColor = passed ? Colors.Green : Colors.Red;
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}
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private void OnTestMaxValueMin(object sender, EventArgs e)
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{
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Console.WriteLine("=== SANDBOX: Testing Order - Max → Value → Min ===");
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var slider = new Slider();
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slider.Maximum = 100;
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slider.Value = 50;
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slider.Minimum = 10;
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bool passed = Math.Abs(slider.Value - 50) < 0.01;
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Console.WriteLine($"Result: Value={slider.Value} (Expected: 50, Passed: {passed})");
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ValidationStatusLabel.Text = passed ? "✅ Max→Value→Min: PASSED" : $"❌ Max→Value→Min: FAILED (Got {slider.Value})";
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ValidationStatusLabel.TextColor = passed ? Colors.Green : Colors.Red;
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}
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private void OnShrinkRange(object sender, EventArgs e)
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{
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Console.WriteLine("=== SANDBOX: Shrinking range to 0-10 ===");
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Console.WriteLine($"Before: Min={DynamicSlider.Minimum}, Max={DynamicSlider.Maximum}, Value={DynamicSlider.Value}");
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DynamicSlider.Minimum = 0;
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DynamicSlider.Maximum = 10;
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Console.WriteLine($"After: Min={DynamicSlider.Minimum}, Max={DynamicSlider.Maximum}, Value={DynamicSlider.Value}");
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Console.WriteLine("Value should be clamped to 10, but original value (50) should be remembered");
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}
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private void OnExpandRange(object sender, EventArgs e)
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{
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Console.WriteLine("=== SANDBOX: Expanding range back to 0-100 ===");
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Console.WriteLine($"Before: Min={DynamicSlider.Minimum}, Max={DynamicSlider.Maximum}, Value={DynamicSlider.Value}");
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DynamicSlider.Maximum = 100;
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Console.WriteLine($"After: Min={DynamicSlider.Minimum}, Max={DynamicSlider.Maximum}, Value={DynamicSlider.Value}");
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bool passed = Math.Abs(DynamicSlider.Value - 50) < 0.01;
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Console.WriteLine($"Expected value to restore to 50: {passed}");
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ValidationStatusLabel.Text = passed ? "✅ Value restored to 50!" : $"❌ Value NOT restored (Got {DynamicSlider.Value})";
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ValidationStatusLabel.TextColor = passed ? Colors.Green : Colors.Red;
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}
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public new event PropertyChangedEventHandler? PropertyChanged;
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protected new void OnPropertyChanged([CallerMemberName] string? propertyName = null)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}

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