从 ItemsControl 中的模板获取项目
我有一个 ItemsControl，其中填充了一些 ViewModel 类的可观察集合，如下所示：
<ItemsControl ItemsSource="{Binding MyCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate Type="{x:Type local:MyViewModel}">
<Button Content="{Binding ActionName}" Click="ClickHandler"/>
</DataTemplate>
<ItemsControl.ItemTemplate>
</ItemsControl>
效果很好，看起来很棒，但我似乎无法弄清楚如何让“ClickHandler”了解“MyViewModel”类由数据模板表示。看哪！
private void ClickHandler(object sender, RoutedEventArgs e)
{
// The 'sender' is the button that raised the event. Great!
// Now how do I figure out the class (MyViewModel) instance that goes with this button?
}
I have an ItemsControl that is populated with an observable collection of some ViewModel classes, like so:
<ItemsControl ItemsSource="{Binding MyCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate Type="{x:Type local:MyViewModel}">
<Button Content="{Binding ActionName}" Click="ClickHandler"/>
</DataTemplate>
<ItemsControl.ItemTemplate>
</ItemsControl>
Works great, looks great, but I can't seem to figure out how to get the "ClickHandler" to be aware of the class 'MyViewModel' that is represented by the data template. Behold!
private void ClickHandler(object sender, RoutedEventArgs e)
{
// The 'sender' is the button that raised the event. Great!
// Now how do I figure out the class (MyViewModel) instance that goes with this button?
}
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好吧，我几乎立即意识到这是“发送者”的“DataContext”。我将保留这个问题，除非社区认为这个问题太明显了。
OK duh, I almost immediately realized that it is the 'DataContext' of the 'sender'. I am going to leave this up unless the community thinks that this question is just too obvious.
在这种特定情况下，您自己的答案将发挥作用。这是另一种技术，虽然要复杂得多，但无论复杂程度如何，都适用于任何场景：
从
sender（这是一个Button）开始，使用VisualTreeHelper.GetParent直到您找到一个ContentPresenter。这是您为每个项目指定的ItemTemplate托管的UIElement类型。我们将ContentPresenter放入变量cp中。 （重要提示：如果您的ItemsControl是ListBox，那么我们将寻找ListBoxItem而不是ContentPresenter代码>等）。然后，调用
ItemsControl.ItemContainerGenerator.ItemFromContainer （cp）。为此，您需要对特定的ItemsControl有一些引用，但这应该不难 - 例如，您可以给它一个Name并使用FrameworkElement.FindName从你的视图本身。ItemFromContainer方法将返回您的 ViewModel。所有这些都是我从 博士 WPF 。
Your own answer will do the trick in this specific case. Here's another technique which, while much more complicated, will also work on any scenario regardless of complexity:
Starting from
sender(which is aButton), useVisualTreeHelper.GetParentuntil you find aContentPresenter. This is the type ofUIElementthat theItemTemplateyou specified is hosted into for each of your items. Let's put thatContentPresenterinto the variablecp. (Important: if yourItemsControlwere aListBox, then instead ofContentPresenterwe 'd look for aListBoxItem, etc).Then, call
ItemsControl.ItemContainerGenerator.ItemFromContainer(cp). To do that, you will need to have some reference to the specificItemsControlbut this shouldn't be hard -- you can, for example, give it aNameand useFrameworkElement.FindNamefrom your View itself. TheItemFromContainermethod will return your ViewModel.All of this I learned from the stupidly useful and eye-opening posts of Dr. WPF.