CODEWITHSUNDEEP
c#formattingrichtextboxremoving-whitespacepreserve
Zain
Zain

Reputation: 53

How to remove empty lines while preserving the formatting of the richtextbox in c#

I wish to preserve the italics in the text while removing all the empty lines. I can't seem to be able to do it.

I used this code. It removes the empty lines but the text the italics.

richTextBox1.Text = Regex.Replace(richTextBox1.Text, @"^\s*$(\n|\r|\r\n)", "", RegexOptions.Multiline);

Upvotes: 1

Views: 2639

Answers (2)

TaW
TaW

Reputation: 54433

The Golden Rule about RichTextBoxes is to never change the Text directly, once it has any formatting.

To add you use AppendText and to change you need to use the Select, Cut, Copy & Paste.. methods to preserve the formatting!

string needle = "\r\r";  // only one possible cause of empty lines

int p1 = richTextBox1.Find(needle);
while (p1 >= 0)
{
    richTextBox1.SelectionStart = p1;
    richTextBox1.Select(p1, needle.Length);
    richTextBox1.Cut();
    p1 = richTextBox1.Find(needle);
}

For multiple needles you'll need to call the code multiple times, I'm afraid..

Upvotes: 2

prem
prem

Reputation: 3538

You can try removing empty lines from its Rtf Text. The sample code given below will work for you.

String[] allLines = richTextBox1
                    .Rtf
                    .Split( new string[] { Environment.NewLine },StringSplitOptions.None);

dynamic linesWithoutEmptyLines = from itm in allLines 
                                 where itm.Trim() != "\\par" 
                                 select itm;

richTextBox1.Rtf = string
                   .Join(Environment.NewLine, linesWithoutEmptyLines);

It will preserve the formatting of text and going to remove all the empty lines.

Upvotes: 1

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