Windowphone访问网络图片-本地缓存-封装CacheNetworkFile.dll的学习
<div id="cnblogs_post_body">这篇博文是我根据一个缓存网络图片的demo的学习总结。在这个例子中调用的是CacheNetworkFile.dll中的CacheNetworkImageConvert来进行缓存网络图片的。这个CacheNetworkFile.dll里面到底是什么东东呢？
经过神器Reflector的分析原来如此呀
类CacheNetworkImageConvert实现了IvalueConverter接口
<div class="cnblogs_code" >http://images.cnblogs.com/OutliningIndicators/ContractedBlock.gifhttp://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gifView Code <div id="cnblogs_code_open_632403e8-e6c6-44d8-9ac4-b976fa08036a" class="cnblogs_code_hide">public class CacheNetworkImageConvert : IValueConverter{ // Methods public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { Uri uri; BitmapImage2 image; if (value != null) { uri = null; if (value is string) { uri = new Uri((string) value); goto Label_0030; } if (value is Uri) { uri = (Uri) value; goto Label_0030; } } return null; Label_0030: image = new BitmapImage2(); CacheNetworkdFile.AddBind(uri, image, BitmapImage2.Source);//调用CacheNetWorkFile的Addbind方法来保存File return image; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } // Nested Types private class BitmapImage2 : BitmapSource { // Fields public static DependencyProperty Source = DependencyProperty.Register("Source", typeof(Stream), typeof(CacheNetworkImageConvert.BitmapImage2), new PropertyMetadata(null, new PropertyChangedCallback(null, (IntPtr) SourceChanged))); // Methods private static void SourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ((CacheNetworkImageConvert.BitmapImage2) d).SetSource((Stream) e.get_NewValue()); ((Stream) e.get_NewValue()).Dispose(); } }}
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