[英]WPF: Datagrid is updating header after adding or removing item at binding collection
[英]Updating Listview after adding/removing item
将项目添加到Windows Store应用程序中的集合后,如何刷新ListView? 将项目添加到列表可以正常工作,但Listview不会刷新。 我正在尝试实现INotifyCollectionChanged ,但是究竟应该怎么做才能使其起作用?
编辑:XAML文件
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ListView HorizontalAlignment="Left" Height="437" Margin="10,120,0,0" VerticalAlignment="Top" Width="593" ItemsSource="{Binding Persons, Mode=TwoWay}" Background="#FF5D5D5D">
<ListView.DataContext>
<Model:School/>
</ListView.DataContext>
</ListView>
<Button Content="Button" HorizontalAlignment="Left" Margin="7,64,0,0" VerticalAlignment="Top" Command="{Binding AddCommand, Mode=OneWay}">
<Button.DataContext>
<Model:School/>
</Button.DataContext>
</Button>
</Grid>
C#代码:
class School
{
private ObservableCollection<string> _persons = new ObservableCollection<string>()
{
"Name1", "Name2", "Name3"
};
public ObservableCollection<string> Persons
{
get { return _persons; }
}
private ICommand _addCommand;
public ICommand AddCommand
{
get
{
return this._addCommand ??
(this._addCommand = new RelayCommand(Add));
}
}
private void Add()
{
this._persons.Add("Name");
}
}
使用ObservableCollection时不需要添加INotifyCollectionChanged-它已经实现了所需的接口。
您的代码应该可以运行,尽管可能还有其他问题:
检查是否正确设置了ListView的DataContext (在本例中为其父级)-应该对其进行设置,以便“ ListView可以找到” Persons属性,
还检查ItemTemplate是否设置正确-例如:
<ListView Name="myList" ItemsSource="{Binding Persons}"> <ListView.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Name}"/> <TextBlock Text="{Binding Surname}"/> </StackPanel> </DataTemplate> </ListView.ItemTemplate> </ListView>
在您的情况下,您的ListView的ItemsSource不需要使用TwoWay绑定-您不需要定义Persons属性的设置器。
编辑:
编辑之后,我可以看到问题出在哪里-您正在为ListView和Button设置单独的DataContext-按钮将添加到其自己的集合中-与ListView绑定到的集合不同。 进行简短测试-将两者的DataContext设置为相同的staticresource:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.Resources>
<Model:School x:Key="mySchool"/>
</Grid.Resources>
<ListView HorizontalAlignment="Left" VerticalAlignment="Stretch" Margin="10,120,0,0" ItemsSource="{Binding Persons}" Background="#FF5D5D5D"
DataContext="{StaticResource mySchool}"/>
<Button Content="Button" HorizontalAlignment="Left" Margin="7,64,0,0" VerticalAlignment="Top" Command="{Binding AddCommand, Mode=OneWay}"
DataContext="{StaticResource mySchool}">
</Button>
</Grid>
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