在后台代码中设置模板绑定

本文关键字：绑定 设置 后台 代码 | 更新日期: 2023-09-27 18:15:33

我期望的输出是这样的，

<Canvas Width="800" Height="600">
   <Ellipse Stroke="#FF000000" StrokeThickness="2" Width="284" Height="288" 
            ToolTip="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=Min}" 
            Canvas.Left="312" Canvas.Top="122" />
</Canvas>

在这个代码中，

//This will ultimately hold object of type UIElement, which is Ellipse in this case.
private DependencyObject selectedObject; 
public void AddBinding(DependencyProperty dependencyProperty, DependencyProperty ipartProperty)
{
    Binding binding = new Binding(ipartProperty.Name); //Here Name is Min, an attached property
    binding.RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent);
    BindingOperations.SetBinding(selectedObject, dependencyProperty, binding);
}

但实际输出是

<Canvas Width="800" Height="600">
   <Ellipse Stroke="#FF000000" StrokeThickness="2" Width="284" Height="288" 
            ToolTip="{x:Null}" Canvas.Left="312" Canvas.Top="122"/>
</Canvas>

我不知道怎么了，谁来帮帮我

在后台代码中设置模板绑定

找到答案了。使用下面的类

public class BindingConverter : ExpressionConverter
{
    public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, Type destinationType)
    {
        return true;
    }
    public override object ConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
    {
        if (destinationType == typeof(MarkupExtension))
        {
            BindingExpression bindingExpression = value as BindingExpression;
            if (bindingExpression == null)
            {
                throw new FormatException("Expected binding, but didn't get one");
            }
            return bindingExpression.ParentBinding;
        }
        return base.ConvertTo(context, culture, value, destinationType);
    }
}

将此方法添加到调用XamlWriter.Save(obj)的类

private void Register()
    {
        Attribute[] attr = new Attribute[1];
        TypeConverterAttribute vConv = new TypeConverterAttribute(typeof(BindingConverter));
        attr[0] = vConv;
        TypeDescriptor.AddAttributes(typeof(BindingExpression), attr);
    }

得到了我想要的答案!!这要归功于Alex Dov http://www.codeproject.com/script/Membership/View.aspx?mid=106815。非常感谢这个家伙

什么输出?

如果你正在使用某种XamlWriter，你应该注意它的局限性，它们不保留绑定，如果你的意思是这是属性的值，也有意义，因为你不能绑定到附加的属性，你需要这个路径:(OwndingClass.AttachedProperty) (注意括号和拥有的类前缀)

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