WPF：如何处理位于单独文件中的 DataTemplate 中的事件？

发布于 2024-10-11 18:18:19 字数 2438 浏览 4 评论 0原文

我有一个带有 ListView 控件的 DataTemplate。此 DataTemplate 位于 Templates.xaml（它是一个 ResourceDictionary）中。然后，Template.xaml 通过 ResourceDictionary.MergedDictionaries 包含到我的主 UserControl SourceManager.xaml 中。我想引发 DataTemplate 的 ListView 的 SelectionChanged 事件，但我希望后面的代码中的处理程序位于 SourceManager.xaml.cs 中。

我怎样才能做到这一点？

模板.xaml：

<ResourceDictionary x:Class="LawBib.Templates"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<DataTemplate x:Key="SectionTemplate">
    <StackPanel>
        <TextBlock Text="{Binding XPath=@Title}" />
        <ListView x:Name="GroupList" ItemsSource="{Binding XPath=Source}">
            <ListView.Template>
                <ControlTemplate>
                    <WrapPanel IsItemsHost="True">

                    </WrapPanel>
                </ControlTemplate>
            </ListView.Template>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <Image Source="images/source.png" />
                        <TextBlock Text="{Binding XPath=@Title}" HorizontalAlignment="Center" />
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackPanel>
</DataTemplate>

SourceManager.xaml：

<UserControl x:Class="LawBib.SourceManager"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300" Background="#f5f7f8">
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources.xaml" />
                <ResourceDictionary Source="Templates.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </UserControl.Resources>
...
</UserControl>

原文

I have a DataTemplate with a ListView control. This DataTemplate is located in Templates.xaml (which is a ResourceDictionary). Template.xaml is then included into my main UserControl SourceManager.xaml through ResourceDictionary.MergedDictionaries. I want to raise the SelectionChanged event of the DataTemplate's ListView but I want the handler in the code behind to be in SourceManager.xaml.cs.

How can I achieve that?

Templates.xaml:

<ResourceDictionary x:Class="LawBib.Templates"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<DataTemplate x:Key="SectionTemplate">
    <StackPanel>
        <TextBlock Text="{Binding XPath=@Title}" />
        <ListView x:Name="GroupList" ItemsSource="{Binding XPath=Source}">
            <ListView.Template>
                <ControlTemplate>
                    <WrapPanel IsItemsHost="True">

                    </WrapPanel>
                </ControlTemplate>
            </ListView.Template>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <Image Source="images/source.png" />
                        <TextBlock Text="{Binding XPath=@Title}" HorizontalAlignment="Center" />
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackPanel>
</DataTemplate>

SourceManager.xaml:

<UserControl x:Class="LawBib.SourceManager"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300" Background="#f5f7f8">
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources.xaml" />
                <ResourceDictionary Source="Templates.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </UserControl.Resources>
...
</UserControl>

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挽清梦 2024-10-18 18:18:19

由于 SelectionChanged 是一个 RoatedEvent，因此您可以将其应用到您的 UserControl，如下所示：

<UserControl ...
             ListView.SelectionChanged="MyEventHandler" />

请注意，将为 调用此事件处理程序所有属于 UserControl 后代的 Selector 派生类（因为 Selector 是定义和引发事件的地方），其中包括组合框、菜单、列表框等。

Since SelectionChanged is a RoutedEvent, you can apply it to your UserControl like so:

<UserControl ...
             ListView.SelectionChanged="MyEventHandler" />

Be aware that this event handler will be called for all Selector derived classes (as Selector is where the event is defined and raised) that are descendants of your UserControl, which includes ComboBox, Menu, ListBox, etc.

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