wpf 如何以编程方式使用 EventTrigger 和 InvokeCommandAction？
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How to use EventTrigger and InvokeCommandAction programmatically?
提问by Brandon Moore
I have a popup with a TextBoxthat the user should enter a ticket number into, and then when the user presses the enter key I want the ticket number to be passed to the ViewModel which will retrieve the ticket.
我有一个弹出窗口，TextBox用户应该在其中输入一个票号，然后当用户按下回车键时，我希望将票号传递给将检索票证的 ViewModel。
Here's the xaml for the TextBox:
这是用于的 xaml TextBox：
<TextBox x:Name="TicketNumber">
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyDown">
<i:InvokeCommandAction Command="{Binding OpenTicketCommand}"
CommandParameter="{Binding ElementName=TicketNumber,
Path=Text}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
The above works on any keypress, but I really only want it to happen when the enter key is pressed. How would I go about doing that?
以上适用于任何按键，但我真的只希望它在按下回车键时发生。我该怎么做呢？
EDIT:I am assuming it would have to be done programmatically (hence the title), but if not that's okay too.
编辑：我假设它必须以编程方式完成（因此标题），但如果不是，那也没关系。
回答by Adrian Faciu
You could use InputBindings - KeyBindingas alternative approach.
您可以将其InputBindings - KeyBinding用作替代方法。
Something like this:
像这样的东西：
<TextBox x:Name="TicketNumber">
<TextBox.InputBindings>
<KeyBinding Key="Enter"
Command="{Binding OpenTicketCommand}"
CommandParameter="{Binding ElementName=TicketNumber,
Path=Text}"/>
</TextBox.InputBindings>
</TextBox>
