[英]How to display a listbox with the populated items on click of a menu item in XAML/C#
我的XAML文件中有一个上下文菜单。 当我单击此菜单项时,我想向用户显示一个列表框,其中包含从后端调用中填充的数据列表。 我该如何实现? 我是XAML / WPF的新手。
这将是您的xaml:
<Window x:Class="MyWpfApp.MyWindow"
xmlns:cmd="clr-namespace:MyWpfApp.MyCommandsNamespace"
xmlns:vm="clr-namespace:MyWpfApp.MyViewModelsNamespace"
...>
<Window.Resources>
<DataTemplate x:Key="MyItemTemplate" DataType="{x:Type vm:MyItemClass}">
<TextBlock Text="{Binding MyItemText}"/>
</DataTemplate>
</Window.Resources>
<Window.CommandBindings>
<CommandBinding Command="{x:Static cmd:MyCommandsClass.MyCommand1}" Executed="ExecuteMyCommand" CanExecute="CanExecuteMyCommand"/>
</Window.CommandBindings>
<Window.ContextMenu>
<ContextMenu>
<MenuItem Header="MyMenuItem1"
CommandTarget="{Binding}"
Command="{x:Static cmd:MyCommandsClass.MyCommand1}"/>
</ContextMenu>
</Window.ContextMenu>
<Grid>
<ItemsControl ItemsSource="{Binding MyList}"
ItemTemplate="{StaticResource MyItemTemplate}"/>
</Grid>
</Window>
这将是您的CS代码:
public MyWindow()
{
VM = new MyViewModelsNamespace.MyViewModel();
this.DataContext = VM;
InitializeComponent();
}
public void ExecuteMyCommand(object sender, ExecutedRoutedEventArgs e)
{
VM.MyList.Add(new MyItemClass{MyItemText="some text"});
}
public void CanExecuteMyCommand(object sender, CanExecuteRoutedEventArgs e)
{
if (...) e.CanExecute = false;
else e.CanExecute = true;
}
MyViewModel是这样的:
public class MyViewModel : DependencyObject
{
//MyList Observable Collection
private ObservableCollection<MyItemClass> _myList = new ObservableCollection<MyItemClass>();
public ObservableCollection<MyItemClass> MyList { get { return _myList; } }
}
和MyItemClass是这样的:
public class MyItemClass : DependencyObject
{
//MyItemText Dependency Property
public string MyItemText
{
get { return (string)GetValue(MyItemTextProperty); }
set { SetValue(MyItemTextProperty, value); }
}
public static readonly DependencyProperty MyItemTextProperty =
DependencyProperty.Register("MyItemText", typeof(string), typeof(MyItemClass), new UIPropertyMetadata("---"));
}
我忘了提到命令:
public static class MyCommandsClass
{
public static RoutedCommand MyCommand1 = new RoutedCommand();
}
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