How to get all text from RichTextBox in WPF

Question

I need to get exactly all text from a WPF RichTextBox.

Everyone (How to get a WPF rich textbox into a string, RichTextBox (WPF) does not have string property "Text", http://msdn.microsoft.com/en-us/library/ms754041(v=vs.110).aspx and many more) agrees a code like this one:

public static string GetText(RichTextBox rtb)
{
    TextRange textRange = new TextRange(rtb.Document.ContentStart, rtb.Document.ContentEnd);
    string text = textRange.Text;
    return text;
}

but it add a trailling "\r\n". In a very simple case:

<RichTextBox x:Name="mRichTextBox">
  <FlowDocument>
    <Section>
      <Paragraph>
        <Run Text="The dog is brown. The cat is black."/>
      </Paragraph>
    </Section>
  </FlowDocument>
</RichTextBox>

I get:

"The dog is brown. The cat is black.\r\n"

It can be seen as a minor issue but really I need exact text.

• Do you know why?
• Is it safe to simply ignore one trailing "\r\n"?
• Is my code correct?
• Is there any other gotcha (I mean differences between real text and what I get from my GetText)?

Thanks.

Answer 1

If you don't need the multiline you can disable it and shouldn't have this problem.

You could also remove them like this:

  string text = textRange.Text.Replace(Environment.NewLine, "");

Also if you only want to remove the last ocurrence you can use a function like this:

public static string ReplaceLastOccurrence(string Source, string Find, string Replace)
{
    int Place = Source.LastIndexOf(Find);
    string result = Source.Remove(Place, Find.Length).Insert(Place, Replace);
    return result;
}

And use it like this.

 string text = ReplaceLastOccurrence(textRange.Text,Environment.NewLine,"");

Every time you have a you will get a New Line at the end, so make sure you handle it acordingly.

Answer 2

But you are getting the actual text.
You don't think a parargraph should end with a new line?

Try this and copy paste from the screen to notepad

<RichTextBox x:Name="mRichTextBox">
    <FlowDocument>
        <Section>
            <Paragraph/>
            <Paragraph/>
            <Paragraph>
                <Run Text="The dog is brown. The cat is black."/>
            </Paragraph>
        </Section>
    </FlowDocument>
</RichTextBox>