c# – 如何在没有Name或x：Name的情况下绑定到控件？

在没有定义名称的情况下我可以想到的其他方法是绑定类似下面的内容(绑定到父级和索引器以获取目标子级).

但这与您的逻辑树结构紧密耦合 –

<StackPanel>
        <TextBlock Text="Test"/>
        <TextBlock Text="{Binding Parent.Children[0].Text,RelativeSource={RelativeSource Mode=Self}}"/>
    </StackPanel>

此外,这可以使用IValueConverter来实现.正如您所提到的,在父容器中只有一个这种类型的元素,您可以将父级传递给转换器,转换器将使用VisualTreeHelper类遍历子级.

<StackPanel>
        <TextBlock Text="Test"/>
        <TextBlock Text="{Binding Parent,RelativeSource={RelativeSource Self},Converter={StaticResource MyConverter}}"/>
     </StackPanel>

这是您的转换器代码 –

public class MyConverter: IValueConverter
{
    public object Convert(object value,Type targetType,object parameter,System.Globalization.CultureInfo culture)
    {
        if (value is DependencyObject) 
        {
            var textBlock = FindChild<TextBlock>((DependencyObject)value,null);
            return (textBlock == null)?string.Empty:textBlock.Text;
        }
        else
            return String.Empty;
    }

    public object ConvertBack(object value,System.Globalization.CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}

这是使用VisualTreeHelper遍历的方法.我把这个方法放在我的Utility类中,在很多情况下都很方便 –

public static T FindChild<T>(DependencyObject parent,string childName)
       where T : DependencyObject
    {
        // Confirm parent is valid.  
        if (parent == null) return null;

        T foundChild = null;

        int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent,i);
            // If the child is not of the request child type child 
            T childType = child as T;
            if (childType == null)
            {
                // recursively drill down the tree 
                foundChild = FindChild<T>(child,childName);

                // If the child is found,break so we do not
                // overwrite the found child.  
                if (foundChild != null) break;
            }
            else if (!string.IsNullOrEmpty(childName))
            {
                var frameworkElement = child as FrameworkElement;
                // If the child's name is set for search 
                if (frameworkElement != null
                    && frameworkElement.Name == childName)
                {
                    // if the child's name is of the request name 
                    foundChild = (T)child;
                    break;
                }
            }
            else
            {
                // child element found. 
                foundChild = (T)child;
                break;
            }
        }

        return foundChild;
    }