在Xamarin中将Grid.RowDefinition高度绑定到网格的宽度

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="{Binding GridWidth, Converter={StaticResource GridHeightConverter}}"/>
        <!-- 其他行定义 -->
    </Grid.RowDefinitions>
</Grid>

public class ViewModel : INotifyPropertyChanged
{
    private double _gridWidth;
    public double GridWidth
    {
        get { return _gridWidth; }
        set
        {
            if (_gridWidth != value)
            {
                _gridWidth = value;
                OnPropertyChanged(nameof(GridWidth));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        BindingContext = new ViewModel();
    }
}