求助：使用GridView遇到的一个内存泄漏的问题

Question

我想实现这个功能：当用户操作滚动条时，Gridview控件的当前选择项始终保持为出现在屏幕中的那一项。
//Scrollviewer的ViewChanged="GridView5_SV_ViewChanged_1"，处理如下：
void ReadPage::GridView5_SV_ViewChanged_1(Platform::Object^ sender, Windows::UI::Xaml::Controls::ScrollViewerViewChangedEventArgs^ e)
{
	
	int nVerticalOffset = GridView5_SV->VerticalOffset;
	int nHeight = GridView5_SV->ExtentHeight;
	int nPageHeight = nHeight/m_nPageCount;
	int nIndex = nVerticalOffset/nPageHeight;

	if (GridView5->SelectedIndex!=nIndex)
	{
		GridView5->SelectedIndex = nIndex;//这一句造成内存增加并会产生泄漏
	}
}

//Gridview的数据源是一个分组的数据集合
<CollectionViewSource x:Name="cvs2"
                              Source="{Binding Groups}"
                              IsSourceGrouped="True" 
                              ItemsPath="Items"
                              d:Source="{Binding ItemGroups, Source={d:DesignInstance Type=data:DataGroup, IsDesignTimeCreatable=True}}"/>

//控件信息
 <ScrollViewer x:Name="GridView5_SV"
            HorizontalScrollBarVisibility="Auto"
            VerticalScrollBarVisibility="Auto"
            Visibility="Visible"
                      ViewChanged="GridView5_SV_ViewChanged_1"
                      PointerWheelChanged="GridView5_SV_PointerWheelChanged_1">
            <GridView x:Name="GridView5" 
                      VerticalAlignment="Center" 
                      HorizontalAlignment="Center" 
                      SelectionMode="Single"
                      PointerWheelChanged="GridView5_PointerWheelChanged_1"
                      Visibility="Visible" 
                      IsSynchronizedWithCurrentItem="{x:Null}"
                      ItemsSource="{Binding Source={StaticResource cvs2}}" 
                      
                      ItemTemplate="{StaticResource DataTemplate1}">
            </GridView>
        </ScrollViewer>

//数据模板
 <DataTemplate x:Key="DataTemplate1">
        	<UserControl>        		
        		<Grid Background="White">
                    <Image Source="{Binding wbmp}" Width="{Binding PageWidth}" Height="{Binding PageHeight}"/>                               
        		</Grid>
        	</UserControl>
        </DataTemplate>

我已测试当wbmp的值为空时，内存泄漏现象也是存在的。
请问我哪里出错了呢？谢谢！

Answer 1

请问你的 wbmp 是一个什么类型的对象？ 是否为  BitmapImage ，请设置其  BitmapCreateOptions 属性为 IgnoreImageCache 然后再测试一下。

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Bob Bao [MSFT]
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