为什么我的 FlowDocument 不使用整个宽度？

Question

我正在将 HTML 转换为 XAML 并使用 FlowDocumentScrollViewer 将其加载到 StackPanel 中。内容从 HTML 中正确呈现。我的问题是内容或 FlowDocument 似乎没有使用整个宽度。

html 到 xaml 的转换看起来像这个

<FlowDocument xml:space="preserve" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<Paragraph>Central Contractor Registration Is Free It Shouldn't Cost You A Dime </Paragraph>
<Paragraph>Central Contractor Registration is free. The federal government does not charge a fee to register your business in the central contractor registration database. I am telling you that central contractor registration is free because there is some confusion out there and I want to [...]  </Paragraph>
</FlowDocument>

Dim conversionhtml As String = "<FlowDocument xml:space=""preserve"" xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""><Paragraph>Central Contractor Registration Is Free It Shouldn't Cost You A Dime </Paragraph><Paragraph>Central Contractor Registration is free. The federal government does not charge a fee to register your business in the central contractor registration database. I am telling you that central contractor registration is free because there is some confusion out there and I want to [...]</Paragraph></FlowDocument>"
Dim fd As FlowDocument = DirectCast(Markup.XamlReader.Parse(conversionhtml), FlowDocument)
Dim fdr As New FlowDocumentScrollViewer()
fdr.Document = fd
FeedsDisplay.Children.Add(fdr)

feedsdisplay 是一个普通的堆栈面板。问题是 flowdocumentscrollviewer 使用整个宽度，但看起来 flow document 仅使用大约 40 %

我忽略了什么？提前致谢！

Answer 1

我发现了这个问题。我的 xaml 中有一个带有堆栈面板的文档滚动查看器，因此它无法正确重新生成。我删除了这个并解决了问题。