C# 绑定。路径绑定

我怎样才能做到以下几点

<CheckBox Content="{Binding Caption}">
    <CheckBox.IsChecked>
        <Binding Path="{Binding PropertyName}"
                 Source="{Binding Source}" />
    </CheckBox.IsChecked>
</CheckBox>

想法是通过属性为绑定提供

路径

和

源

（在设计时未知）

public class CheckBoxCustomBindingBehavior : Behavior<CheckBox>
{
    protected override void OnAttached()
    {
        base.OnAttached();
    }

    public object Source
    {
        get
        {
            return (object)GetValue(SourceProperty);
        }
        set
        {
            SetValue(SourceProperty, value);
        }
    }

    // Using a DependencyProperty as the backing store for Source.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty SourceProperty =
        DependencyProperty.Register("Source", typeof(object), typeof(CheckBoxCustomBindingBehavior), new PropertyMetadata(null, OnSourceChanged));

    private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        (d as CheckBoxCustomBindingBehavior).ModifyBinding();
    }

    public string Path
    {
        get
        {
            return (string)GetValue(PathProperty);
        }
        set
        {
            SetValue(PathProperty, value);
        }
    }

    // Using a DependencyProperty as the backing store for Path.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty PathProperty =
        DependencyProperty.Register("Path", typeof(string), typeof(CheckBoxCustomBindingBehavior), new PropertyMetadata(string.Empty, OnPathChanged));

    private static void OnPathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        (d as CheckBoxCustomBindingBehavior).ModifyBinding();
    }

    private void ModifyBinding()
    {
        var source = Source ?? AssociatedObject.DataContext;
        if (source != null && !string.IsNullOrEmpty(Path))
        {
            Binding b = new Binding(Path);
            b.Source = source;
            AssociatedObject.SetBinding(CheckBox.IsCheckedProperty, b);
        }
    }
}

---

当前，在

中抛出异常，我将使用行为。下面的行为将获取源和路径，并相应地更新IsChecked属性的绑定。您可以扩展此功能以满足您的需要。目前，这仅限于IsChecked属性，您可以编写通用代码来支持所有属性

public class CheckBoxCustomBindingBehavior : Behavior<CheckBox>
{
    protected override void OnAttached()
    {
        base.OnAttached();
    }

    public object Source
    {
        get
        {
            return (object)GetValue(SourceProperty);
        }
        set
        {
            SetValue(SourceProperty, value);
        }
    }

    // Using a DependencyProperty as the backing store for Source.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty SourceProperty =
        DependencyProperty.Register("Source", typeof(object), typeof(CheckBoxCustomBindingBehavior), new PropertyMetadata(null, OnSourceChanged));

    private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        (d as CheckBoxCustomBindingBehavior).ModifyBinding();
    }

    public string Path
    {
        get
        {
            return (string)GetValue(PathProperty);
        }
        set
        {
            SetValue(PathProperty, value);
        }
    }

    // Using a DependencyProperty as the backing store for Path.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty PathProperty =
        DependencyProperty.Register("Path", typeof(string), typeof(CheckBoxCustomBindingBehavior), new PropertyMetadata(string.Empty, OnPathChanged));

    private static void OnPathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        (d as CheckBoxCustomBindingBehavior).ModifyBinding();
    }

    private void ModifyBinding()
    {
        var source = Source ?? AssociatedObject.DataContext;
        if (source != null && !string.IsNullOrEmpty(Path))
        {
            Binding b = new Binding(Path);
            b.Source = source;
            AssociatedObject.SetBinding(CheckBox.IsCheckedProperty, b);
        }
    }
}

公共类CheckBoxCustomBindingBehavior:Behavior
{
受保护的覆盖无效附加（）
{
base.onatached（）；
}
公共对象源
{
得到
{
返回（对象）GetValue（SourceProperty）；
}
设置
{
SetValue（SourceProperty，value）；
}
}
//使用DependencyProperty作为源的备份存储。这将启用动画、样式、绑定等。。。
公共静态只读DependencyProperty SourceProperty=
Register（“Source”、typeof（object）、typeof（CheckBoxCustomBindingBehavior）、newpropertyMetadata（null、OnSourceChanged））；
资源上的私有静态无效已更改（DependencyObject d、DependencyPropertyChangedEventArgs e）
{
（d为CheckBoxCustomBindingBehavior）.ModifyBinding（）；
}
公共字符串路径
{
得到
{
返回（字符串）GetValue（路径属性）；
}
设置
{
SetValue（路径属性，值）；
}
}
//使用DependencyProperty作为路径的后备存储。这将启用动画、样式、绑定等。。。
公共静态只读DependencyProperty PathProperty=
Register（“Path”、typeof（string）、typeof（CheckBoxCustomBindingBehavior）、newpropertyMetadata（string.Empty、OnPathChanged））；
私有静态void OnPathChanged（DependencyObject d、DependencyPropertyChangedEventArgs e）
{
（d为CheckBoxCustomBindingBehavior）.ModifyBinding（）；
}
私有void ModifyBinding（）
{
var source=source？？AssociatedObject.DataContext；
if（source！=null&！string.IsNullOrEmpty（Path））
{
绑定b=新绑定（路径）；
b、 来源=来源；
AssociatedObject.SetBinding（CheckBox.IsCheckedProperty，b）；
}
}
}

