WPF ObservableCollection未更新视图
本文关键字：新视图 更新 ObservableCollection WPF | 更新日期: 2023-09-27 18:23:48
这是xaml部分
<ItemsControl x:Name="EventsTop">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,1,0,0">
<Button Content="{Binding Name}" Template="{DynamicResource ButtonFirst}" Height="50" Margin="15,0,0,0" Padding="10,0,15,0" FontSize="19" FontFamily="/Resources/Fonts/Font Awesome/#FontAwesome" BorderThickness="5,0,0,0" BorderBrush="#8CC152" Background="#2980B9" HorizontalContentAlignment="Left" Foreground="Black" Click="TabOpen" Tag="{Binding Id}"></Button>
<StackPanel Background="#2980B9" Margin="15,0,0,5" Visibility="Collapsed" AllowDrop="True" Tag="{Binding Id}" Drop="RowDrop">
<Border BorderThickness="5,0,0,0" BorderBrush="#8CC152">
<StackPanel>
<DockPanel LastChildFill="False">
<Label DockPanel.Dock="Left" Width="140" Content="Date" FontSize="19" BorderThickness="0,0,0,1" FontFamily="/Resources/Fonts/Open Sans/#Open Sans" BorderBrush="Black" HorizontalContentAlignment="Center"></Label>
<Label DockPanel.Dock="Left" Width="190" Content="Event" FontSize="19" BorderThickness="0,0,0,1" FontFamily="/Resources/Fonts/Open Sans/#Open Sans" BorderBrush="Black" HorizontalContentAlignment="Center"></Label>
<Label DockPanel.Dock="Left" Width="100" Content="Select" FontSize="19" BorderThickness="0,0,0,1" FontFamily="/Resources/Fonts/Open Sans/#Open Sans" BorderBrush="Black" HorizontalContentAlignment="Center"></Label>
</DockPanel>
<ScrollViewer VerticalScrollBarVisibility="Auto" MaxHeight="150">
<ItemsControl ItemsSource="{Binding Details}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<DockPanel LastChildFill="False">
<Label Content="{Binding Date}" DockPanel.Dock="Left" Width="140" FontSize="19" BorderThickness="0" FontFamily="/Resources/Fonts/Open Sans/#Open Sans" BorderBrush="Black" HorizontalContentAlignment="Center"></Label>
<Label Content="{Binding EventName}" DockPanel.Dock="Left" Width="165" FontSize="19" BorderThickness="0" FontFamily="/Resources/Fonts/Open Sans/#Open Sans" BorderBrush="Black" HorizontalContentAlignment="Center"></Label>
<Border Width="97">
<CheckBox VerticalAlignment="Center" HorizontalAlignment="Center" IsChecked="{Binding Checked}"></CheckBox>
</Border>
<Button Width="25" DockPanel.Dock="Left" Content="" BorderThickness="0" Background="Transparent" FontFamily="/Resources/Fonts/Font Awesome/#FontAwesome"></Button>
</DockPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</StackPanel>
</Border>
</StackPanel>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
这是xaml.cs
private void WindowLoaded(object sender, RoutedEventArgs e)
{
EventHelper eventHelper = new EventHelper();
TopEvents = eventHelper.GetSports(EventHelper.EventGroup.Top);
foreach (Sport item in TopEvents)
{
item.Name = "'uf196 " + item.Name;
}
EventsTop.ItemsSource = TopEvents;
AllEvents = eventHelper.GetSports(EventHelper.EventGroup.All);
foreach (Sport item in AllEvents)
{
item.Name = "'uf196 " + item.Name;
}
EventsAll.ItemsSource = AllEvents;
Sport.ItemsSource = eventHelper.GetSports(EventHelper.EventGroup.All);
}
private void RowMouseDown(object sender, MouseButtonEventArgs e)
{
DockPanel currentRow = (DockPanel) sender;
int rowOffset = Convert.ToInt32(currentRow.Tag);
DragDrop.DoDragDrop(currentRow,rowOffset,DragDropEffects.Copy);
}
private void RowDrop(object sender, DragEventArgs e)
{
int rowOffset = (int) e.Data.GetData(typeof (int));
AllEvents[0].Name = "1";
}
还有我的模型在收集
class Sport : INotifyPropertyChanged
{
private int _id;
private string _name = string.Empty;
private ObservableCollection<Details> _details = new ObservableCollection<Details>();
public int Id
{
get { return _id; }
set { _id = value; }
}
public string Name
{
get { return _name; }
set
{
_name = value;
NotifyPropertyChanged("Content");
}
}
public ObservableCollection<Details> Details
{
get { return _details; }
set { _details = value; }
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
MessageBox.Show(info);
}
}
}
因此，当我更改属性时，它会抛出MessageBox，但不会更新GUI。
我xaml.cs我正在调用方法GetEventsreturn ObservableCollection
我想在ObservableCollaction<Sport> AllEvents 中的Sport中更改Name
您可以在xaml.cs中的RowDrop方法中看到它在调试中，我注意到AllEvents[0].Name已更改，但视图没有更新
更新
ObservabelCollection声明的一部分
public MainPage()
{
InitializeComponent();
AllEvents = new ObservableCollection<Sport>();
TopEvents = new ObservableCollection<Sport>();
EventsTop.ItemsSource = TopEvents;
EventsAll.ItemsSource = AllEvents;
}
private ObservableCollection<Sport> AllEvents;
private ObservableCollection<Sport> TopEvents;
第二次更新我发现，当我使用窗口激活事件时，它正在工作
我找到了解决方案。
所以，ObservableCollection运行得很好，但是，它需要刷新为了出现在视野中，我们需要使用
CollectionViewSource.GetDefaultView(ObservableCollection).Refresh()it 方法
我认为它会帮助
名为的属性的问题传递给NotifyPropertyChanged方法。参数的名称应为属性名称。请将Name属性更改为
public string Name
{
get { return _name; }
set
{
_name = value;
NotifyPropertyChanged("Name");
}
}
使用CallerMemberNameAttribute来避免必须获得正确的名称并允许重构：
private void NotifyPropertyChanged([CallerMemberName] string info = null)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
MessageBox.Show(info);
}
}
public string Name
{
get { return _name; }
set
{
_name = value;
NotifyPropertyChanged(); //now no need to specify
}
}
每个属性设置器都应该通知属性更改，因此：
public IEnumerable<Details> Details //note IEnumerable, no calling code needs to know its concrete type
{
get { return _details; }
set
{
_details = value;
NotifyPropertyChanged();
}
}
有了可观测范围集合，你就可以做到这一点：
private readonly ObservableRangeCollection<Details> _details = new ObservableRangeCollection<Details>();
public IEnumerable<Details> Details
{
get { return _details; }
set { _details.Replace(value); }
}
来自MSDN。
在添加、删除、更改、移动项或整个项时发生列表被刷新。
更改并不意味着何时更改子属性，而是指何时更改任何索引处的项。
因此，当您修改集合项时，您需要通知绑定该属性已更改。修改集合中的项目后，您将从窗口的视图模型中通知集合已更改。
NotifyPropertyChanged("AllEvents");