我在 MainPage.xaml 上使用了一个列表框。通过使用鼠标上下移动，我可以看到内容消失并显示在 Windows Phone 模拟器屏幕上。松开鼠标后，内容将从第一项开始。假设我想选择列表框中的最后一项。如何保留屏幕上的最后一项？希望你能帮助我或给我一个例子或一个想法来解决这个问题。提前致谢。
编辑：
有我的用户控制：
<UserControl x:Class="CMSPhoneApp.QueueListControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
d:DesignHeight="480" d:DesignWidth="480"
xmlns:local="clr-namespace:CMSPhoneApp" >
<UserControl.Resources>
<local:VisibilityConverter x:Key="VisibilityConverter"/>
<local:ColumSpanConverter x:Key="ColumSpanConverter"/>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox x:Name="lst" HorizontalAlignment="Left" Margin="6,6,0,0" VerticalAlignment="Top" Width="400"
ItemsSource="{Binding Path=MyQueue}"
SelectedItem="{Binding Path=CurrentQueue, Mode=TwoWay}" >
<ListBox.ItemTemplate>
<DataTemplate>
<Border BorderThickness="1,1,1,1" BorderBrush="Blue">
<Grid Width="auto" HorizontalAlignment="Stretch" >
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="35" />
<ColumnDefinition Width="250"/>
<ColumnDefinition Width="125" />
</Grid.ColumnDefinitions>
<Image Source="{Binding Type}" Grid.Row="0" Grid.Column="0"/>
<TextBlock Grid.Row="0" Grid.Column="1" Grid.ColumnSpan= "{Binding isSpan, Converter={StaticResource ColumSpanConverter}}" Text="{Binding summary}" TextWrapping="Wrap"
Style="{StaticResource PhoneTextAccentStyle}" />
<Button x:Name="btnAction" Grid.Row="0" Grid.Column="3" ClickMode="Press" Click="btnAction_Click" Style="{StaticResource ButtonStyle1}"
Visibility="{Binding isVisibility, Converter={StaticResource VisibilityConverter}}"
Tag="{Binding callNumber}">
<Button.Content>
<TextBlock Width="85" Height="70" Text="{Binding ActionCaption}"
Style="{StaticResource LabelStyle_20}" />
</Button.Content>
</Button>
</Grid>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Grid>
xaml 页面使用上述用户控件。
<phone:PhoneApplicationPage xmlns:my="clr-namespace:CMSPhoneApp"
x:Class="CMSPhoneApp.TestPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"
shell:SystemTray.IsVisible="True"
xmlns:local="clr-namespace:CMSPhoneApp"
xmlns:toolkit="clr- namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
>
<phone:PhoneApplicationPage.Resources>
<local:QueueItemViewModel x:Key="TestViewModel"/>
<DataTemplate x:Name="PickerItemTemplate">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding city}" FontSize="24" HorizontalAlignment="Center" VerticalAlignment="Center" />
</StackPanel>
</DataTemplate>
<DataTemplate x:Name="PickerFullModeItemTemplate">
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding city}" Margin="16 0 0 0" FontSize="24" FontFamily="{StaticResource PhoneFontFamilyLight}" />
</StackPanel>
</DataTemplate>
</phone:PhoneApplicationPage.Resources>
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent" DataContext="{StaticResource TestViewModel}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28" >
<TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="Test page" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<StackPanel x:Name="City" Grid.Row="1" Margin="12,0,12,0" Orientation="Horizontal">
<toolkit:ListPicker x:Name="listPicker" ItemTemplate="{StaticResource PickerItemTemplate}"
Header="Location" CacheMode="BitmapCache" Width="194"
SelectedItem="{Binding city}" />
</StackPanel>
<!--ContentPanel - place additional content here-->
<my:QueueListControl x:Name="lst" Grid.Row="2"/>
<StackPanel Grid.Row="3" Orientation="Horizontal" >
<Button x:Name="btnQueue" Style="{StaticResource ButtonStyle1}" Content="Queue"/>
<Button x:Name="btnRefresh" Style="{StaticResource ButtonStyle1}" Content="Refresh"/>
</StackPanel>
</Grid>
获取GetResponseStream后设置itemSource的代码：
Dispatcher.BeginInvoke(new Action(() => lst.lst.ItemsSource = ar.cmsQueue));