silverlight - 向文本框添加依赖属性

Question

如何将依赖属性添加到文本框并将依赖属性绑定(bind)到银光中的 bool 属性。我的 bool 属性在我的 View 模型中。

ImageSearchIsFocused 是允许我将焦点设置在文本框上的属性。

<TextBox  Text="{Binding ImgSearch, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">   
    <i:Interaction.Behaviors>
        <common:FocusBehavior HasInitialFocus="True" IsFocused="{Binding ImageSearchIsFocused, Mode=TwoWay}" ></common:FocusBehavior>
    </i:Interaction.Behaviors>
</TextBox>

ImageIsFocused 属性

bool _ImageSearchIsFocused;
public bool ImageSearchIsFocused
{
    get { return _ImageSearchIsFocused; }
    set
    { 
        _ImageSearchIsFocused = value;
        NotifyPropertyChanged("ImageSearchIsFocused");
    }
}

Answer 1

如果要添加依赖属性，您将拥有 TextBox 的子类并将依赖属性添加到您的子类。然后你可以把它绑定(bind)到你喜欢的任何东西上:

public class MyTextBox : TextBox
{ 

    public static readonly DependencyProperty MyBooleanValueProperty = DependencyProperty.Register(
        "MyBooleanValue", typeof(bool), typeof(MyTextBox),
        new PropertyMetadata(new PropertyChangedCallback(MyBooleanValueChanged)));
    public bool MyBooleanValue
    {
        get { return (bool)GetValue(MyBooleanValueProperty); }
        set { SetValue(MyBooleanValueProperty, value); }
    }

    private static void MyBooleanValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var propValue = (bool)e.NewValue;
        var control = d as MyTextBox;

        // do something useful
    }

}