C# WPF 中的变量绑定
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Variable Bindings in WPF
提问by Joseph Sturtevant
I'm creating a UserControl for a rich TreeView (one that has context menus for renaming nodes, adding child nodes, etc.). I want to be able to use this control to manage or navigate any hierarchical data structures I will create. I currently have it working for any data structure that implements the following interface (the interface need not actually be implemented, however, only the presence of these members is required):
我正在为丰富的 TreeView 创建一个 UserControl（一个具有用于重命名节点、添加子节点等的上下文菜单）。我希望能够使用此控件来管理或导航我将创建的任何分层数据结构。我目前让它适用于实现以下接口的任何数据结构（实际上不需要实现接口，但是，只需要这些成员的存在）：
interface ITreeItem
{
string Header { get; set; }
IEnumerable Children { get; }
}
Then in my UserControl, I use templates to bind my tree to the data structure, like so:
然后在我的 UserControl 中，我使用模板将我的树绑定到数据结构，如下所示：
<TextBlock x:Name="HeaderTextBlock" Text="{Binding Path=Header}" />
What I would like to do is define the name of each of these members in my RichTreeView, allowing it to adapt to a range of different data structures, like so:
我想做的是在 RichTreeView 中定义每个成员的名称，使其适应一系列不同的数据结构，如下所示：
class MyItem
{
string Name { get; set; }
ObservableCollection<MyItem> Items;
}
<uc:RichTreeView ItemSource={Binding Source={StaticResource MyItemsProvider}}
HeaderProperty="Name" ChildrenProperty="Items" />
Is there any way to expose the Path of a binding inside a UserControl as a public property of that UserControl? Is there some other way to go about solving this problem?
有没有办法将 UserControl 内绑定的 Path 公开为该 UserControl 的公共属性？有没有其他方法可以解决这个问题？
采纳答案by Arcturus
Perhaps this might help:
也许这可能会有所帮助：
Create a new Binding when you set the HeaderProperty property on the Header dependency property:
在 Header 依赖属性上设置 HeaderProperty 属性时创建一个新的 Binding：
Header property is your normal everyday DependencyProperty:
Header 属性是你日常的 DependencyProperty：
public string Header
{
get { return (string)GetValue(HeaderProperty); }
set { SetValue(HeaderProperty, value); }
}
public static readonly DependencyProperty HeaderProperty =
DependencyProperty.Register("Header", typeof(string), typeof(ownerclass));
and the property of your HeaderProperty works as follows:
并且您的 HeaderProperty 属性的工作方式如下：
public static readonly DependencyProperty HeaderPropertyProperty =
DependencyProperty.Register("HeaderProperty", typeof(string), typeof(ownerclass), new PropertyMetadata(OnHeaderPropertyChanged));
public string HeaderProperty
{
get { return (string)GetValue(HeaderPropertyProperty); }
set { SetValue(HeaderPropertyProperty, value); }
}
public static void OnHeaderPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
if (args.NewValue != null)
{
ownerclass c = (ownerclass) obj;
Binding b = new Binding();
b.Path = new PropertyPath(args.NewValue.ToString());
c.SetBinding(ownerclass.HeaderProperty, b);
}
}
HeaderProperty is your normal everyday DependencyProperty, with a method that is invoked as soon as the HeaderProperty changes. So when it changes , it creates a binding on the Header which will bind to the path you set in the HeaderProperty. :)
HeaderProperty 是您日常使用的普通 DependencyProperty，其方法会在 HeaderProperty 更改后立即调用。因此，当它更改时，它会在 Header 上创建一个绑定，该绑定将绑定到您在 HeaderProperty 中设置的路径。:)
