C# 除非主窗口处于活动状态，否则不会显示背景图像
我有一个讨厌的错误，我似乎无法弄明白，它是驾驶我疯狂。我有一个窗口，其中有一个列表框，当选择一个项目时，会使用mvvm灯打开一个新窗口，显示不同的详细信息，问题是当我单击列表框（BrowseGamesView）中的项目时，打开的新窗口（GameDetailsView）不会显示背景图像，除非我单击返回BrowseGamesView。我正在调用一个api并使用一个转换器来构建图像的url。我需要新窗口打开时显示的图像C# 除非主窗口处于活动状态，否则不会显示背景图像,c#,wpf,mvvm,mvvm-light,C#,Wpf,Mvvm,Mvvm Light,我有一个讨厌的错误，我似乎无法弄明白，它是驾驶我疯狂。我有一个窗口，其中有一个列表框，当选择一个项目时，会使用mvvm灯打开一个新窗口，显示不同的详细信息，问题是当我单击列表框（BrowseGamesView）中的项目时，打开的新窗口（GameDetailsView）不会显示背景图像，除非我单击返回BrowseGamesView。我正在调用一个api并使用一个转换器来构建图像的url。我需要新窗口打开时显示的图像 <Window.Resources> <vm:GameD
<Window.Resources>
<vm:GameDetailsViewModel x:Key="vm"/>
<converters:StringToBackgroundImageConverter x:Key="stringToBackgroundImageConverter"/>
<converters:StringToImageConverter x:Key="stringToImageConverter"/>
</Window.Resources>
<Grid DataContext="{StaticResource vm}">
<Grid.Background>
<ImageBrush ImageSource="{Binding Game.ScreenshotBackground, Converter={StaticResource stringToBackgroundImageConverter}}"/>
</Grid.Background>
</Grid>
<Window.Resources>
<vm:GameDetailsViewModel x:Key="vm"/>
<converters:StringToBackgroundImageConverter x:Key="stringToBackgroundImageConverter"/>
<converters:StringToImageConverter x:Key="stringToImageConverter"/>
</Window.Resources>
<Grid DataContext="{StaticResource vm}">
<Grid.Background>
<ImageBrush ImageSource="{Binding Game.ScreenshotBackground, Converter={StaticResource stringToBackgroundImageConverter}}"/>
</Grid.Background>
</Grid>
<ListBox ItemsSource="{Binding Games}"
ItemContainerStyle="{DynamicResource ListBoxItemStyle1}"
SelectedItem="{Binding SelectedGame}"
Width="480"
Height="500"
Grid.Row="4">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Image Source="{Binding cover.image_id, Converter={StaticResource stringToImage}}"
Stretch="Fill"
Width="100"
Height="130"/>
<Grid Grid.Column="1">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="310"/>
<ColumnDefinition Width="30"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding name}"
Foreground="White"
FontWeight="Bold"
FontSize="16"
Margin="15 2 0 0"
TextWrapping="Wrap"/>
<TextBlock Text="{Binding aggregated_rating, StringFormat={}{0:F0}, Converter={StaticResource nullRatingConverter}}"
Grid.Column="1"
Foreground="{Binding AggregatedRatingColor}"
FontWeight="Bold"
FontSize="16"
HorizontalAlignment="Center"/>
</Grid>
<ItemsControl Grid.Row="1"
ItemsSource="{Binding DeveloperCompanies}"
Margin="15 2 0 0">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock x:Name="commaTextBlock"
Text=", "
Foreground="White"/>
<TextBlock Text="{Binding company.name}"
Foreground="White"
TextWrapping="Wrap"/>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
<Setter Property="Visibility" TargetName="commaTextBlock" Value="Collapsed"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<Grid Grid.Row="2"
VerticalAlignment="Bottom"
Margin="0 0 0 4">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Text="Release Date:"
Foreground="White"
Margin="15 20 0 0"/>
<TextBlock Text="{Binding first_release_date, Converter={StaticResource unixTimestampToDateTimeConverter}}"
Foreground="White"
Margin="10 20 0 0"
Grid.Column="1"/>
</Grid>
</Grid>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
public class GameDetailsViewModel : INotifyPropertyChanged
{
private Game game;
public Game Game
{
get { return game; }
set
{
game = value;
OnPropertyChanged("Game");
}
}
public GameDetailsViewModel()
{
Messenger.Default.Register<Game>(this, NotifyMe);
}
public void NotifyMe(Game sentGame)
{
Game = sentGame;
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class BrowseGamesViewModel : ViewModelBase, INotifyPropertyChanged
{
private string query;
private Game selectedGame;
private int gamesCount;
private Game game;
public RelayCommand ShowGameDetailsViewCommand { private set; get; }
public string Query
{
get { return query; }
set
{
query = value;
OnPropertyChanged("Query");
}
}
public Game Game
{
get { return game; }
set
{
game = value;
OnPropertyChanged("Game");
}
}
public Game SelectedGame
{
get { return selectedGame; }
set
{
selectedGame = value;
OnPropertyChanged("SelectedGame");
GetGameDetails();
ShowGameDetailsViewCommandExecute();
}
}
public ObservableCollection<Game> Games { get; set; }
public int GamesCount
{
get { return gamesCount; }
set
{
gamesCount = value;
OnPropertyChanged("GamesCount");
}
}
