WPF 绑定到内容控件的内容属性
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WPF bind to content control's content property
提问by Shahin
How can I bind to content control's content property ?
I'v created custom control :
如何绑定到内容控件的内容属性？
我创建了自定义控件：
public class CustomControl
{
// Dependency Properties
public int MyProperty
{
get { return (int)GetValue(MyPropertyProperty); }
set { SetValue(MyPropertyProperty, value); }
}
// Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc...
public static readonly DependencyProperty MyPropertyProperty =
DependencyProperty.Register("MyProperty", typeof(int), typeof(MainViewModel), new PropertyMetadata(0));
}
In ViewModel I created a property of type of this custom control :
在 ViewModel 中，我创建了这个自定义控件类型的属性：
public CustomControl CustomControl { get; set; }
In view I bind this property to content control :
鉴于我将此属性绑定到内容控件：
<ContentControl x:Name="Custom" Content="{Binding CustomControl}"></ContentControl>
Now how can I bind to content control's content property?
现在如何绑定到内容控件的内容属性？
回答by JRoughan
<ContentControl Content="{Binding ElementName=Custom, Path=Content}" />
I'm not sure what effect this will have though. I have a suspicion it will complain about UI elements already having a parent or something similar.
我不确定这会产生什么影响。我怀疑它会抱怨 UI 元素已经有一个父元素或类似的东西。
Update
更新
If I think I understand your question correctly I don't think you can do what you want using bindings. This is an alternative which adds a callback for when the content is changed so you can set the new content to the property of your VM:
如果我认为我正确理解了您的问题，我认为您无法使用绑定来做您想做的事。这是一种替代方法，它在内容更改时添加回调，以便您可以将新内容设置为 VM 的属性：
class CustomControl : Control
{
static CustomControl()
{
ContentControl.ContentProperty.OverrideMetadata(typeof(CustomControl), new PropertyMetadata(null, UpdateViewModel));
}
private static void UpdateViewModel(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = d as CustomControl;
var viewModel = control.DataContext as MyViewModel;
viewModel.CustomControl = control;
}
}
You'll probably want some error handling in there.
您可能需要在那里进行一些错误处理。
