MVVM：绑定到ListBox.SelectedItem？

问题描述

如何将视图模型属性绑定到ListBox.SelectedItem属性？

How do I bind a view model property to the ListBox.SelectedItem property?

我已经创建了一个简单的MVVM演示，以试图找出这一个。我的视图模型具有以下属性：

I have created a simple MVVM demo to try to figure this one out. My view model has these properties:

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");
    }
}

我想将SelectedItem属性绑定到所选项目在列表框中。这是列表框的XAML：

I want to bind the SelectedItem property to the item selected in the list box. Here is the XAML for the list box:

<ListBox ItemTemplate="{StaticResource MasterTemplate}"
         ItemsSource="{Binding Path=DisneyCharacters}"
         SelectedItem="{Binding Path=Selectedtem, Mode=TwoWay}"
         HorizontalAlignment="Stretch" />

这是我的问题：当我更改选择时，视图模型SelectedItem属性没有被更新列表框。

Here is my problem: The view model SelectedItem property isn't being updated when I change the selection in the list box.

我做了一个测试，我暂时用SelectedIndex属性替换了ViewItem属性，并将其绑定到ListBox.SelectedIndex属性。该属性更新了 - 它只是SelectedItem属性，我无法上班。

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.

那么如何修复SelectedItem绑定？感谢您的帮助。

So, how do I fix the SelectedItem binding? Thanks for your help.

推荐答案

嗯，那是一个很大的生活。在XAML中。我对一个视图模型属性Selectedtem有约束力。不幸的是，实际的名字是SelectedItem。所以这段代码实际上是有效的 - 我今天下午早些时候解决了这个问题，然后在下午剩下的时间里，整个晚上都在刷新网页，之后我注意到了拼写错误。

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.

我的妻子今天下午3点告诉我，你知道，这将是一个小小的事情。所以它是 - 一个失踪的信我。那么，至少我现在可以睡觉了。

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.

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