触发内容模板 [英] Triggered Content Template

问题描述

我想设置一个变化基于一个DataTrigger一个的ContentTemplate。 Syntatically，我觉得这应该工作，但它会导致堆栈溢出试图渲染页面时：

I'm trying to set up a ContentTemplate that changes based on a DataTrigger. Syntatically, I feel like this should work, but it results in a stack overflow when trying to render the page:

<ItemsControl ItemsSource="{Binding Path=ExtendedFieldCollection}" ItemTemplate="{StaticResource RequiredFieldsTemplate}" />

<!--Where-->
<DataTemplate x:Key="RequiredFieldsTemplate">
    <ContentPresenter>
        <ContentPresenter.Style>
            <Style TargetType="ContentPresenter">
                <Setter Property="ContentTemplate" Value="{x:Null}"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding IsRequired}" Value="True">
                        <Setter Property="ContentTemplate" Value="{StaticResource MyFieldDisplayTemplate}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ContentPresenter.Style>
    </ContentPresenter>
</DataTemplate>

只需要去

Simply going

<DataTemplate x:Key="RequiredFieldsTemplate">
    <ContentPresenter ContentTemplate="{StaticResource MyFieldDisplayTemplate}" />

精品工程 - 但我想要做到的是绑定到字段列表，但只显示所需的字段。我不能只用能见度=崩溃，有在 MyFieldDisplayTemplate 实例的所有自定义控件巨大的开销。我的目标是让非必填字段有一个完全不同的（空）控制ItemsControl中的模板。

Works fine - but what I'm trying to accomplish is to bind to a list of fields, but only display the required fields. I can't just use Visibility=collapsed, there is huge overhead in instantiating all the custom controls in the MyFieldDisplayTemplate. My goal is to have non-required fields have a completely different (empty) control template in the ItemsControl.

这是如何设置这个触发任何想法？

Any ideas on how to set up this trigger?

推荐答案

我理解了它感谢在这个问题绊脚石：的 WPF：如何设置数据模板触发内容控制

I figured it out thanks to stumbling upon this question: WPF: How to set the data template trigger for content control?

我应该使用一个ContentControl中 - 不是一个ContentPresenter。奇怪，这两个行为相同的，当你使用它们的一种方式，但完全不同，当你想使用触发器。 。多少一如既往学习

I should be using a ContentControl - not a ContentPresenter. Strange, the two behave the same when you use them one way, but completely differently when you want to use triggers. Much to learn as always.

<DataTemplate x:Key="RequiredFieldsTemplate">
    <ContentControl>
        <ContentControl.Style>
            <Style TargetType="ContentPresenter">
                <Setter Property="ContentTemplate" Value="{x:Null}"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding IsRequired}" Value="True">
                        <Setter Property="ContentTemplate" Value="{StaticResource MyFieldDisplayTemplate}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ContentControl.Style>
    </ContentControl>
</DataTemplate>

这篇关于触发内容模板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！