C# 如何以编程方式刷新组合框的 itemssource 的绑定？
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How to refresh a binding of the itemssource of a combobox programmatically?
提问by Natrium
I found some items regarding this questions on SO, but they do not satisfy me. They talk about INotifyProperyChanged, but that does not help in my case.
我在 SO 上找到了一些关于这个问题的项目，但它们并不让我满意。他们谈论 INotifyProperyChanged，但这对我来说无济于事。
I have a Combobox.
For the ItemsSource, I use a MultiBindingand a Converterto create an ICollectionView. The ICollectionViewgets bound to the ItemsSource.
我有一个Combobox. 对于ItemsSource，我使用 aMultiBinding和 aConverter创建一个ICollectionView. 在ICollectionView被绑定到ItemsSource。
On the GotFocus-event, this binding needs to be refreshed, so the converter gets fired again.
在GotFocus-event 上，需要刷新此绑定，因此转换器再次被触发。
How can I do this?
我怎样才能做到这一点？
采纳答案by Natrium
Ok, a collegue helped me out.
好的，一位同事帮我解决了。
This is the solution:
这是解决方案：
private void theComboBox_OnGotFocus(object sender, RoutedEventArgs e)
{
ComboBox theComboBox = sender as ComboBox;
if (theComboBox != null)
{
MultiBindingExpression binding = BindingOperations.GetMultiBindingExpression(theComboBox, ComboBox.ItemsSourceProperty);
if (binding != null)
{
binding.UpdateTarget();
}
}
}
