Image控件的属性扩展

    扩展Image的属性，显示Web下的图片。

 

    对Image的属性进行扩展：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Imaging;

namespace Longshine.SLLib.LSControlPropertyExtend
{
    /// <summary>
    /// 描述：用来显示web下的图片
    /// </summary>
    public class ImageSource
    {
        private Image images;
        public ImageSource(Image _img)
        {
            images = _img;
        }
        public static void SetUrlSource(DependencyObject dependencyObject, string value)
        {
            dependencyObject.SetValue(UrlSourceProperty, value);
        }

        public static string GetUrlSource(DependencyObject dependencyObject)
        {
            return (string)dependencyObject.GetValue(UrlSourceProperty);
        }

        // Using a DependencyProperty as the backing store for UrlSource.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty UrlSourceProperty =
            DependencyProperty.RegisterAttached("UrlSource", typeof(string), typeof(ImageSource), new PropertyMetadata("", new PropertyChangedCallback(SetSource)));

        private static void SetSource(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            Image images = o as Image;
            if (images != null)
            {
                Uri u = new Uri(Application.Current.Host.Source, e.NewValue.ToString());

                BitmapImage imgsrc = new BitmapImage(u);

                images.Source = imgsrc;
            }
        }


    }
}

 

   扩展属性的使用：

 

xmlns:ext="clr-namespace:Longshine.SLLib.LSControlPropertyExtend;assembly=Longshine.SLLib"

 

<Image  ext:ImageSource.UrlSource="../img/printer.png"  Stretch="None" ></Image>

   注意： printer.png图片在Web工程的ClientBin文件的img文件中

 

   扩展属性的延伸：

   这种属性扩展方法都可以应用到任何Silverlight控件中，包括菜单、GridView等