将数据上下文上的属性绑定到数据上下文中包含的另一个对象

发布于 2024-12-11 13:13:18 字数 738 浏览 0 评论 0原文

考虑下面所示的场景

class MyViewModel
{
    public bool IsSelected {get;set;}
}

class SomeClass
{
    public bool IsSelected {get;set;}
    public object Data {get;}
}

<DataTemplate x:Key="ItemTemplate>
    <Image ... />
</DataTemplate>

<SomeControl ItemsSource={Binding MyViewModels}"
             ItemTemplate={StaticResource ItemTemplate}" />

SomeControl 和 SomeClass 类是我无法修改的第三方类。在内部，SomeControl 创建 SomeClass 的实例，并将我的视图模型分配给它的 Data 属性。因此，我的 ItemTemplate 的数据上下文是 SomeClass

我想将 SomeClass 上的 IsSelected 属性绑定到 IsSelected MyViewModel 的属性。我该怎么做？

原文

Consider the scenario shown below

class MyViewModel
{
    public bool IsSelected {get;set;}
}

class SomeClass
{
    public bool IsSelected {get;set;}
    public object Data {get;}
}

<DataTemplate x:Key="ItemTemplate>
    <Image ... />
</DataTemplate>

<SomeControl ItemsSource={Binding MyViewModels}"
             ItemTemplate={StaticResource ItemTemplate}" />

The classes SomeControl and SomeClass are third party classes which I cannot modify. Internally, SomeControl creates instances of SomeClass and assigns my view model to its Data property. So, the data context of my ItemTemplate is SomeClass

I want to bind the IsSelected property on SomeClass to the IsSelected property of MyViewModel. How do I do that?

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娇女薄笑 2024-12-18 13:13:18

首先，我会考虑放弃一个第三方控件，该控件的功能与 ItemsControl 的正常工作方式不一致。您的数据上下文应该是您的视图模型。时期。

也就是说，如果项目容器是这样的 SomeClass ，您应该能够解决这个问题：

<SomeControl ...>
    <SomeControl.ItemContainerStyle>
        <Style TargetType="SomeClass">
            <Setter Property="IsSelected" Value="{Binding Data.IsSelected, Mode=TwoWay}"/>
        </Style>
    </SomeControl.ItemContainerStyle>
</SomeControl>

First, I would consider ditching a third-party control that does something so at odds with how the ItemsControl normally works. Your data context should be your view model. Period.

That said, you should be able to work around it if the item container is a SomeClass like this:

<SomeControl ...>
    <SomeControl.ItemContainerStyle>
        <Style TargetType="SomeClass">
            <Setter Property="IsSelected" Value="{Binding Data.IsSelected, Mode=TwoWay}"/>
        </Style>
    </SomeControl.ItemContainerStyle>
</SomeControl>

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