Windows Phone中的内存不足异常

Question

我有一个列表框，我从媒体库加载一些图像。但是第二次加载或点击后退按钮时出现异常。这是我的代码............

 public MainPage()
{
InitializeComponent();
getImages();

}
public void getImages()
{
try
{
    MediaLibrary mediaLibrary = new MediaLibrary();
    var pictures = mediaLibrary.Pictures;
    foreach (var picture in pictures)
    {
        BitmapImage image = new BitmapImage();
        image.SetSource(picture.GetImage());//out of memory exception
        img mediaImage = new img();
        mediaImage.Imgs = image;
        imageList.Items.Add(mediaImage);
    }
}
catch (Exception ex)
{

}

}
public class img
{
public img()
{ }
public BitmapImage Imgs { get; set; }
}

在Xaml ......

<ScrollViewer Name="sc" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Hidden" Margin="0,422,0,43">
        <ListBox Name="imageList" SelectionChanged="imageList_SelectionChanged_1" Height="126">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate >
                    <StackPanel Orientation="Horizontal"></StackPanel>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate >
                    <StackPanel Orientation="Horizontal">
                    <Image Margin="10" Name="image1" Source="{Binding Imgs}" Height="150" Width="150"></Image>
                        </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </ScrollViewer>

在picture.getimage（）中的getimages（）方法中，它显示内存异常（我已经用代码编写）。我尝试过imageList.items.Clear（）。但是它没有用。

所以请帮忙......