如何在 ToolTip 中绑定其他元素 [英] How to binding other element in ToolTip

问题描述

我想在 Tooltip 中绑定 Text 但我有一个问题，它绑定的值是其他元素控件，因此我基本上无法通过绑定获取它们的值.

I want binding Text in Tooltip but i have one problem, it is binding value is other element controls, therefore i cannot basically get their value through binding.

<TextBlock x:Name="txb2" Text="Hello Stackoverflow"/>

<TextBox Grid.Row="1" TextChanged="TextBox_TextChanged">
    <TextBox.ToolTip>
        <TextBlock>
            <Run Text="{Binding ElementName=txb2, Path=Text}" FontWeight="Bold"/>
        </TextBlock>
    </TextBox.ToolTip>
</TextBox>

基本上我尝试绑定此代码.

basically I tried binding this code.

推荐答案

如果您查看输出，您会看到一个错误:

If you look at the output you will see an error:

System.Windows.Data 错误:4:无法找到用于绑定的源参考 'ElementName=txb2'.BindingExpression:Path=Text;数据项=空；目标元素是运行"(HashCode=58577354)；目标属性是文本"(类型字符串")

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=txb2'. BindingExpression:Path=Text; DataItem=null; target element is 'Run' (HashCode=58577354); target property is 'Text' (type 'String')

您可以使用 x:Reference 修复它:

You can fix it by using x:Reference:

<TextBlock x:Name="txb2" Text="Hello Stackoverflow"/>

<TextBox Grid.Row="1">
    <TextBox.ToolTip>
        <TextBlock>
            <Run Text="{Binding Source={x:Reference txb2}, Path=Text}" FontWeight="Bold"/>
        </TextBlock>
    </TextBox.ToolTip>
</TextBox>

至于ElementName和x的区别:参考看下面线程.ElementName 不起作用，因为 Tooltip 不是 Ui 属性，但 ElementName 在搜索 txb2 时仅适用于 Ui 元素层次结构(可视化树).

As for the difference between ElementName and x:Reference take a look at the following thread. ElementName does not work since Tooltip is not a Ui property, but ElementName only works with Ui Element hierarchy (Visual Tree) when it searches txb2.

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