public SearchGamesCommand SearchGamesCommand { get; set; }
public BrowseGamesViewModel()
{
Games = new ObservableCollection<Game>();
SearchGamesCommand = new SearchGamesCommand(this);
ShowGameDetailsViewCommand = new RelayCommand(ShowGameDetailsViewCommandExecute);
}
public void ShowGameDetailsViewCommandExecute()
{
Messenger.Default.Send(new NotificationMessage("ShowGameDetailsView"));
}
private async void GetGameDetails()
{
Game = await IGDBHelper.GetGameInformation(SelectedGame.id);
Messenger.Default.Send(Game);
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
公共类GameDetailsViewModel:INotifyPropertyChanged
{
私人游戏；
公共游戏
{
获取{返回游戏；}
设置
{
游戏=价值；
OnPropertyChanged（“游戏”）；
}
}
公共游戏详细信息viewmodel（）
{
Messenger.Default.Register（这个，NotifyMe）；
}
公共无效通知我（游戏sentGame）
{
游戏=游戏；
}
公共事件属性更改事件处理程序属性更改；
受保护的无效OnPropertyChanged（字符串propertyName）
{
PropertyChanged？.Invoke（这是新的PropertyChangedEventArgs（propertyName））；
}
}
public class GameDetailsViewModel : INotifyPropertyChanged
{
private Game game;
public Game Game
{
get { return game; }
set
{
game = value;
OnPropertyChanged("Game");
}
}
public GameDetailsViewModel()
{
Messenger.Default.Register<Game>(this, NotifyMe);
}
public void NotifyMe(Game sentGame)
{
Game = sentGame;
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class BrowseGamesViewModel : ViewModelBase, INotifyPropertyChanged
{
private string query;
private Game selectedGame;
private int gamesCount;
private Game game;
public RelayCommand ShowGameDetailsViewCommand { private set; get; }
public string Query
{
get { return query; }
set
{
query = value;
OnPropertyChanged("Query");
}
}
public Game Game
{
get { return game; }
set
{
game = value;
OnPropertyChanged("Game");
}
}
public Game SelectedGame
{
get { return selectedGame; }
set
{
selectedGame = value;
OnPropertyChanged("SelectedGame");
GetGameDetails();
ShowGameDetailsViewCommandExecute();
}
}
public ObservableCollection<Game> Games { get; set; }
public int GamesCount
{
get { return gamesCount; }
set
{
gamesCount = value;
OnPropertyChanged("GamesCount");
}
}
public SearchGamesCommand SearchGamesCommand { get; set; }
public BrowseGamesViewModel()
{
Games = new ObservableCollection<Game>();
SearchGamesCommand = new SearchGamesCommand(this);
ShowGameDetailsViewCommand = new RelayCommand(ShowGameDetailsViewCommandExecute);
}
public void ShowGameDetailsViewCommandExecute()
{
Messenger.Default.Send(new NotificationMessage("ShowGameDetailsView"));
}
private async void GetGameDetails()
{
Game = await IGDBHelper.GetGameInformation(SelectedGame.id);
Messenger.Default.Send(Game);
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
公共类BrowseGamesViewModel:ViewModelBase，INotifyPropertyChanged
{
私有字符串查询；
私人游戏选择游戏；
私人游戏公司；
私人游戏；
public RelayCommand ShowGameDetailsViewCommand{private set；get；}
公共字符串查询
{
获取{return query；}
设置
{
查询=值；
OnPropertyChanged（“查询”）；
}
}
公共游戏
{
获取{返回游戏；}
设置
{
游戏=价值；
OnPropertyChanged（“游戏”）；
}
}
公共游戏选择名称
{
获取{return selectedGame；}
设置
{
selectedGame=值；
OnPropertyChanged（“SelectedName”）；
GetGameDetails（）；
ShowGameDetailsViewCommandExecute（）；
}
}
公共可观测集合游戏{get；set；}
公共游戏中心
{
获取{return gamesCount；}
设置
{
gamesCount=价值；
OnPropertyChanged（“GamesCount”）；
}
}
公共搜索游戏命令和搜索游戏命令{get；set；}
公共浏览器gamesviewmodel（）
{
Games=新的可观测集合（）；
SearchGamesCommand=新的SearchGamesCommand（此）；
ShowGameDetailsViewCommand=新的RelayCommand（ShowGameDetailsViewCommandExecute）；
}
public void ShowGameDetailsViewCommandExecute（）
{
senger.Default.Send（新通知消息（“ShowGameDetailsView”）；
}
私有异步void GetGameDetails（）
{
Game=wait IGDBHelper.GetGameInformation（SelectedGame.id）；
Messenger.Default.Send（游戏）；
}
公共事件属性更改事件处理程序属性更改；
受保护的无效OnPropertyChanged（字符串propertyName）
{
PropertyChanged？.Invoke（这是新的PropertyChangedEventArgs（propertyName））；
}
}
public partial class BrowseGamesView : Window
{
public BrowseGamesView()
{
InitializeComponent();
Messenger.Default.Register<NotificationMessage>(this, NotificationMessageReceived);
}
private void NotificationMessageReceived(NotificationMessage msg)
{
if (msg.Notification == "ShowGameDetailsView")
{
var view = new GameDetailsView();
view.Show();
}
}
}
public分部类BrowseGamesView:窗口
{
公共浏览器gamesview（）
{
初始化组件（）；
Messenger.Default.Register（此为NotificationMessageReceived）；
}
收到私有无效NotificationMessage（NotificationMessage消息）
{
如果（msg.Notification==“ShowGameDetailsView”）
{
var view=newgamedetailsview（）；
view.Show（）；
}
}
}