在DataTemplate中的RotateTransform Angle上的绑定未生效 [英] Binding on RotateTransform Angle in DataTemplate not taking effect

问题描述

在我的WPF UserControl中，我有此资源，请注意Xml示例中的注释。

In my WPF UserControl I have this resource, please observe the comments in the Xml sample.

<UserControl.Resources>
    <DataTemplate x:Key="AxisXLabelTemplate">
        <ContentPresenter Content="{Binding Path=Content}">
            <ContentPresenter.LayoutTransform>
                <RotateTransform Angle="{Binding XAxisLabelRotation, UpdateSourceTrigger=PropertyChanged}" /> <!-- This does not work -->
                <!-- <RotateTransform Angle="-90" /> This works -->
            </ContentPresenter.LayoutTransform>
        </ContentPresenter>
    </DataTemplate>
</UserControl.Resources>

在代码中，我有一个依赖项属性，定义如下：

In the code I have a dependency property defined as follows:

class MyChart: INotifyPropertyChanged
{
        public static readonly DependencyProperty XAxisLabelRotationProperty =
            DependencyProperty.Register("XAxisLabelRotation", typeof(RotateTransform), typeof(BarChart),
                new FrameworkPropertyMetadata((RotateTransform)new RotateTransform(-90.0)));

        public RotateTransform XAxisLabelRotation
        {
            get { return (RotateTransform)GetValue(XAxisLabelRotationProperty); }
            set { SetValue(XAxisLabelRotationProperty, value); }
        }
...
}

AxisXLabelTemplate DataTemplate

The AxisXLabelTemplate DataTemplate is assigned to an element farther below as follows:

<chart:AxisLabel ElementTemplate="{StaticResource AxisXLabelTemplate}"/>

问题是，当我使用Angle的未绑定值并将其硬编码为-90时，它工作得很漂亮，当我尝试使用XAxisLabelRotation的绑定值时，它却没有。

The problem is that when I use the unbound value for Angle and hard-code it to -90, it works beautifully, and when I try with the bound value to XAxisLabelRotation it doesn't.

有人可以帮忙吗？

推荐答案

我重新创建了与您，它对我也不起作用。奇怪的是，没有绑定错误。我也做了relativesource绑定，但是没有用。

I recreated similar setting as you and it did not work for me either. Curiously there are no binding errors. I did relativesource binding too and it didnt work.

虽然我绑定了工具提示

  <ContentPresenter ToolTip="{Binding XAxisLabelRotation, 
                                      RelativeSource={RelativeSource
                                          AncestorType={x:Type ContentControl}},
                                             UpdateSourceTrigger=PropertyChanged}" ..>

向我显示了工具提示。因此，我更改了旋转变换，

shows the tooltip to me. So I changed the rotate transform,

  <RotateTransform Angle="{Binding XAxisLabelRotation, 
                                      RelativeSource={RelativeSource
                                          AncestorType={x:Type ContentControl}},
                                             UpdateSourceTrigger=PropertyChanged}" ..>

但该转换仍然无效。仍然没有绑定错误。

But still the transform did not work. Still no binding errors.

然后我引入了一个虚拟转换器...

Then I introduced a dummy converter ...

public class AngleConverter : IValueConverter
{
    public object Convert(...)
    {
        return value;
    }
    ....
}

<RotateTransform Angle="{Binding XAxisLabelRotation, 
                                 RelativeSource={RelativeSource
                                      AncestorType={x:Type ContentControl}},
                                 UpdateSourceTrigger=PropertyChanged,
                                 Converter={StaticResource AngleConverter}}" ..>

它奇迹般地起作用！！！

and it worked miraculously!!!

WPF无法解释的世界？

Unexplanable world of WPF???

这篇关于在DataTemplate中的RotateTransform Angle上的绑定未生效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！