OneWayToSource绑定重置目标值 [英] OneWayToSource binding resetting target value

问题描述

为什么OneWayToSource绑定会重置我的目标值? 这是绑定代码:

Why is the OneWayToSource binding resetting my target value? Here is the binding code:

SolidColorBrush brush = GetTemplateChild("PART_PreviewBrush") as SolidColorBrush;
            if (brush != null)
            {
                Binding binding = new Binding("Color");
                binding.Source = brush;
                binding.Mode = BindingMode.OneWayToSource;
                this.SetBinding(ColorPicker.ColorProperty, binding);
            }

我在xaml中设置颜色"依赖项属性.但是它会被绑定覆盖.之后，绑定就可以了. 因此，本质上我的问题是:我无法给"Color"属性指定起始值，因为它会被绑定覆盖.

I set the "Color" dependency property in xaml. But it gets overwritten by the binding. After that the binding works ok. So, essentially my problem is: I can't give a starting value to the "Color" property because it gets overwritten by the binding.

我做了一个解决该问题的方法，但是仍然不明白为什么OneWayToSource会这样:

I made a workaround that solves the problem, but still don't understand why OneWayToSource behaves like that:

System.Windows.Media.Color CurrentColor = this.Color;
                this.SetBinding(ColorPicker.ColorProperty, binding);
                this.Color = CurrentColor;

找到了可能的解决方案: 我必须设置:

Found a possible solution: I have to set:

binding.FallbackValue = this.Color;

推荐答案

您可以使用

You could use the BindingOperations class to set the binding:

BindingOperations.SetBinding(
    brush, SolidColorBrush.ColorProperty, new Binding("Color") { Source = this });

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