内存不足异常在Windows Phone 8上使用LongListSelector时

问题描述

大家好

我正在使用LongListSelector向用户显示歌曲（它们位于服务器上）。

下面是用于LongListSelector的 ItemTemplate

< DataTemplate x：Key =" AppTopItemsTemplate"> 
< Grid Margin =" 10"> 
< Grid.RowDefinitions> 
< RowDefinition Height =" *" /> 
< RowDefinition Height =" 50" /> 
< /Grid.RowDefinitions> 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =" *">< / ColumnDefinition> 
< /Grid.ColumnDefinitions> 
 
< Image Name =" itemImage" Grid.Row = QUOT; 0" Grid.Column = QUOT; 0" Grid.RowSpan = QUOT; 2英寸伸展= QUOT; UniformToFill" 
> 
< Image.Source> 
< BitmapImage UriSource =" {Binding ImageUrl}" 
 CreateOptions =" BackgroundCreation" /> 
< /Image.Source> 
< / Image> 
< StackPanel Grid.Row =" 1" Grid.Column = QUOT; 0"取向= QUOT;垂直"背景= QUOT;＃99000000" > 
 
< TextBlock Name =" itemTitle" Style =" {StaticResource AppItemTitleSubtitle}" 
 Text =" {Binding Title}" 
>< / TextBlock> 
< TextBlock Name =" itemSubTitle" Style =" {StaticResource AppItemTitleSubtitle}" 
 Text =" {Binding SubTitle}"填充= QUOT; 0,0,0,5" >< / TextBlock的> 
< / StackPanel> 
< / Grid> 
< / DataTemplate> 

ImageUrl 是图像控制的远程图像网址。

我实现了LongListSelector，下面是无限滚动代码。

 private void List_ItemRealized_1（object sender，ItemRealizationEventArgs e）
 {
 if（songList.ItemsSource as ObservableCollection< SongTable> == null）
 {
 return; 
} 
 int indexofRealizeditem = songsDataSource.Items.IndexOf（sngItem）; 
 if（！songsDataSource.IsLoading&&（e.Container.Content as SongTable）！= null&& e.ItemKind == LongListSelectorItemKind.Item&&（indexofRealizeditem == currentCount  -  1） ）
 {
 //一旦实现最后一项我将从server.loadmore加载更多项目是异步调用它不会阻止ui线程。 
 songsDataSource.loadMore（）; 
} 
} 

一切正常，但是当LongListSelector中加载超过 1000个项目时，它会抛出Out of Memory Exception。

由于我正在从服务器加载图片，这可能是原因但我如何为项目发布
内存这是由LongListSelector未实现的。

当项目未实现时，我将图像控制的源设置为null但它没有帮助。

任何人都可以建议我如何 我可以解决这个问题。

为了您在我的服务器上的信息，我有大约10000项。

解决方案

Hi All

I am using LongListSelector to show songs(they are located on server) to the user.

Below is the ItemTemplate used for LongListSelector

<DataTemplate x:Key="AppTopItemsTemplate">
                <Grid Margin="10">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                        <RowDefinition Height="50"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions >
                        <ColumnDefinition Width="*"></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    
                    <Image  Name="itemImage" Grid.Row="0" Grid.Column="0" Grid.RowSpan="2" Stretch="UniformToFill"
                                   >
                        <Image.Source>
                            <BitmapImage UriSource="{Binding ImageUrl}"
                                     CreateOptions="BackgroundCreation"/>
                        </Image.Source>
                    </Image>
                    <StackPanel Grid.Row="1" Grid.Column="0" Orientation="Vertical" Background="#99000000"  >

                        <TextBlock Name="itemTitle" Style="{StaticResource AppItemTitleSubtitle}"
                                    Text="{Binding Title}"
                                  ></TextBlock>
                        <TextBlock Name="itemSubTitle"  Style="{StaticResource AppItemTitleSubtitle}"
                                    Text="{Binding SubTitle}" Padding="0,0,0,5" ></TextBlock>
                    </StackPanel>
                </Grid>
            </DataTemplate>

ImageUrl is the Remote Image Url for the Image Control.

I had implemented LongListSelector with infinite scrolling below is the code.

private void List_ItemRealized_1(object sender, ItemRealizationEventArgs e)
        {
            if (songList.ItemsSource as ObservableCollection<SongTable> == null)
            {
                return;
            }
            int indexofRealizeditem = songsDataSource.Items.IndexOf(sngItem);
            if (!songsDataSource.IsLoading && (e.Container.Content as SongTable) != null && e.ItemKind == LongListSelectorItemKind.Item && (indexofRealizeditem == currentCount - 1))
            { 
                // as soon as last item is realized I am loading more items from server.loadmore is async call it is not blocking ui thread.
                songsDataSource.loadMore();
            }
        }

Everything works fine for me But when more than 1000 items are loaded in LongListSelector It throws Out of Memory Exception.

Since I am Loading images from server this might be the cause but How will I release theMemory for items which are unrealized by LongListSelector.

When Items are unrealized I am setting source of Image Control to null but its not helping.

Can any one suggest me How  I can resolve this issue.

For you information on my server I am having around 10000 items.

解决方案

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