问题描述
问题:在以下代码的 btnRevert_Click(...)
事件中,我们如何使 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(...)
事件成功地从 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”来测试该场景,并注意到上述来回场景工作正常,只是 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;
}
解决方法
FlowDocumentReader
提供查看流内容的控件(不支持编辑)。
btnRevert_Click()
方法中的以下几行,来自上面的问题,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FlowDocument
控件中的FlowDocumentReader
不支持编辑,从FlowDocumentReader
控件中获取文档进行编辑的最简单方法是克隆它,如下所示:
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;
}