如何在不丢失格式的情况下以编程方式替换 WFP RichTextBox 的某些内容? [英] How to programmatically replace some content of WFP RichTextBox without loosing the formatting?

问题描述

问题:我们如何以编程方式替换 WPF RichTextBox 中的某些文本而不丢失其格式?在下面的代码中，我显然没有做正确的事情.我的在线搜索提供了一些相关建议，但他们似乎正在使用 Winform，其中 RichTextBox 具有 rtf 属性 - 例如

用 rstu 替换 abcd 后 RichTextBox 的屏幕截图:

我们可以看到格式丢失了.下面显示的列表并不是真正的格式化编号列表，它可能只是未格式化的文本(例如 1.Item 1 等)

解决方案

它正在丢失格式，因为您将 RTF 存储到字符串中，而该字符串不保留 RTF 格式.

您可以将其保存如下，

TextRange textRange = new TextRange(rtbTest.Document.ContentStart, rtbTest.Document.ContentEnd);字符串 rtf;使用 (var memoryStream = new MemoryStream()){textRange.Save(memoryStream, DataFormats.Rtf);rtf = ASCIIEncoding.Default.GetString(memoryStream.ToArray());}rtf = rtf.Replace("abcd", "rstu");MemoryStream stream = new MemoryStream(ASCIIEncoding.Default.GetBytes(rtf));rtbTest.SelectAll();rtbTest.Selection.Load(stream, DataFormats.Rtf);

Question: How can we programmatically replace some text in a WPF RichTextBox without loosing its formatting? In the following code I am clearly not doing something right. My online search gives some relevant suggestions but they seem to be using Winform where RichTextBox has rtf property - such as this one.

Following code correctly replaces text abcd with rstu inside a WPF RichTexBox but it looses the formatting of the RichTextBox as shown in the two images below:

//rtbTest is the name of the RichTextBox
TextRange textRange = new TextRange(rtbTest.Document.ContentStart, rtbTest.Document.ContentEnd);
string oldText = textRange.Text;
string newText = oldText.Replace("abcd", "rstu");
textRange.Text = newText;

Screenshot of RichTextBox BEFORE replacing abcd with rstu:

Screenshot of RichTextBox AFTER replacing abcd with rstu:

As we can see the formatting is lost. The list shown below is not really a formatted numbered list, it probably is just unformatted text (like 1. Item 1 etc.)

解决方案

It is losing the formatting because you are storing the RTF into a string and the string doesn't keep RTF formatting.

You can preserve it as following,

TextRange textRange = new TextRange(rtbTest.Document.ContentStart, rtbTest.Document.ContentEnd);
string rtf;
using (var memoryStream = new MemoryStream())
{
    textRange.Save(memoryStream, DataFormats.Rtf);
    rtf = ASCIIEncoding.Default.GetString(memoryStream.ToArray());
}

rtf = rtf.Replace("abcd", "rstu");


MemoryStream stream = new MemoryStream(ASCIIEncoding.Default.GetBytes(rtf));
rtbTest.SelectAll();
rtbTest.Selection.Load(stream, DataFormats.Rtf);

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