如何使用 MVVM 处理 WPF 列表框选择更改事件
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how to handle WPF listbox selectionchanged event using MVVM
提问by skumar
I am trying to perform listbox changed event in WPF using MVVM. Please let me know how to do this selectionchanged event.
我正在尝试使用 MVVM 在 WPF 中执行列表框更改事件。请让我知道如何执行此 selectionchanged 事件。
回答by Daniel Hilgarth
You would bind the SelectedItemproperty of the listbox to your property on the ViewModel:
您将SelectedItem列表框的属性绑定到您在 ViewModel 上的属性：
<ListBox SelectedItem="{Binding SelectedItem}" ...>
....
</ListBox>
In the property there always will be the selected item from the ListBox. If you really need to do something when the selection changes you can do it in the setter of that property:
在该属性中，总会有来自 ListBox 的选定项。如果您确实需要在选择更改时执行某些操作，则可以在该属性的 setter 中执行此操作：
public YourItem SelectedItem
{
get { return _selectedItem; }
set
{
if(value == _selectedItem)
return;
_selectedItem = value;
NotifyOfPropertyChange("SelectedItem");
// selection changed - do something special
}
}
回答by Muhammad Ummar
You can do it using
你可以使用
- Add reference to
System.Windows.Interactivityin your project - in XAML add
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
System.Windows.Interactivity在您的项目中添加引用- 在 XAML 中添加
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
Then
然后
<ListBox>
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding YourCommand}"
CommandParameter="{Binding YourCommandParameter}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</ListBox>
回答by ajd.nas
you can binding ListBox SelectionChanged Event to command in your ViewModel.
您可以将 ListBox SelectionChanged 事件绑定到 ViewModel 中的命令。
see this answer https://stackoverflow.com/a/18960028/5627499
