blocks|key|929914|text|您可以使用绑定表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|929915|private+void+ComboBox_Loaded(object+sender,+RoutedEventArgs+e)
{
++++((ComboBox)sender).GetBindingExpression(ComboBox.ItemsSourceProperty)
++++++++++++++++++++++.UpdateTarget();
}|code-block|syntax|javascript|929916|但是，您也可以触发更改通知，而且，如果您的集合实现了INotifyCollectionChanged+(例如，在ObservableCollection<T>中实现)，它将同步，因此您不需要执行任何这些操作。|offset|length|style|CODE|929917|entityMap^0|0|0|Q|O|1K|N|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

You can use binding expressions:

<pre><code>private void ComboBox_Loaded(object sender, RoutedEventArgs e)
{
 ((ComboBox)sender).GetBindingExpression(ComboBox.ItemsSourceProperty)
 .UpdateTarget();
}
</code></pre>

But <a href="https://stackoverflow.com/a/5676612/546730">as Blindmeis noted</a> you can also fire change notifications, further if your collection implements <code>INotifyCollectionChanged</code> (for example implemented in the <code>ObservableCollection&lt;T&gt;</code>) it will synchronize so you do not need to do any of this.

blocks|key|714035|text|尝试使用BindingExpression.UpdateTarget()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|714036|entityMap^0|4|W|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Try using <code>BindingExpression.UpdateTarget()</code>

blocks|key|929982|text|如果您使用mvvm，并且您的项目源位于您的vm中。当你想刷新时，只需为你的集合属性调用INotifyPropertyChanged即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|929983|OnPropertyChanged("YourCollectionProperty");|code-block|syntax|javascript|929984|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

if you use mvvm and your itemssource is located in your vm. just call INotifyPropertyChanged for your collection property when you want to refresh.

<pre><code>OnPropertyChanged("YourCollectionProperty");
</code></pre>

blocks|key|930043|text|另外，如果您想用控件的新值更新数据源，则需要调用UpdateSource()而不是UpdateTarget()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|930044|((TextBox)sender).GetBindingExpression(TextBox.TextProperty).UpdateSource();|code-block|syntax|javascript|930045|entityMap^0|O|E|15|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

To add my 2 cents, if you want to update your data source with the new value of your Control, you need to call <code>UpdateSource()</code> instead of <code>UpdateTarget()</code>:
<pre><code>((TextBox)sender).GetBindingExpression(TextBox.TextProperty).UpdateSource();
</code></pre>

blocks|key|930094|text|MultiBinding友好版本...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|930095|private+void+ComboBox_Loaded(object+sender,+RoutedEventArgs+e)
{
++++BindingOperations.GetBindingExpressionBase((ComboBox)sender,+ComboBox.ItemsSourceProperty).UpdateTarget();
}|code-block|syntax|javascript|930096|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

MultiBinding friendly version...

<pre><code>private void ComboBox_Loaded(object sender, RoutedEventArgs e)
{
 BindingOperations.GetBindingExpressionBase((ComboBox)sender, ComboBox.ItemsSourceProperty).UpdateTarget();
}
</code></pre>

blocks|key|714254|text|我从后端获取数据，只用一行代码更新了屏幕。啊，真灵。不确定，为什么我们需要实现接口。(windows+10、UWP)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|714255|++++private+void+populateInCurrentScreen()
++++{
++++++++(this.FindName("Dets")+as+Grid).Visibility+=+Visibility.Visible;
++++++++this.Bindings.Update();
++++}|code-block|syntax|javascript|714256|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I was fetching data from backend and updated the screen with just one line of code. It worked. Not sure, why we need to implement Interface. (windows 10, UWP)

<pre><code> private void populateInCurrentScreen()
 {
 (this.FindName("Dets") as Grid).Visibility = Visibility.Visible;
 this.Bindings.Update();
 }
</code></pre>

I have got a combo box with items source attached using simple binding. Is there any way to refresh this binding once combo box is loaded?

How to force a WPF binding to refresh?

我有一个组合框与项目的来源附加使用简单的绑定。加载组合框后，有没有办法刷新这个绑定？

问如何强制WPF绑定刷新？
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