使用星号将Wpf宽度绑定到属性

public class ViewModel : INotifyPropertyChanged
{
    private double _buttonWidth;
    public double ButtonWidth
    {
        get { return _buttonWidth; }
        set
        {
            _buttonWidth = value;
            OnPropertyChanged(nameof(ButtonWidth));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

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

public MainWindow()
{
    InitializeComponent();
    this.DataContext = new ViewModel() { ButtonWidth = 200 };
}

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Button Width="{Binding ButtonWidth}" Content="Click Me" />
    </Grid>
</Window>