CODEWITHSUNDEEP
c#winformsrichtextboxpaint
pythonMan
pythonMan

Reputation: 35

How do you paint a specific line in a richTextBox C#?

Given this text in a RichTextBox:

str1
str2
str3

I don't know the length of all of them.
How can I paint the first line with green color and the third with blue? I read a bit of the SelectionColor but I don't want that the line will be marked. There's another way? Or maybe that way (with SelectionColor) but can you explain me how can I do it?

Upvotes: 1

Views: 580

Answers (2)

Salah Akbari
Salah Akbari

Reputation: 39976

Try one of the following ways:

  • giving it's value like this:

    richTextBox1.Find("str1"); 
richTextBox1.SelectionColor = Color.Green;
richTextBox1.Find("str3");
richTextBox1.SelectionColor = Color.Blue;

  • the other way like this:

    richTextBox1.Select(0, 3);//Select text within 0 and 3
richTextBox1.SelectionColor = Color.Green;
richTextBox1.Select(9, 12);
richTextBox1.SelectionColor = Color.Blue;

    Edit: To hide the selection add this line to end of your code : 

    richTextBox1.Select(0, 0);

Upvotes: 1

Idle_Mind
Idle_Mind

Reputation: 39152

I don't know the length of all of them.

Here's an alternate approach:

    private void button1_Click(object sender, EventArgs e)
    {
        ColorLine(0, Color.Green);
        ColorLine(2, Color.Blue);
    }

    private void ColorLine(int line, Color clr)
    {
        int index = richTextBox1.GetFirstCharIndexFromLine(line);
        int length = richTextBox1.Lines[line].Length;
        richTextBox1.Select(index, length);
        richTextBox1.SelectionColor = clr;
        richTextBox1.Select(0, 0);
    }

Upvotes: 0

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