从ContentPresenter的DataTemplate后面的代码中访问一个命名的TextBox [英] Access a named TextBox in the code behind from a ContentPresenter's DataTemplate

问题描述

我试图通过WPF页面后面的代码访问名为 TextBox （textBoxAnswer）的内容。麻烦在于，因为它是 DataTemplate 的一部分，所以它不会作为类的私有成员自动生成，就像如果我不使用 ContentPresenter + DataTemplate 。 （我正在使用 DataTemplate ，因为我需要使用 DataTrigger s，下面的示例中未包含）。

I am trying to get access to a named TextBox (textBoxAnswer) in the code behind of my WPF Page. The trouble is, because it is part of a DataTemplate, it is not auto-generated as a private member of the class, like it would be if I wasn't using the ContentPresenter + DataTemplate. (I am using the DataTemplate because I need to use DataTriggers, not included in the example below).

我尝试调用 FindResource（ textBoxAnswer）和 FindName（ textBoxAnswer），但都不返回任何内容。

I have tried calling FindResource("textBoxAnswer") and FindName("textBoxAnswer"), but neither return anything.

有什么建议吗？这是我的XAML的精简版本：

Any suggestions? Here is a stripped down version of my XAML:

<Page x:Class="LearningGames.Numbers.NumbersPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ContentPresenter Content="{Binding}">
    <ContentPresenter.ContentTemplate>
        <DataTemplate>
            <Grid>
                <TextBox Margin="5" x:Name="textBoxAnswer"
                Text="{Binding Answer}" />
            </Grid>
        </DataTemplate>
    </ContentPresenter.ContentTemplate>
</ContentPresenter>

推荐答案

给 ContentPresenter 命名（我假设它是 cpAnswer ），然后使用模板的 FindName 方法：

Give a name to the ContentPresenter (I will assume it is cpAnswer), and access the textbox with the FindName method of the template :

TextBox textBoxAnswer = cpAnswer.ContentTemplate.FindName("textBoxAnswer", cpAnswer) 
as TextBox;

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