WPF Treeview 样式 EventSetter 不起作用 [英] WPF Treeview Style EventSetter dont work

问题描述

你好，我的事件设置器有问题.
我的窗口:

Hallo i have a problem with an eventsetter.
My Window:

<TreeView.Resources>
    <ResourceDictionary> 
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary 
                 Source="CrefoChartTreeViewItemStyle.xaml" />
        </ResourceDictionary.MergedDictionaries>
        <HierarchicalDataTemplate 
            DataType="{x:Type local:Node}" 
            ItemsSource="{Binding ChildNodes}">
        </HierarchicalDataTemplate>
    </ResourceDictionary>
</TreeView.Resources>

我的 CrefoChartTreeViewItemStyle.xaml

My CrefoChartTreeViewItemStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing"
mc:Ignorable="d"
>
    <Style TargetType="TreeViewItem">
        <Style.Resources>
            <LinearGradientBrush x:Key="ButtonBrush" EndPoint="0,1" StartPoint="0,0">
                <GradientStop Color="White" Offset="0.25"/>
                <GradientStop Color="#FFA5DBE9" Offset="1"/>
            </LinearGradientBrush>
            <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
                <Setter Property="Background" Value="{DynamicResource ButtonBrush}" />
                <EventSetter Event="Click" Handler="ButtonOnClick" />
            </Style>
        </Style.Resources>  

我在编译时收到错误消息:

I get the Error Message when i Compile:

The event 'click' can not be specified on a Target tag in a Style. Instead, use "EventSetter".

我做错了什么?

有没有其他方法可以触发树视图中的这个按钮?所以我可以把代码放在后面?

Is there any other way to get this button in the treeview triggerd? so i can put Code behind?

推荐答案

这行不通，因为资源 xaml 不能有代码隐藏文件，它们通常被称为loose xaml"".您可以在有关 EventSetter 的 msdn 中阅读相关内容.您可以并且应该做的是使用将您的事件转换为命令的东西，例如 AttachedCommandBehavior 这与 MVVM 一起工作得非常好.如果你想使用你所要求的事件，你可以将 TreeView 放在一个 UserControl 中，然后你就可以使用事件了.

This won't work, Because a resource xaml can't have a code behind file, they are usually called "loose xaml". You can read about that in the msdn about EventSetter. What you can and should do is to use something that converts your events to commands, like the AttachedCommandBehavior this works very nicely together with MVVM. If you want to use events like you asked for, you can place the TreeView in a UserControl, and then you can use events.

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