RichTextBox 在将其绑定到 FlowDocumentReader 内部的内容时变为 ReadOnly

Question

问题：在下面代码的btnRevert_Click(...)事件中，如何让RichTextBox可编辑？

在我的 WPF .NET5 应用程序中，btnTest_Click(...) 事件成功地将 RichTextBox 的内容显示到 FlowDocumentReader (fdReader) 中。然后 btnRevert_Click(...) 事件成功从 fdReader 取回内容并将其显示回 RichTextBox，但它使 RichTextBox ReadOnly.

我通过在 RichTextBox 中输入简单文本“This is a test”来测试场景，并注意到上述来回场景工作正常，除了 btnRevert_Click(...) 事件使文本“This is a test " 只读。

MainWindow.xaml:

<Window x:Class="Wpf_RTBFlowDocTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Wpf_RTBFlowDocTest"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <DockPanel Name="mainPanel">
            <ToolBar Name="mainToolBar" Height="30" DockPanel.Dock="Top">
                <Button x:Name="btnTest" Content="Test" Click="btnTest_Click"/>
                <Button x:Name="btnRevert" Content="Revert" Click="btnRevert_Click"/>
            </ToolBar>
            <RichTextBox Name="rtbTest" AcceptsTab="True"></RichTextBox>
            <FlowDocumentReader x:Name="fdReader" Visibility="Collapsed">
                <FlowDocument>
                    <Paragraph>Text inside paragraph.</Paragraph>
                </FlowDocument>
            </FlowDocumentReader>
        </DockPanel>
    </Grid>
</Window>

MainWindow.xaml.cs:

private void btnTest_Click(object sender, RoutedEventArgs e)
{
    FlowDocument RTBflowDoc = rtbTest.Document;
    rtbTest.Visibility = Visibility.Collapsed;
    rtbTest.Document = new FlowDocument();
    fdReader.Document = RTBflowDoc;
    fdReader.Visibility = Visibility.Visible;
}

private void btnRevert_Click(object sender, RoutedEventArgs e)
{
    FlowDocument fdReaderFlowDoc = fdReader.Document;
    fdReader.Document = new FlowDocument();
    rtbTest.IsReadOnly = false;
    rtbTest.Document = fdReaderFlowDoc;
    rtbTest.Visibility = Visibility.Visible;
}

Answer 1

FlowDocumentReader提供了查看流内容的控件（不支持编辑）。

btnRevert_Click()方法中的以下几行，从上面的问题中，只需将rtbTest.Document设置为fdReader.Document：

FlowDocument fdReaderFlowDoc = fdReader.Document;
fdReader.Document = new FlowDocument();  
rtbTest.Document = fdReaderFlowDoc;

但是由于FlowDocumentReader控件中的FlowDocument不支持编辑，所以从FlowDocumentReader控件中获取文档进行编辑最简单的方法是如下克隆它:

private void btnRevert_Click(object sender, RoutedEventArgs e)
{   
    var range = new TextRange(fdReader.Document.ContentStart, fdReader.Document.ContentEnd);
    if (!range.IsEmpty)
    {
        using (var stream = new MemoryStream())
        {
            range.Save(stream, DataFormats.XamlPackage);
            var copyto = new TextRange(rtbTest.Document.ContentEnd, rtbTest.Document.ContentEnd);
            copyto.Load(stream, DataFormats.XamlPackage);
        }
    }
    rtbTest.Visibility = Visibility.Visible;
    fdReader.Visibility = Visibility.Collapsed;
}

RichTextBox 在将其绑定到 FlowDocumentReader 内部的内容时变为 ReadOnly

RichTextBox becomes ReadOnly when binding it to content from inside FlowDocumentReader

c#

wpf

richtextbox

flowdocument

flowdocumentreader