我在UI中有以下代码
<ListBox x:Name="scannedImageslist" ItemContainerStyle="{StaticResource ListBoxCustom}" Background="Gray" SelectionMode="Multiple" Grid.Column="1" Grid.Row="1" ItemsSource="{Binding }" ScrollViewer.PanningMode="Both" ScrollViewer.HorizontalScrollBarVisibility="Disabled" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<!--<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<Trigger Property="IsSelected" Value="true" >
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="Background" Value="Orange" />
<Setter Property="Foreground" Value="Black" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>-->
<!--<ListBox.Resources>
<gif:ImageConverter x:Key="UriToBitmapConverter" />
</ListBox.Resources>-->
<!--<ListBox.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="Black"/>
<GradientStop Color="#FF1E2A2F" Offset="1"/>
</LinearGradientBrush>
</ListBox.Background>-->
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" IsItemsHost="True" >
</WrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<!--<Border BorderBrush="#FFFF9800" BorderThickness="3" Width="120" Height="120" Padding="10" Margin="15" CornerRadius="10">-->
<!--Bind Image Path in Image Control-->
<!--<CheckBox Grid.Column="0" Grid.Row="0" VerticalAlignment="Top" HorizontalAlignment="Left" ToolTip="{Binding FullPath}" IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}, Path=IsSelected}"></CheckBox>-->
<Image Grid.Column="1" Grid.Row="0" Stylus.IsPressAndHoldEnabled="True" Stretch="None" HorizontalAlignment="Center" ToolTip="{Binding FullPath}" MouseRightButtonDown="Image_MouseRightButtonDown" >
<Image.Source>
<BitmapImage UriSource="{Binding FullPath}" DecodePixelWidth="200" CreateOptions="IgnoreImageCache" RenderOptions.BitmapScalingMode="HighQuality" VirtualizingPanel.VirtualizationMode="Recycling" CacheOption="OnLoad"> </BitmapImage>
</Image.Source>
<Image.LayoutTransform>
<TransformGroup>
<ScaleTransform CenterX="0" CenterY="0" ScaleX="{Binding ElementName=sliderzoom,Path=Value}" ScaleY="{Binding ElementName=sliderzoom,Path=Value}" />
</TransformGroup>
</Image.LayoutTransform>
</Image>
<TextBlock Grid.Column="1" Grid.Row="1" Text="{Binding ImageName}" TextAlignment="Center" VerticalAlignment="Bottom" Typography.SlashedZero="True" Typography.NumeralStyle="OldStyle" TextWrapping="Wrap" HorizontalAlignment="Center"></TextBlock>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
绑定类和属性是
public class ImageItem : INotifyPropertyChanged
{
#region Properties
public string FullPath { get; set; }
public string ImageName { get; set; }
public ImageItem(string fullPath)
{
FullPath = fullPath;
//SetImage(fullPath);
//Image = new BitmapImage(new Uri(@fullPath));
ImageName = System.IO.Path.GetFileNameWithoutExtension(fullPath);
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
使用上面的代码，Jpegs的加载速度比Tiff图像快10倍。这里的Tiff处理有什么问题，在性能方面有什么正确的方法？ 更新： 我使用了一个转换器，它就像Jpegs加载Tiff一样快，但问题不是解码，内存被吃掉了。
public class UriConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (Path.GetExtension(value.ToString()).ToUpper() == ".TIF")
{
Stream tiff = new System.IO.FileStream(value.ToString(), FileMode.Open, FileAccess.Read, FileShare.Read);
TiffBitmapDecoder tiffdec = new TiffBitmapDecoder(tiff, BitmapCreateOptions.DelayCreation, BitmapCacheOption.Default);
返回tiffdec.Frames [0]; //返回tiffdec.Frames [0] .Thumbnail;
//GdPictureImaging obj = new GdPictureImaging();
//int m_CurrentImage = obj.CreateGdPictureImageFromFile(value.ToString());
//int thumnail= obj.CreateThumbnail(m_CurrentImage, 96, 96);
//TiffBitmapEncoder encoder = new TiffBitmapEncoder();
//MemoryStream memoryStream = new MemoryStream();
//BitmapImage bImg = new BitmapImage();
//encoder.Frames.Add(BitmapFrame.Create(tiffibitmapsource));
//encoder.Save(memoryStream);
//bImg.BeginInit();
//bImg.DecodePixelWidth = 100;
//bImg.CacheOption = BitmapCacheOption.OnLoad;
//bImg.StreamSource = new MemoryStream(memoryStream.ToArray());
//bImg.EndInit();
//memoryStream.Close();
//return bImg;
}
else
{
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.DecodePixelWidth = 100;
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.UriSource = new Uri(value.ToString());
bi.EndInit();
return bi;
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
如何将Bitmapsource转换为BitmapImage，然后解码像素！ TIFF没有缩略图，有没有办法创建和存储，然后只显示缩略图
更新2
根据MSDN
TIF是否可以像JPEG一样工作，而无需转换只是为了加载......
JPEG和便携式网络图形（PNG）编解码器本机解码 图像到指定的大小;其他编解码器解码图像 原始尺寸并将图像缩放到所需的大小。