WPF：从具有自定义行为的类绑定到属性
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WPF: binding to properties from class with custom behavior
提问by gbk
using WPF, c#, VS 2012
使用 WPF、C#、VS 2012
Try to implement some custom behaviors for UI with WPF.
Currently create class that inherited from Behavior<FrameworkElement>
尝试使用 WPF 为 UI 实现一些自定义行为。当前创建继承自的类Behavior<FrameworkElement>
Idea: create one area on UI for entering name (I used textBox) - another area (Rectangle) - press and see some action with data from prev field.
想法：在 UI 上创建一个用于输入名称的区域（我使用文本框）-另一个区域（矩形）-按下并查看带有来自上一个字段的数据的一些操作。
What was done:
做了什么：
Class for implementing idea (class with Behavior)
实现想法的类（带有行为的类）
class SayHello: Behavior<FrameworkElement>
{
public string Words { get; set; }
protected override void OnAttached()
{
AssociatedObject.MouseLeftButtonUp += OnMouseClick;
}
private void OnMouseClick(object sender,
System.Windows.Input.MouseButtonEventArgs e)
{
MessageBox.Show(string.Format("hello , {0}", Words));
}
protected override void OnDetaching()
{
AssociatedObject.MouseLeftButtonUp -= OnMouseClick;
}
}
XAML:
XAML：
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
xmlns:local="clr-namespace:CH08.MovingCircle"
x:Class="CH08.MovingCircle.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Canvas>
<Border Canvas.Top="220" BorderBrush="Black"
BorderThickness="2">
<TextBox x:Name="_enteredWords" Width="200"/>
</Border>
<Rectangle Stroke="Blue" Canvas.Top="250" Fill="Aquamarine"
Width="200" Height="50">
<i:Interaction.Behaviors>
<local:SayHello
Words="{Binding Text, ElementName=_enteredWords}"/>
</i:Interaction.Behaviors>
</Rectangle>
</Canvas>
Got error : A 'Binding' cannot be set on the 'Words' property of type 'SayHello'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject...
有错误： A 'Binding' cannot be set on the 'Words' property of type 'SayHello'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject...
If i change part of XAML to
如果我将 XAML 的一部分更改为
<Rectangle Stroke="Blue" Canvas.Top="250" Fill="Aquamarine"
Width="200" Height="50">
<i:Interaction.Behaviors>
<local:SayHello
Words="Adbracadabra"/>
</i:Interaction.Behaviors>
</Rectangle>
- all works (mean just remove binding).
- 一切正常（意味着只是删除绑定）。
Question: are it's possible to create binding to properties for class with custom behavior? If yes, how can i do this?
问题：是否可以为具有自定义行为的类创建与属性的绑定？如果是，我该怎么做？
EDIT:
编辑：
As was suggested by vfabre - changed property to dependency property
正如 vfabre 所建议的那样 - 将属性更改为依赖属性
public string Words
{
get { return (string)GetValue(WordsProperty); }
set { SetValue(WordsProperty, value); }
}
// Using a DependencyProperty as the backing store for Words.
//This enables animation, styling, binding, etc...
public static DependencyProperty WordsProperty =
DependencyProperty.Register("Words", typeof(string),
typeof(SayHello), new PropertyMetadata(default(string)));
Result
结果
回答by vfabre
Maybe the error message give us the solution. You have to convert your Wordsproperty to a dependency propery the following is an example:
也许错误信息给了我们解决方案。您必须将您的Words属性转换为依赖属性，以下是一个示例：
public string Words
{
get { return (string)GetValue(WordsProperty); }
set { SetValue(WordsProperty, value); }
}
// Using a DependencyProperty as the backing store for Words. This enables animation, styling, binding, etc...
public static readonly DependencyProperty WordsProperty =
DependencyProperty.Register("Words", typeof(string), typeof(SayHello), new PropertyMetadata(default(string)));
//public string Words { get; set; }
I recommend you to use the code snnipet propdp. Tipping propdpand then tab+tab.
我建议您使用代码 snipet propdp。小费propdp然后tab+tab。
Hereyou can find more information about dependency properties.
您可以在此处找到有关依赖项属性的更多信息。
Regards
问候
EditChanged the default value from string.
编辑更改了字符串的默认值。
