게으른 한 영혼의 이야기 :: IValueConverter 를 이용한 Percentage 로 Binding 하기

Windows1 > canvas > rectange 의 구조에서,
Rectange Width 를 Canvas Width 의 90% 로 Binding 하는 예제

IValueConverter 를 사용.

namespace WpfApplication2.Converter
{
    using System;
    using System.Windows.Data;
    public class PercentageConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return System.Convert.ToDouble(value) * System.Convert.ToDouble(parameter);
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

<Window x:Class="WpfApplication2.Window1"
    xmlns="<A href="http://schemas.microsoft.com/winfx/2006/xaml/presentation">http://schemas.microsoft.com/winfx/2006/xaml/presentation</A>"
    xmlns:x="<A href="http://schemas.microsoft.com/winfx/2006/xaml">http://schemas.microsoft.com/winfx/2006/xaml</A>"
    xmlns:Converter="clr-namespace:WpfApplication2.Converter"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <Converter:PercentageConverter x:Key="PercentageConverter" />
    </Window.Resources>
    <Canvas x:Name="canvas">
        <Rectangle Width="{Binding Converter={StaticResource PercentageConverter}, ElementName=canvas, Path=ActualWidth, ConverterParameter=0.9}" Height="100" Fill="Chocolate"></Rectangle>
    </Canvas>
</Window>

WpfApplication2.zip