CODEWITHSUNDEEP
c#winformsrichtextboxhighlight
Abdul Arif
Abdul Arif

Reputation: 45

How do I highlight complete line in a RichTextbox in a C# form

After browsing a .txt file I stored each line in an array (i.e. filetext)...

String[] filetext = File.ReadAllLines(filepath);

How can i highlight particular lines with a color and show them in RichTextBox?

Upvotes: 2

Views: 929

Answers (2)

Abdul Arif
Abdul Arif

Reputation: 45

I found solution with the help of above code.

There is no need to store each line in an array.

for (int i = 0; i < ptrsize; i++)
{  
richTextBox1.Select(richTextBox1.GetFirstCharIndexFromLine(linenum[i]),richTextBox1.Lines[linenum[i]].Length);
richTextBox1.SelectionColor = Color.Red;
}

Upvotes: 0

stefankmitph
stefankmitph

Reputation: 3306

You can do it with a simple method (in your forms code):

private void ShowText(string[] text)
{
    richTextBox1.Clear();
    richTextBox1.Text = string.Join(Environment.NewLine, text);
}

and given a line number/index:

private void HighlightLine(int lineIdx)
{
    richTextBox1.Select(richTextBox1.GetFirstCharIndexFromLine(lineIdx), richTextBox1.Lines[lineIdx].Length);
    richTextBox1.SelectionColor = Color.Red;
}

Upvotes: 1

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