以及Xaml的使用

 <CheckBox xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity">
        <i:Interaction.Behaviors>
            <local:CheckBoxCustomBindingBehavior Path="{Binding SelectedPath}" Source="{Binding}" />
        </i:Interaction.Behaviors>
    </CheckBox>



SelectedPath来自model，这就是我存储属性名的地方

注意：您将需要交互式程序集。
编译时必须知道源属性的名称，才能在XAML中设置绑定：

<CheckBox Content="{Binding Caption}">
    <CheckBox.IsChecked>
        <Binding Path="Source.Property" />
    </CheckBox.IsChecked>
</CheckBox>

但是，在纯XAML中无法做到这一点。请记住，XAML是一种标记语言。
在看到@WPFUser one之后，回答有点晚，但它支持任何属性，我个人不喜欢混合依赖项：

public class DynamicBinding
{
    public static object GetSource(DependencyObject obj) => (object)obj.GetValue(SourceProperty);
    public static void SetSource(DependencyObject obj, object value) => obj.SetValue(SourceProperty, value);
    public static readonly DependencyProperty SourceProperty =
        DependencyProperty.RegisterAttached("Source", typeof(object), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    public static string GetProperty(DependencyObject obj) => (string)obj.GetValue(PropertyProperty);
    public static void SetProperty(DependencyObject obj, string value) => obj.SetValue(PropertyProperty, value);
    public static readonly DependencyProperty PropertyProperty =
        DependencyProperty.RegisterAttached("Property", typeof(string), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    public static string GetTarget(DependencyObject obj) => (string)obj.GetValue(TargetProperty);
    public static void SetTarget(DependencyObject obj, string value) => obj.SetValue(TargetProperty, value);
    public static readonly DependencyProperty TargetProperty =
        DependencyProperty.RegisterAttached("Target", typeof(string), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    static void SetBinding(DependencyObject obj)
    {
        var source = GetSource(obj);
        var property = GetProperty(obj);
        var target = GetTarget(obj);
        // only if all required attached properties values are set
        if (source == null || property == null || target == null)
            return;
        BindingOperations.SetBinding(obj, DependencyPropertyDescriptor.FromName(target, obj.GetType(), obj.GetType()).DependencyProperty,
            new Binding(property) { Source = source });
    }
}

用法是：

<CheckBox Content="{Binding Caption}"
          local:DynamicBinding.Property="{Binding PropertyName}"
          local:DynamicBinding.Source="{Binding Source}"
          local:DynamicBinding.Target="IsChecked" />



Target
可以是控件的任何依赖属性。它是作为一个普通字符串给出的，我不确定如何改进它，以便在输入它时获得intellisense帮助

ToDo:如果更改了
目标
（它将反映对
源
或
属性
所做的更改），则不会删除绑定，不支持多个动态绑定（例如，对控件的不同属性）。
回答不错，它将支持MVVM。只是澄清一下；在视图的代码隐藏中创建与视图模型属性的绑定不会破坏MVVM模式。MVVM是关于分离关注点，而不是从视图中删除代码。代码隐藏类与XAML标记是同一视图的一部分。@mm8，您的答案是可以的，我一直在使用它作为解决方案。然而，当您开始广泛使用数据模板时（我的问题的原因），这段代码会产生巨大的问题。将其隐藏到可重用行为中可以让您纯粹在xaml（例如资源字典）中定义模板。行为是更好的选择，因为它允许以动态方式在一个元素上绑定多个属性。DP DynamicBinding.Target只能设置一次。但考虑到附加属性的想法，下一个想法将是创建这些属性。然后，
IsChecked
属性由唯一命名的附加属性
dynamicBindingtSourceChecked
，
DynamicBindingPropertyIsChecked
和
dynamicBindingTargetChecked
处理。
public class DynamicBinding
{
    public static object GetSource(DependencyObject obj) => (object)obj.GetValue(SourceProperty);
    public static void SetSource(DependencyObject obj, object value) => obj.SetValue(SourceProperty, value);
    public static readonly DependencyProperty SourceProperty =
        DependencyProperty.RegisterAttached("Source", typeof(object), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    public static string GetProperty(DependencyObject obj) => (string)obj.GetValue(PropertyProperty);
    public static void SetProperty(DependencyObject obj, string value) => obj.SetValue(PropertyProperty, value);
    public static readonly DependencyProperty PropertyProperty =
        DependencyProperty.RegisterAttached("Property", typeof(string), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    public static string GetTarget(DependencyObject obj) => (string)obj.GetValue(TargetProperty);
    public static void SetTarget(DependencyObject obj, string value) => obj.SetValue(TargetProperty, value);
    public static readonly DependencyProperty TargetProperty =
        DependencyProperty.RegisterAttached("Target", typeof(string), typeof(DynamicBinding), new PropertyMetadata(null, (d, e) => SetBinding(d)));

    static void SetBinding(DependencyObject obj)
    {
        var source = GetSource(obj);
        var property = GetProperty(obj);
        var target = GetTarget(obj);
        // only if all required attached properties values are set
        if (source == null || property == null || target == null)
            return;
        BindingOperations.SetBinding(obj, DependencyPropertyDescriptor.FromName(target, obj.GetType(), obj.GetType()).DependencyProperty,
            new Binding(property) { Source = source });
    }
}

<CheckBox Content="{Binding Caption}"
          local:DynamicBinding.Property="{Binding PropertyName}"
          local:DynamicBinding.Source="{Binding Source}"
          local:DynamicBinding.Target="IsChecked" />