Image控件的属性扩展

╰半橙微兮° 2022-04-22 07:00 228阅读 0赞

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"

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