绑定一个绑定的路径属性 [英] Binding the Path Property of a Binding

问题描述

是否可以将绑定的 Path 属性绑定到另一个属性?

is it possible to bind the Path property of a binding to another property?

我想实现这段代码:

Text="{Binding Path={Binding Path=CurrentPath}}"

所以我可以动态调整我的实际绑定所引用的属性.

So I can adjust dynamically to which Property my actual binding is refering.

感谢您的帮助乔尼

推荐答案

我自己解决的.

这是解决方案，我希望它可以帮助和我一样遇到同样问题的人.

Heres the solution, I hope it might help anyone got the same problem like me.

public class CustomBindingBehavior : Behavior<FrameworkElement>
{
    public bool IsBinding
    {
        get
        {
            return (bool)GetValue(IsBindingProperty);

        }
        set
        {
            SetValue(IsBindingProperty, value);
        }
    }

    public string PropertyPath
    {
        get
        {
            return (string)GetValue(PropertyPathProperty);

        }
        set
        {
            SetValue(PropertyPathProperty, value);
        }
    }

    public static DependencyProperty
        PropertyPathProperty = DependencyProperty.Register("PropertyPath", typeof(string),
                        typeof(CustomBindingBehavior), null);

    public static DependencyProperty
        IsBindingProperty = DependencyProperty.Register("IsBinding", typeof(bool),
                        typeof(CustomBindingBehavior), null);

    protected override void OnAttached()
    {
        if (AssociatedObject is TextBlock)
        {
            var tb = AssociatedObject as TextBlock;
            tb.Loaded += new RoutedEventHandler(tb_Loaded);
        }
    }

    private void tb_Loaded(object sender, RoutedEventArgs e)
    {
        AddBinding(sender as TextBlock, TextBlock.TextProperty);
    }

    private void AddBinding(DependencyObject targetObj, DependencyProperty targetProp)
    {
        if (IsBinding)
        {
            Binding binding = new Binding();
            binding.Path = new PropertyPath(this.PropertyPath, null);

            BindingOperations.SetBinding(targetObj, targetProp, binding);
        }
        else
        {
            targetObj.SetValue(targetProp, this.PropertyPath);
        }
    }
}

这里是 XAML 中的实现:

And heres the implementation in XAML:

<TextBlock >
                <i:Interaction.Behaviors>
                    <behaviors:CustomBindingBehavior PropertyPath="{Binding Path=HeaderPropertyBinding}" IsBinding="{Binding Path=HeaderIsBinding}" />
                </i:Interaction.Behaviors>
            </TextBlock>

您好乔尼

这篇关于绑定一个绑定的路径属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！