如何在ControlTemplate中使用ElementName绑定？

Question

我有多个TextBlocks,它引用了我的应用程序中的不同元素.我的代码在页面中直接使用时工作正常.但是,我想创建一个ControlTemplate和一个ContentControl来减少代码的重复.

如何使用TemplateBinding从ContentControl传递对ElementName的引用到ControlTemplate？以下代码抛出此错误:

"无法将属性'ElementName'中的值转换为'System.String'类型的对象.'System.Windows.TemplateBindingExpression'类型的对象无法转换为'System.String'类型."

除了Tag属性之外,我还尝试了ContentStringFormat,它也没有用.

使用模板使其工作的正确方法是什么？

在此先感谢您的帮助,

---肖恩

这是代码示例:

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
    <Page.Resources>
        <ControlTemplate x:Key="MyTemplate" TargetType="{x:Type ContentControl}">
            <TextBlock Margin="{Binding ElementName={TemplateBinding Tag}, Path=Margin}" Text="{TemplateBinding Content}" TextAlignment="{Binding ElementName={TemplateBinding Tag}, Path=TextAlignment}" Width="{Binding ElementName={TemplateBinding Tag}, Path=Width}" />
        </ControlTemplate>
    </Page.Resources>
    <StackPanel>
        <TextBlock x:Name="AnotherElement" Margin="10" Text="Main TextBlock" TextAlignment="Center" Width="100" />
        <TextBlock x:Name="AnotherElement2" Margin="20" Text="Second TextBlock" TextAlignment="Left" Width="250" />
        <TextBlock Margin="{Binding ElementName=AnotherElement, Path=Margin}" Text="Here is my TextBlock!" TextAlignment="{Binding ElementName=AnotherElement, Path=TextAlignment}" TextTrimming="CharacterEllipsis" Width="{Binding ElementName=AnotherElement, Path=Width}" />
        <TextBlock Margin="{Binding ElementName=AnotherElement2, Path=Margin}" Text="Here is my Second TextBlock!" TextAlignment="{Binding ElementName=AnotherElement2, Path=TextAlignment}" TextTrimming="CharacterEllipsis" Width="{Binding ElementName=AnotherElement2, Path=Width}" />
        <ContentControl Content="Hello!" Tag="AnotherElement" Template="{StaticResource MyTemplate}" />
        <ContentControl Content="Hello Again!" Tag="AnotherElement2" Template="{StaticResource MyTemplate}" />
    </StackPanel>
</Page>

Answer 1

这似乎是一种模板化的有趣方式,但它可以完成,你只需要对你的绑定有点花哨.

下面的内容可行,但我仍然不认为这是模板控件的好方法

绑定TextBlock Tag到实际的Element,然后在ControlTemplate绑定Tag到Tag并使用其中的值,因为Tag是Element,您可以使用它中的任何元素.

<Page.Resources>
    <ControlTemplate x:Key="MyTemplate" TargetType="{x:Type ContentControl}">
        <TextBlock Name="_this" Tag="{TemplateBinding Tag}" Margin="{Binding ElementName=_this, Path=Tag.Margin}" Text="{TemplateBinding Content}" TextAlignment="{Binding ElementName=_this, Path=Tag.TextAlignment}" Width="{Binding ElementName=_this, Path=Tag.Width}" />
    </ControlTemplate>
</Page.Resources>
<StackPanel>
    <TextBlock x:Name="AnotherElement" Margin="10" Text="Main TextBlock" TextAlignment="Center" Width="100" />
    <TextBlock x:Name="AnotherElement2" Margin="20" Text="Second TextBlock" TextAlignment="Left" Width="250" />
    <TextBlock Margin="{Binding ElementName=AnotherElement, Path=Margin}" Text="Here is my TextBlock!" TextAlignment="{Binding ElementName=AnotherElement, Path=TextAlignment}" TextTrimming="CharacterEllipsis" Width="{Binding ElementName=AnotherElement, Path=Width}" />
    <TextBlock Margin="{Binding ElementName=AnotherElement2, Path=Margin}" Text="Here is my Second TextBlock!" TextAlignment="{Binding ElementName=AnotherElement2, Path=TextAlignment}" TextTrimming="CharacterEllipsis" Width="{Binding ElementName=AnotherElement2, Path=Width}" />
    <ContentControl Content="Hello!" Tag="{Binding ElementName=AnotherElement}" Template="{StaticResource MyTemplate}" />
    <ContentControl Content="Hello Again!" Tag="{Binding ElementName=AnotherElement2}" Template="{StaticResource MyTemplate}" />
</StackPanel>