断开控件与BlockUIContainer的连接

2024-05-20 • 问答

我需要在FlowDocument中临时显示一些UIElement。我将其封装在BlockUIContainer中，但是当不再需要它时，我看不到如何将其与BlockUICOntainer断开连接。没有删除方法。下面的代码显示-它以异常结尾

System.InvalidOperationException：'指定的元素已经是另一个元素的逻辑子级。首先断开连接。'

例如

<Grid x:Name="Grid1">
  <RichTextBox x:Name="rtb"/>
</Grid>

public MainWindow() {
    InitializeComponent();

    Loaded += MainWindow_Loaded;
}

private void MainWindow_Loaded(object sender,RoutedEventArgs e) {
    var c2 = new WrapPanel();
    // Imagine adding lots of controls into c2 ...
    rtb.Document.Blocks.Add(new BlockUIContainer(c2));

    var bc = (BlockUIContainer)c2.Parent;
    ((FlowDocument)(bc).Parent).Blocks.Remove(bc);

    Grid1.Children.Add(c2); // Exception. Here I want to move that c2 elsewhere in logical tree but I don't know how to disconnect it
        }

好的，我可以重新创建c2，但这不是很好。或者我看到我可以调用内部RemoveLogicalChild，但这似乎也很hacky。 WPF期望这样做如何？

谢谢

var c2 = new WrapPanel(); rtb.Document.Blocks.Add(new BlockUIContainer(c2)); var bc = (BlockUIContainer) c2.Parent; rtb.Document.Blocks.Remove(bc); // Remove parent association bc.Child = null; // Update the subtree/template association c2.UpdateLayout(); Grid1.Children.Add(c2);

断开控件与BlockUIContainer的连接

iCMS 回答：断开控件与BlockUIContainer的连接

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