如何强制刷新绑定 [英] How to force a refresh of binding

问题描述

亲爱的，

我在列表框中有一个组件，其高度绑定到另一个控件高度，该高度托管在设置为自动的网格行中

I have a component in a listbox where its Height is bind to an other control Height which is hosted in a grid row set to Auto 

myControl.Height="{Binding ElementName=_mainChart,Path=ActualHeight}"

在我的viewmodel中，我需要通过代码更改名为_mainChart的控件的高度值

In my viewmodel, I need to change the Height value of my control named _mainChart through code

最初_mainChart.ActualHeigth = 200

Initially _mainChart.ActualHeigth=200

然后当我把它改成代码时，我做的就是 下面：

Then when I change it to code, I do is as  below :

	_mainchart.Width = 200;
	_mainchart.Height = 400;
	_mainchart.UpdateLayout();

然后我对这个新大小做一些操作然后重新设置它：

Then I do some operation on this new size and then reset it back :

_mainchart.Width = double.Nan;
	_mainchart.Height = double.Nan;
	_mainchart.UpdateLayout();

在此阶段，_ mainChart.Height已更改回来，但myControl.Height不再正确绑定到_mainChart的ActualHeight

At this stage, _mainChart.Height has change back but the myControl.Height is not anymore bind correctly to ActualHeight of _mainChart

如何强制刷新  myControl.Height =" {Binding ElementName = _mainChart，Path = ActualHeight }"，它是为了再次获得正确的价值？

How can I force a refresh of myControl.Height="{Binding ElementName=_mainChart,Path=ActualHeight}", it order to gets correct value again ?

寻求帮助

推荐答案

如果你设置了一个属性代码绑定时你会破坏绑定。

If you set a property in code while it is bound you will destroy the binding.

这与你刚才提出的问题几乎相同。 你应该永远不需要UpdateLayout，所以你的XAML会阻止你。  （提示显示它真的可以帮助我们）。

This is pretty much the same question you asked a while ago.  You should never need UpdateLayout so it something about your XAML that is stopping you.  (Hint showing it would really help us help you).

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