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我使用圖像縮略圖查看器創建圖像編輯軟件。我有一個功能是旋轉圖像，用戶選擇一張照片，然後單擊按鈕。問題是我不想刷新所有ListBox。所以這個代碼：WPF ListBox項目位圖圖像更新
ImageListbox.Items.Refresh(); //Very slow if i have more than 100 imgs.
我只想爲BitmapImage一個INotifyPropertyChanged。
XAML：
<ListBox Grid.Row="0" x:Name="ImageListbox" VirtualizingPanel.IsVirtualizing="true"
VirtualizingPanel.VirtualizationMode="Recycling" SelectionChanged="ImageListbox_SelectionChanged" MouseDoubleClick="ImageListbox_MouseDoubleClick"
ItemsSource="{Binding Path=Model}"
Background="AliceBlue" ScrollViewer.HorizontalScrollBarVisibility="Disabled" Margin="0,0,2,0" Grid.RowSpan="2">
<ListBox.ContextMenu>
<ContextMenu x:Name="MenuContext">
<MenuItem Header="Abrir imagem (Prova)" Click="MenuItem_Click"/>
<MenuItem Header="Abrir imagem (Original)" Click="MenuItemOriginal_Click"/>
</ContextMenu>
</ListBox.ContextMenu>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="stack1" Height="330" Width="285" Margin="2,2,2,2" >
<WrapPanel>
<TextBlock Text="{Binding Path=ImgName}" Margin="5,0,0,0" FontSize="16" ></TextBlock>
<CheckBox Height="20" x:Name="chkUniqueId" IsChecked="{Binding Path=CheckBox}" Margin="5,0,0,0" Click="chkUniqueId_Click"/>
</WrapPanel>
<Image Margin="5,5,5,5" Height="300" Width="280" VerticalAlignment="Top" >
<Image.Source>
<BitmapImage x:Name="ImageSource" DecodePixelWidth="300" CacheOption="None" UriSource="{Binding Path=ImgPath}" />
</Image.Source>
</Image>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
C＃
public class ReportagemItems : ObservableCollection<ReportagemItem>
{
public ReportagemItems() { }
}
public class ReportagemItem : INotifyPropertyChanged
{
//i have more 2 properties here, not necessary for this example.
private string _ImgName;
public string ImgName
{
get { return this._ImgName; }
set
{
if (this._ImgName != value)
{
this._ImgName = value;
this.NotifyPropertyChanged("ImgName");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
//in Btn Click event i have:
List<ReportagemItem> changeItem = ImageListbox.Items.OfType<ReportagemItem>().Where(x => x.CheckBox).ToList();
foreach (var item in Model.Where(x => x.ImgPath == changeItem.First().ImgPath))
{
item.CheckBox = false; //WORKS
item.ImgName = "New Name"; //WORKS
item.ImgPath = @"C:\Programa Provas\Destino\Performance15\Uteis\Thumb\1.JPG"; //DOESNT WORK...
}
