将 DataTrigger 应用于其绑定来自另一个控件的按钮？

发布于 2024-07-19 03:15:41 字数 805 浏览 4 评论 0原文

我正在尝试将 DataTrigger 应用于 Button，它取决于 TreeView 当前所选项目的属性。我的想法是，我想根据所选项目的属性更改 Button 的文本。

我所拥有的看起来像这样：

<Button x:Name="m_AddObject" Margin="192.708,0.909,6,6.363" Click="AddObject_Click" >
    <DataTrigger Binding="{Binding ElementName=ObjectTreeView, Path=SelectedItem.Removable}" Value="true">
        <Setter TargetName="m_AddObject" Property="Content" Value="Remove" />
    </DataTrigger>
</Button>

但我无法编译它。 Setter 抱怨“Content”无效，因为它没有限定类型名称，但如果我将其更改为“Button.Content”，它就会抱怨“对象引用未设置为对象的实例”。

我也尝试过：

<Setter TargetName="m_AddObject.Content" Value="Remove" />

虽然可以编译，但也不起作用。

我很困惑。

有任何想法吗？

谢谢！

原文

I'm trying to apply a DataTrigger to a Button and it depends on a property from the currently selected item of a TreeView. The idea is that I want to change the text of a Button depending on a property of the selected item.

What I have looks like this:

<Button x:Name="m_AddObject" Margin="192.708,0.909,6,6.363" Click="AddObject_Click" >
    <DataTrigger Binding="{Binding ElementName=ObjectTreeView, Path=SelectedItem.Removable}" Value="true">
        <Setter TargetName="m_AddObject" Property="Content" Value="Remove" />
    </DataTrigger>
</Button>

But I can't get it to compile. The Setter complains about "Content" not being valid because it doesn't have a qualifying type name, but if I change it to "Button.Content" it then complains of "Object reference not set to an instance of an object".

I also tried:

<Setter TargetName="m_AddObject.Content" Value="Remove" />

While that compiles, it didn't work either.

I'm stumped.

Any ideas?

Thanks!

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白云不回头 2024-07-26 03:15:41

DataTriggers 应在按钮的样式中定义。上面您尝试执行的操作本质上是使用 DataTriggers 作为按钮的“标签”（“内容”，如 WPF 所说）（而不是“确定”）。

这是临时的，所以它可能不完全正确，但它更接近你想要的：

<Button x:Name="m_AddObject"
        Margin="192.708,0.909,6,6.363"
        Click="AddObject_Click">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=ObjectTreeView, Path=SelectedItem.Removable}" Value="True">
                    <Setter Property="Content" Value="Remove" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

DataTriggers should be defined in a Style for the button. What you're trying to do above is essentially use a DataTriggers as the "label" (the "Content", as WPF puts it) for the button (instead of, say, "OK").

This is ad-hoc, so it might not be totally correct, but it's closer to what you want:

<Button x:Name="m_AddObject"
        Margin="192.708,0.909,6,6.363"
        Click="AddObject_Click">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=ObjectTreeView, Path=SelectedItem.Removable}" Value="True">
                    <Setter Property="Content" Value="Remove" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

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