WPF 错误:RichTextBox 中的 TextRange.GetPropertyValue [英] WPF bug: TextRange.GetPropertyValue in RichTextBox

问题描述

我必须在 WPF RichtTextBox 中检索所选文本的 Foreground 属性，但我认为 TextRange.GetPropertyValue 函数中存在错误.我编写了一个简单的应用程序来测试错误:

I have to retrieve the Foreground property of the selected text in a WPF RichtTextBox, but I think, there is a bug in the TextRange.GetPropertyValue function. I've written a simple application to test the error:

   <RichTextBox x:Name="rtfBox">
        <RichTextBox.Document>
            <FlowDocument>
                <Paragraph>
                    <Run>run run run</Run>
                    <Hyperlink TargetName="http://stackoverflow.com">stackoverflow.com</Hyperlink>
                </Paragraph>
            </FlowDocument>
        </RichTextBox.Document>
    </RichTextBox>
    <Button Content="Click!" Height="28" Click="Button_Click" />

在后面的代码中:

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        var textrange = new TextRange(rtfBox.Selection.Start, rtfBox.Selection.End);
        var propertyValue = textrange.GetPropertyValue(TextElement.ForegroundProperty);
        MessageBox.Show(propertyValue.ToString());
    }

当我选择 stackoverflow 超链接的前几个字符时，MessageBox 说 Foreground 属性是一个 DependencyProperty.UnsetValue，但是当我选择链接的其他部分时，它显示了真正的前景色.

When I select the first few characters of the stackoverflow hyperlink, the MessageBox says that the Foreground property is a DependencyProperty.UnsetValue, but when I select other parts of the link, it shows the true foreground color.

它看起来像一个错误.

是否有解决此问题的方法?

Are there any workaround for this problem?

推荐答案

这是因为 TextElement.ForegroundProperty.如果将其更改为Hyperlink.ForegroundProperty，它将显示真实值.

It's because of the TextElement.ForegroundProperty. If you change it to Hyperlink.ForegroundProperty, it will show the true value.

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