问题描述
我想，这样的值在视图模型可用来控制我的看法模型的只读属性绑定。
I want to bind a read-only property of a control to my view model so that the value is available in the view model.
什么是最好的方式这样做呢？
What is the best way of doing this?
例如我想 ActualWidth的绑定到我的视图模型的属性。宽度值是通过使用WPF的布局逻辑，所以我不能产生在我看来，这种模式的价值和它推到控件属性生成的，通常的做法是这样的。相反，我需要有WPF产生的价值，并将其推到视图模型。
For example I'd like to bind ActualWidth to a property in my view model. The width value is generated by WPF using its layout logic so I can't generate this value in my view model and push it to the control property, as would normally be the case. Instead I need to have WPF generate the value and push it to the view model.
我只想用模式= OneWayToSource ，但这并不为只读属性工作：
I would just use Mode=OneWayToSource, but this doesn't work for read-only properties:
<Border
...
ActualWidth="{Binding MyDataModelWidth, Mode=OneWayToSource}"
>
... child controls ...
</Border>
我目前在做它的方式是处理时，SizeChanged 的边框和隐藏代码插入值到视图模式，但这并不手感相当不错。
The way I am doing it currently is to handle SizeChanged for the border and the code-behind plugs the value into the view model, but this doesn't feel quite right.
有没有人已经解决了这个问题？
Has anyone already solved this problem?
更新：
我的问题实际上是这其中的一个副本：
的
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