每当我单击列表视图中的任何图像时，详细视图中的图像首先显示先前加载的图像，然后刷新并从当前选择中加载图像。
我认为问题在于您的 Mater/Detail 结构是如何实现的。从你的代码我可以看到你可能从文件中读取图像并设置BitmapImage为源Image，ListView这里我创建了一个示例，当窗口的宽度超过 720 时，详细信息将显示在 Master 的右侧，如果宽度小于 720，细节将被放大（全屏）。
我的主页：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="AdaptiveStates">
<VisualState x:Name="DefaultState">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="720" />
</VisualState.StateTriggers>
</VisualState>
<VisualState x:Name="NarrowState">
<VisualState.StateTriggers>
<AdaptiveTrigger MinWindowWidth="0" />
</VisualState.StateTriggers>
<VisualState.Setters>
<Setter Target="MasterColumn.Width" Value="*" />
<Setter Target="DetailColumn.Width" Value="0" />
<Setter Target="MasterListView.SelectionMode" Value="None" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="MasterColumn" Width="320" />
<ColumnDefinition x:Name="DetailColumn" Width="*" />
</Grid.ColumnDefinitions>
<ListView x:Name="MasterListView" Grid.Column="0" ItemContainerTransitions="{x:Null}"
IsItemClickEnabled="True" ItemClick="MasterListView_ItemClick" ItemsSource="{x:Bind itemcollection}">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:TestItem">
<Image Source="{x:Bind ImageItem}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<ContentPresenter x:Name="DetailContentPresenter" Grid.Column="1" BorderThickness="1,0,0,0"
Padding="24,0" BorderBrush="{ThemeResource SystemControlForegroundBaseLowBrush}"
Content="{x:Bind MasterListView.SelectedItem, Mode=OneWay}">
<ContentPresenter.ContentTemplate>
<DataTemplate x:DataType="local:TestItem">
<Image Source="{x:Bind ImageItem}" />
</DataTemplate>
</ContentPresenter.ContentTemplate>
</ContentPresenter>
</Grid>
后面的代码：
private ObservableCollection<TestItem> itemcollection = new ObservableCollection<TestItem>();
public MainPage()
{
this.InitializeComponent();
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
StorageFolder picLib = KnownFolders.PicturesLibrary;
var picfiles = await picLib.GetFilesAsync();
foreach (var pic in picfiles)
{
BitmapImage bmp = new BitmapImage();
IRandomAccessStream stream = await pic.OpenReadAsync();
bmp.SetSource(stream);
itemcollection.Add(new TestItem { ImageItem = bmp });
}
}
private void MasterListView_ItemClick(object sender, ItemClickEventArgs e)
{
var clickedItem = (TestItem)e.ClickedItem;
if (AdaptiveStates.CurrentState == NarrowState)
{
Frame.Navigate(typeof(DetailPage), clickedItem);
}
}
我的详细信息页面：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Image Source="{x:Bind image}" />
</Grid>
后面的代码：
private BitmapImage image;
public DetailPage()
{
this.InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
var testitem = e.Parameter as TestItem;
image = testitem.ImageItem;
var backStack = Frame.BackStack;
var backStackCount = backStack.Count;
if (backStackCount > 0)
{
var masterPageEntry = backStack[backStackCount - 1];
backStack.RemoveAt(backStackCount - 1);
// Doctor the navigation parameter for the master page so it
// will show the correct item in the side-by-side view.
var modifiedEntry = new PageStackEntry(
masterPageEntry.SourcePageType,
e.Parameter,
masterPageEntry.NavigationTransitionInfo
);
backStack.Add(modifiedEntry);
}
// Register for hardware and software back request from the system
SystemNavigationManager systemNavigationManager = SystemNavigationManager.GetForCurrentView();
systemNavigationManager.BackRequested += DetailPage_BackRequested;
systemNavigationManager.AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
base.OnNavigatedFrom(e);
SystemNavigationManager systemNavigationManager = SystemNavigationManager.GetForCurrentView();
systemNavigationManager.BackRequested -= DetailPage_BackRequested;
systemNavigationManager.AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
}
private void OnBackRequested()
{
Frame.GoBack();
}
private void DetailPage_BackRequested(object sender, BackRequestedEventArgs e)
{
e.Handled = true;
OnBackRequested();
}
我的TestItem课在这里很简单：
public class TestItem
{
public BitmapImage ImageItem { get; set; }
}
您也可以参考官方的Master/detail 示例。我根据这个官方示例编写了我的示例，这里的关键点是：
创建并排的主/详细页面。
在主列表和详细视图之间导航。
调整应用程序大小时更改导航模型。
我已经在后台线程中运行 image_fetch，但我仍然看到从用户单击列表视图项到图像以详细视图加载的时间有一个小的延迟。
每次单击 ListViewItem 时是否都获取了图像源（例如从文件中），那么您可以将图像源设置为详细信息框架吗？在这里使用 DataBinding，当您想将数据添加到您的ListView.