如何将自定义 UserControl 绑定到 ItemTemplate 内的当前项目？
我有一个 ListBox，它的数据绑定到 ObservableCollection。
在 DataTemplate 内，我有一个想要绑定到当前项目的自定义用户控件。 我该怎么做？ 绑定路径应该是什么？
模型：
private ObservableCollection<MyItem> _items;
public ObservableCollection<MyItem> Items
{
get { return _items; }
set
{
if (_items.Equals(value))
return;
_items = value;
RaisePropertyChanged("Items");
}
}
XAML：
<ListBox ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock TextWrapping="Wrap" Text="{Binding Id}" Margin="2"/>
<TextBlock TextWrapping="Wrap" Text="{Binding Name}" Margin="2"/>
<uc:MyControl MyValue="{Binding <WHATSHOULDTHISBE>, Mode=TwoWay}" Margin="2"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
用户控制：
public partial class MyControl : UserControl
{
public MyItem MyValue
{
get { return (MyItem)GetValue(MyProperty); }
set { SetValue(MyProperty, value); }
}
public static readonly DependencyProperty MyProperty = DependencyProperty.Register("MyValue",
typeof(MyItem), typeof(MyControl),
new PropertyMetadata(
new PropertyChangedCallback(PropertyChanged)));
public MyControl()
{
InitializeComponent();
}
private static void PropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyControl c = obj as MyControl;
if (c != null)
{
// TODO: do something here
}
}
}
I have a ListBox that is data bound to an ObservableCollection.
Inside the DataTemplate, I have this custom user control that I want to bind to the current item.
How do I do that?
What should the binding path be?
Model:
private ObservableCollection<MyItem> _items;
public ObservableCollection<MyItem> Items
{
get { return _items; }
set
{
if (_items.Equals(value))
return;
_items = value;
RaisePropertyChanged("Items");
}
}
XAML:
<ListBox ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock TextWrapping="Wrap" Text="{Binding Id}" Margin="2"/>
<TextBlock TextWrapping="Wrap" Text="{Binding Name}" Margin="2"/>
<uc:MyControl MyValue="{Binding <WHATSHOULDTHISBE>, Mode=TwoWay}" Margin="2"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
User control:
public partial class MyControl : UserControl
{
public MyItem MyValue
{
get { return (MyItem)GetValue(MyProperty); }
set { SetValue(MyProperty, value); }
}
public static readonly DependencyProperty MyProperty = DependencyProperty.Register("MyValue",
typeof(MyItem), typeof(MyControl),
new PropertyMetadata(
new PropertyChangedCallback(PropertyChanged)));
public MyControl()
{
InitializeComponent();
}
private static void PropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyControl c = obj as MyControl;
if (c != null)
{
// TODO: do something here
}
}
}
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评论（2）
MyControl.DataContext 属性已经绑定到您的项目视图模型。
MyControl.DataContext property would already be bound to your item view model in this case.
您的 MyItem 是数据上下文 - 如果您想绑定到 My Item 的某个成员，那么它：
要完整地绑定到 MyItem 我认为您想要：
您可能还需要一个用于控件的 DataTemplate （除了您拥有的ListBoxItems）将 MyItems 成员映射到您的控制字段。
Your MyItem is the data context - if you want to bind to some member of My Item then its:
To bind to MyItem in its entirety I think you want:
Your might also need a DataTemplate for your control (in addition to the you have for the ListBoxItems) that maps the MyItems members to your control fields.