应该绑定到Path.Data属性吗？ [英] Should binding to Path.Data property work?

问题描述

编辑：注意！这原来是我的代码中的打字错误

根据msdn ，Path.Data似乎是可绑定的。但我不知道如何阅读msdn页面的Depenency Property Information部分。 AffectsRender和AffectsMeasure是否足以使用？

According to msdn , Path.Data appears to be bindable. But I am not sure how to read the Depenedency Property Information part of the msdn page. Is AffectsRender and AffectsMeasure be enough for my use?

如果我使用x：Name来直接分配，几何出现

If I use x:Name to directly assign it, the geometry appears

var curve = new GeometryGroup();
curve.Children.Add(new LineGeometry(new Point(0, 0), new Point(20, 20)));
curve.Children.Add(new LineGeometry(new Point(0, 20), new Point(20, 0)));
CurveGraph.Data = curve;

这很好。绘制一个不错的X。

This works fine. Draws a nice "X".

但是，如果在ViewModel中有一个类型为GeometryGroup的依赖属性

However, if I have a dependency property of type GeometryGroup in the ViewModel

var curve = new GeometryGroup();
curve.Children.Add(new LineGeometry(new Point(0, 0), new Point(20, 20)));
curve.Children.Add(new LineGeometry(new Point(0, 20), new Point(20, 0)));
GeometryData= curve;

dp：

public GeometryGroup GeometryData
    {
        get { return (GeometryGroup)GetValue(GeometryDataProperty); }
        set { SetValue(GeometryDataProperty, value); }
    }

    public static readonly DependencyProperty GeometryDataProperty =  DependencyProperty.Register("GeometryDataProperty", typeof(GeometryGroup), typeof(MiniTrendVm), new UIPropertyMetadata(new GeometryGroup()));

...然后它没有工作。什么都没发生。没有X。

...then it didn't work. Nothing happens. No "X".

xaml：

<Path Data="{Binding GeometryData}" x:Name="CurveGraph" Stroke = "{Binding StrokeColor}" StrokeThickness = "2" Grid.RowSpan="4"/> 

应该这个工作吗？我胖胖了吗？还是不能以这种方式设置Data属性？在这两种情况下，刷子都是数据绑定的，所以我知道数据文本正确设置。

Should this work? Have I fat fingered something? Or can't the Data property be set this way? The brush was databound in both cases, so I know that the datacontext is correctly set.

推荐答案

您的 DependencyProperty 注册为GeometryDataProperty，应为GeometryData。不太确定这是否真的打破了绑定。 编辑：H.B.最近的测试显示这可能是事实。绑定该属性是可能的。

Your DependencyProperty is registered as "GeometryDataProperty" which should be "GeometryData". Not quite sure if this actually breaks the binding. Recent tests by H.B. reveal that this probably is indeed the cause. Binding that property is possible.

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