wpf MVVM：绑定到 ListBox.SelectedItem？
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MVVM: Binding to ListBox.SelectedItem?
提问by David Veeneman
How do I bind a view model property to the ListBox.SelectedItem property?
如何将视图模型属性绑定到 ListBox.SelectedItem 属性？
I have created a simple MVVM demo to try to figure this one out. My view model has these properties:
我创建了一个简单的 MVVM 演示来尝试解决这个问题。我的视图模型具有以下属性：
private ObservableCollection<DisneyCharacter> p_DisneyCharacters;
public ObservableCollection<DisneyCharacter> DisneyCharacters
{
get { return p_DisneyCharacters; }
set
{
p_DisneyCharacters = value;
base.FirePropertyChangedEvent("DisneyCharacters");
}
}
private DisneyCharacter p_SelectedItem;
public DisneyCharacter SelectedItem
{
get { return p_SelectedItem; }
set
{
p_SelectedItem = value;
base.FirePropertyChangedEvent("SelectedItem");
}
}
I want to bind the SelectedItem property to the item selected in the list box. Here is the XAML for the list box:
我想将 SelectedItem 属性绑定到列表框中选定的项目。这是列表框的 XAML：
<ListBox ItemTemplate="{StaticResource MasterTemplate}"
ItemsSource="{Binding Path=DisneyCharacters}"
SelectedItem="{Binding Path=Selectedtem, Mode=TwoWay}"
HorizontalAlignment="Stretch" />
Here is my problem: The view model SelectedItem property isn't being updated when I change the selection in the list box.
这是我的问题：当我更改列表框中的选择时，视图模型 SelectedItem 属性没有更新。
I did a test where I temporarily replaced the view model SelectedItem property with a SelectedIndex property, and I bound that to the ListBox.SelectedIndex property. That property updated fine--it's just the SelectedItem property that I can't get to work.
我做了一个测试，我临时用 SelectedIndex 属性替换了视图模型 SelectedItem 属性，并将其绑定到 ListBox.SelectedIndex 属性。该属性更新得很好——它只是我无法开始工作的 SelectedItem 属性。
So, how do I fix the SelectedItem binding? Thanks for your help.
那么，如何修复 SelectedItem 绑定？谢谢你的帮助。
回答by David Veeneman
Well, there it is, big as life. In the XAML. I am binding to a view model property "Selectedtem". Unfortunately, the actual name is "SelectedItem". So this code actually works--I solved the problem early this afternoon and then spent the rest of the afternoon and all evening scouring the web, before I noticed the spelling error.
好吧，它就在那里，就像生命一样大。在 XAML 中。我绑定到视图模型属性“Selectedtem”。不幸的是，实际名称是“SelectedItem”。所以这段代码确实有效——我今天下午早些时候解决了这个问题，然后花了整个下午和整个晚上的时间在网上搜索，然后才发现拼写错误。
My wife told me at 3:00 this afternoon, "You know, it's going to turn out to be something small." And so it did--a missing letter "I". Well, at least I can go to bed now.
我妻子在今天下午 3:00 告诉我，“你知道，结果会是一件小事。” 所以它确实 - 一个丢失的字母“I”。好吧，至少我现在可以去睡觉了。
