UWP DataGrid列绑定到可以为空的双精度值，但修改单元格不会修改该属性

public class DataItem
{
    public double? Value { get; set; }
    // 其他属性...
}

<DataGrid ItemsSource="{x:Bind YourDataCollection}">
    <!-- 列定义 -->
</DataGrid>

<DataGridTextColumn Header="Value" Binding="{Binding Value}" />
<!-- 其他列定义... -->

public class DataItem : INotifyPropertyChanged
{
    private double? _value;
    public double? Value
    {
        get { return _value; }
        set
        {
            if (_value != value)
            {
                _value = value;
                OnPropertyChanged(nameof(Value));
            }
        }
    }

    // 其他属性...

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