using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Media;using System.Windows.Media.Imaging;namespace WpfCopy.Controls{    class CacheImageControl : Control    {        public bool IsShare        {            get { return (bool)GetValue(IsSharesShareFileProperty); }            set { SetValue(IsSharesShareFileProperty, value); }        }        public static readonly DependencyProperty IsSharesShareFileProperty =            DependencyProperty.Register("IsShare", typeof(bool), typeof(CacheImageControl), new PropertyMetadata(false));        public int ClientId        {            get { return (int)GetValue(ClientIdProperty); }            set { SetValue(ClientIdProperty, value); }        }        // Using a DependencyProperty as the backing store for ClientId.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty ClientIdProperty =            DependencyProperty.Register("ClientId", typeof(int), typeof(CacheImageControl), new PropertyMetadata(0));        public ImageSource ImageSource        {            get { return (ImageSource)GetValue(ImageSourceProperty); }            set { SetValue(ImageSourceProperty, value); }        }        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty ImageSourceProperty =            DependencyProperty.Register("MyProperty", typeof(ImageSource), typeof(CacheImageControl));        public string ImagePath        {            get { return (string)GetValue(ImagePathProperty); }            set { SetValue(ImagePathProperty, value); }        }        // Using a DependencyProperty as the backing store for ImagePath.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty ImagePathProperty =            DependencyProperty.Register("ImagePath", typeof(string), typeof(CacheImageControl), new PropertyMetadata(null, OnImagePathChanged));        public bool IsFailed        {            get { return (bool)GetValue(IsFailedProperty); }            set { SetValue(IsFailedProperty, value); }        }        // Using a DependencyProperty as the backing store for IsFailed.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty IsFailedProperty =            DependencyProperty.Register("IsFailed", typeof(bool), typeof(CacheImageControl), new PropertyMetadata(false));        public bool IsLoading        {            get { return (bool)GetValue(IsLoadingProperty); }            set { SetValue(IsLoadingProperty, value); }        }        // Using a DependencyProperty as the backing store for IsLoading.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty IsLoadingProperty =            DependencyProperty.Register("IsLoading", typeof(bool), typeof(CacheImageControl), new PropertyMetadata(false));        public bool IsEmpty        {            get { return (bool)GetValue(IsEmptyProperty); }            set { SetValue(IsEmptyProperty, value); }        }        // Using a DependencyProperty as the backing store for IsEmpty.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty IsEmptyProperty =            DependencyProperty.Register("IsEmpty", typeof(bool), typeof(CacheImageControl), new PropertyMetadata(true));        public static readonly RoutedEvent ImagePathChangedEvent = EventManager.RegisterRoutedEvent("ImagePathChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(CacheImageControl));        public event RoutedEventHandler ImagePathChanged        {            add { AddHandler(ImagePathChangedEvent, value); }            remove { RemoveHandler(ImagePathChangedEvent, value); }        }        static CacheImageControl()        {            DefaultStyleKeyProperty.OverrideMetadata(typeof(CacheImageControl), new FrameworkPropertyMetadata(typeof(CacheImageControl)));        }        public static void OnImagePathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)        {            var sender = d as CacheImageControl;            if (sender != null)            {                var oldValue = http://www.mamicode.com/e.OldValue as string;>　　　　　　　　　 //下载远程图片到本地，下载完成后保存到本地并回调Call_Back方法，呈现本地图片                FileCacheMgr.Instance.GetUserFile(newValue, ClientId, CacheFileEventHandler_CallBack);            }        }　　　　 ///显示下载图片        void CacheFileEventHandler_CallBack(object sender, CacheFileEventArgs e)        {            if (Application.Current == null) return;            Application.Current.Dispatcher.BeginInvoke(new Action<CacheFileEventArgs>(E =>            {                IsLoading = false;                if (E.IsFaulted)                {                    IsFailed = true;                }                else                {                    ImageSource = new BitmapImage(new Uri(Path.GetFullPath(E.CacheFile.LocalFile), UriKind.Absolute));                }            }), e);        }    }}