[UWP]问题：如何绑定到MenuFlyoutItem内的autoSuggestBox [英] [UWP]Question issue: How to bind to a autoSuggestBox inside a MenuFlyoutItem

问题描述

您好，

我正在使用MVVM模式将ViewPage中AutoSuggestBox的属性绑定到我的ViewModel。当我在Grid或stackPanel中时，这很好。

I am using the MVVM pattern to bind the properties of the AutoSuggestBox in a ViewPage to my ViewModel. This works fine when I am inside a Grid or a stackPanel.

但是一旦我将AutoSuggestBox放在Button的MenuFlyout中。我得到以下错误：

But once I put the AutoSuggestBox inside a MenuFlyout of a Button. I get the following Error:

错误 对象引用未设置为实例一个对象。

Error Object reference not set to an instance of an object.

< Button>

<Button>

< Button.Flyout>

<Button.Flyout>

< MenuFlyoutItem>
  &NBSP; &NBSP; < MenuFlyoutItem.Template>

<MenuFlyoutItem >
      <MenuFlyoutItem.Template>

&NBSP; < ControlTemplate TargetType =" MenuFlyoutItem">

  <ControlTemplate TargetType="MenuFlyoutItem">

< AutoSuggestBox Header ="你叫什么名字？"
TextChanged =" {x：Bind ViewModel.FilterUsuals}"
QuerySubmitted =" {x：Bind ViewModel.ProcessQuery}"
SuggestionChosen =" {x：Bind ViewModel.ProcessChoice}"
ItemsSource =" {Binding Elements}"
Text =" {x：Bind ViewModel.SearchText，Mode = TwoWay}" ;
QueryIcon =" Find" />

<AutoSuggestBox Header="What's your name?" TextChanged="{x:Bind ViewModel.FilterUsuals}" QuerySubmitted="{x:Bind ViewModel.ProcessQuery}" SuggestionChosen="{x:Bind ViewModel.ProcessChoice}" ItemsSource="{Binding Elements}" Text="{x:Bind ViewModel.SearchText, Mode=TwoWay}" QueryIcon="Find" />

 < / ControlTemplate>
  &NBSP; &NBSP; < /MenuFlyoutItem.Template>
< / MenuFlyoutItem>

 </ControlTemplate>
      </MenuFlyoutItem.Template>
</MenuFlyoutItem>

关于如何在MenuFlyoutItem中绑定AutoSuggestBox的属性的任何指导??

Any guidance on how to bind the properties of AutoSuggestBox inside the MenuFlyoutItem??

谢谢你们..

推荐答案

Hello LamCAP，

Hello LamCAP,

据我所知，你无法绑定一个事件到ControlTemplate中的事件处理程序。您可以使用

EventTrigger 得到它。

As far as I know, you could not bind an event to event handler in ControlTemplate. You could use EventTrigger to get it.

这是一个类似的线程
"为什么我不能在数据模板中使用{x：绑定{RelativeSource Self}}？"供您参考。

This is a similar thread "Why can't I use {x:Bind {RelativeSource Self}} in a data template?" for your reference.

最好的问候，

Xavier Eoro

Xavier Eoro

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