Memory 如何检查itemscontrol项是否在视口中_Memory_Optimization_Windows Phone 8_Viewport_Itemscontrol

Memory 如何检查itemscontrol项是否在视口中

memory optimization windows-phone-8

Memory 如何检查itemscontrol项是否在视口中,memory,optimization,windows-phone-8,viewport,itemscontrol,Memory,Optimization,Windows Phone 8,Viewport,Itemscontrol,我正在创建wp8应用程序，并通过itemscontrol控件来表示一个大数据集。问题是，由于元素的大小，我丢失了很多内存。如何检查itemscontrol项是否在视口中 <ItemsControl x:Name="showList" Margin="0" ItemsSource="{Binding tmp}"> <ItemsControl.ItemsPanel>

我正在创建wp8应用程序，并通过itemscontrol控件来表示一个大数据集。问题是，由于元素的大小，我丢失了很多内存。如何检查itemscontrol项是否在视口中

                        <ItemsControl x:Name="showList" Margin="0" ItemsSource="{Binding tmp}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <StackPanel Orientation="Vertical"></StackPanel>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal" Margin="0,2,0,0" Background="#FF2E2E2E" Width="280">
                                        <Image Source="../Images/edge_shadow_x8.png" HorizontalAlignment="Left" Stretch="Fill" Width="8" Margin="0,0,2,0"/>
                                        <TextBlock x:Name="time" FontSize="16" Text="{Binding StartTime}" Width="50" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="15,0" Foreground="White" TextWrapping="Wrap"/>
                                        <TextBlock x:Name="show" FontSize="16" Text="{Binding title}" Width="160" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="0,5,10,5" TextWrapping="Wrap"/>
                                    </StackPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </ScrollViewer>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>

以下是我使用的xaml：

                        <ItemsControl x:Name="showList" Margin="0" ItemsSource="{Binding tmp}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <StackPanel Orientation="Vertical"></StackPanel>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal" Margin="0,2,0,0" Background="#FF2E2E2E" Width="280">
                                        <Image Source="../Images/edge_shadow_x8.png" HorizontalAlignment="Left" Stretch="Fill" Width="8" Margin="0,0,2,0"/>
                                        <TextBlock x:Name="time" FontSize="16" Text="{Binding StartTime}" Width="50" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="15,0" Foreground="White" TextWrapping="Wrap"/>
                                        <TextBlock x:Name="show" FontSize="16" Text="{Binding title}" Width="160" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="0,5,10,5" TextWrapping="Wrap"/>
                                    </StackPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </ScrollViewer>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>

                        <ItemsControl x:Name="showList" Margin="0" ItemsSource="{Binding tmp}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <StackPanel Orientation="Vertical"></StackPanel>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal" Margin="0,2,0,0" Background="#FF2E2E2E" Width="280">
                                        <Image Source="../Images/edge_shadow_x8.png" HorizontalAlignment="Left" Stretch="Fill" Width="8" Margin="0,0,2,0"/>
                                        <TextBlock x:Name="time" FontSize="16" Text="{Binding StartTime}" Width="50" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="15,0" Foreground="White" TextWrapping="Wrap"/>
                                        <TextBlock x:Name="show" FontSize="16" Text="{Binding title}" Width="160" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="0,5,10,5" TextWrapping="Wrap"/>
                                    </StackPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </ScrollViewer>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>

您能使用LongListSelector控件吗？不幸的是，不能。我正在尝试实现某种ui虚拟化以减少内存消耗，这就是为什么我需要能够访问单个项目并检查其是否在视口中，以便可以操作该项目。谢谢你的评论