将 KeyUp 作为参数传递 WPF 命令绑定文本框
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Pass KeyUp as parameter WPF Command Binding Text Box
提问by DermFrench
I've a Text box KeyUp Event Trigger Wired up to a command in WPF. I need to pass the actual key that was pressed as a command parameter.
我有一个文本框 KeyUp 事件触发器连接到 WPF 中的命令。我需要传递作为命令参数按下的实际键。
The command executes fine, but the code that handles it needs to know the actual key that was pressed (remember this could be an enter key or anything not just a letter, so I can't get it from the TextBox.text).
该命令执行良好，但处理它的代码需要知道按下的实际键（请记住，这可能是一个输入键或任何不只是一个字母的键，所以我无法从 TextBox.text 中获取它）。
Can't figure out how to do this. XAML:
无法弄清楚如何做到这一点。XAML：
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
XAML:
XAML：
<TextBox Height="23" Name="TextBoxSelectionSearch" Width="148" Tag="Enter Selection Name" Text="{Binding Path=SelectionEditorFilter.SelectionNameFilter,UpdateSourceTrigger=PropertyChanged}" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyUp">
<i:InvokeCommandAction Command="{Binding SelectionEditorSelectionNameFilterKeyUpCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
回答by dmusial
I don't think that's possible with InvokeCommandAction but you can quickly create your own Behaviorwhich could roughly look like this one:
我认为 InvokeCommandAction 不可能实现，但您可以快速创建自己的Behavior，大致如下所示：
public class KeyUpWithArgsBehavior : Behavior<UIElement>
{
public ICommand KeyUpCommand
{
get { return (ICommand)GetValue(KeyUpCommandProperty); }
set { SetValue(KeyUpCommandProperty, value); }
}
public static readonly DependencyProperty KeyUpCommandProperty =
DependencyProperty.Register("KeyUpCommand", typeof(ICommand), typeof(KeyUpWithArgsBehavior), new UIPropertyMetadata(null));
protected override void OnAttached()
{
AssociatedObject.KeyUp += new KeyEventHandler(AssociatedObjectKeyUp);
base.OnAttached();
}
protected override void OnDetaching()
{
AssociatedObject.KeyUp -= new KeyEventHandler(AssociatedObjectKeyUp);
base.OnDetaching();
}
private void AssociatedObjectKeyUp(object sender, KeyEventArgs e)
{
if (KeyUpCommand != null)
{
KeyUpCommand.Execute(e.Key);
}
}
}
and then just attach it to the TextBox:
然后将其附加到TextBox：
<TextBox Height="23" Name="TextBoxSelectionSearch" Width="148" Tag="Enter Selection Name" Text="{Binding Path=SelectionEditorFilter.SelectionNameFilter,UpdateSourceTrigger=PropertyChanged}" >
<i:Interaction.Behaviors>
<someNamespace:KeyUpWithArgsBehavior
KeyUpCommand="{Binding SelectionEditorSelectionNameFilterKeyUpCommand}" />
</i:Interaction.Behaviors>
</TextBox>
With just that you should receive the Keyas a parameter to the command.
仅此而已，您应该将 接收Key为命令的参数。
