在代码隐藏中找不到XAML控件（Control.Template.FindName） [英] XAML control not found in code-behind (Control.Template.FindName)

问题描述

所以我有这个UserControl：
$

So I have this UserControl:

<UserControl x:Class="DinerPOS.Restaurant.Windows.UserMenuInterface"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:customcontrols="clr-namespace:System.Windows.WPF.Controls;assembly=CustomControls"
             xmlns:resources="clr-namespace:DinerPOS.Properties"
             mc:Ignorable="d"
             d:DesignHeight="450" d:DesignWidth="800">
     <Image x:Name="MenuImage" Grid.Column="1" Grid.Row="1" Cursor="/DinerPOS;component/Resources/Cursors/Hand.cur"
            Source="/DinerPOS;component/Resources/Images/Restaurant/Beverages/Beverage.png" Stretch="Fill">
            <Image.ContextMenu>
                <ContextMenu x:Name="MenuImageContextMenu" Background="White" Cursor="/DinerPOS;component/Resources/Cursors/Hand.cur" Width="175" Height="100">
                    <ContextMenu.Template>
                        <ControlTemplate x:Name="MenuImageTemplate">
                            <Grid x:Name="ContextMenuGrid" Background="{TemplateBinding Background}">
                                <customcontrols:CustomMenuItem x:Name="BeverageMenuItem" />
                            </Grid>
                        </ControlTemplate>
                    </ContextMenu.Template>
                </ContextMenu>
            </Image.ContextMenu>
        </Image>
</UserControl>

我想要做的是访问代码隐藏中的BeverageMenuItem控件，但它永远找不到。

What I want to do is access the BeverageMenuItem control in the code-behind, but it's never found.

代码落后：

CustomMenuItem BeverageMenuItem = (CustomMenuItem)MenuImageContextMenu.Template.FindName("BeverageMenuItem", MenuImage);

如何访问此控件？

How do I access this control?

推荐答案

由于上下文菜单很可能无法打开，因此无法创建BeverageMenuItem，因此无法找到。 你到底想要完成什么？

Because the context menu is most likely not open BeverageMenuItem is not created so cannot be found.  What exactly are you trying to accomplish?

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