richTextBox SelectionBackColor on multiple lines

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I'm trying to build a vertical line reference of yellow BG color with red foreground color (SelectionColor).

I currently only have two lines of text in my richTextBox.

But only the first line colors correctly. There is no color in the second line. How can I color each char at col 20 in each line (so it shows a vertical red line).

Thank you for any help...

C#

richTextBoxColumns.Text  = "         1         2         3         4         5\r\n";
richTextBoxColumns.Text += "12345678901234567890123456789012345678901234567890";
foreach (var line in richTextBoxColumns.Lines)
{
  richTextBoxColumns.Select(19,1);
  richTextBoxColumns.SelectionBackColor = Color.Yellow;
  richTextBoxColumns.SelectionColor = Color.Red;
}

Posted 1-Jul-14 13:17pm

rfresh

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2 solutions

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Nguyen.H.H.Dang · Accepted Answer · 2014-07-01T15:41:00

Solution 2

Try that, you will know why :

C#

richTextBoxColumns.Text = "         1         2         3         4         5\r\n";
richTextBoxColumns.Text += "12345678901234567890123456789012345678901234567890";
            
richTextBoxColumns.Select(19, 1);
richTextBoxColumns.SelectionBackColor = Color.Yellow;
richTextBoxColumns.SelectionColor = Color.Red;

int line1Length = richTextBoxColumns.Lines[0].Length;
richTextBoxColumns.Select(line1Length + 19, 1);
richTextBoxColumns.SelectionBackColor = Color.Yellow;
richTextBoxColumns.SelectionColor = Color.Red;

On

SQL

richTextBoxColumns.Select(line1Length + 19, 1);

Just change the "+ 19" part as your wish.

Debug this code and you will find that, your Font length has problem :)

Posted 1-Jul-14 15:41pm

Nguyen.H.H.Dang

Updated 1-Jul-14 15:43pm

v2

Comments

rfresh 1-Jul-14 21:58pm

I am using Courier New and I'm building the 'vertical line' marker on non-space characters...so I hope I will be OK. I will try it out tonight.

Thanks to both of you...

George Jonsson 1-Jul-14 22:25pm

How does your solution work if there is more than 2 lines?

Nguyen.H.H.Dang 1-Jul-14 22:52pm

@George Jonsson: I think the best way to let him know how to do things is show him what's wrong. That's how i learned programming too :)

About my solution, if he know what is wrong, he will know how to solve it :)

George Jonsson 1-Jul-14 22:59pm

Well, the foreach loop he used was not suitable in this case. So that was one error.

Nguyen.H.H.Dang 1-Jul-14 23:20pm

I dont like using foreach loop too, but if you really wanna use it, and textbox has more than 2 lines, this solution is good enough : (FONT = Courier New)

richTextBoxColumns.Text = " 1 2 3 4 5\r\n";
richTextBoxColumns.Text += "12345678901234567890123456789012345678901234567890\r\n";
richTextBoxColumns.Text += "12345678901234567890123456789012345678901234567890\r\n";
richTextBoxColumns.Text += "12345678901234567890123456789012345678901234567890\r\n";

int pos = 19;
int length = 0;
foreach (var line in richTextBoxColumns.Lines)
{
richTextBoxColumns.Select(length + pos, 1);
richTextBoxColumns.SelectionBackColor = Color.Yellow;
richTextBoxColumns.SelectionColor = Color.Red;
length += line.Length + 1;
}

George Jonsson · Accepted Answer · 2014-07-01T15:31:00

This is one way to do it.

C#

int markIndex = 0;
int startIndex = 0;
do
{
    markIndex = startIndex + 19;
    richTextBoxColumns.Select(markIndex, 1);
    richTextBoxColumns.SelectionBackColor = Color.Yellow;
    richTextBoxColumns.SelectionColor = Color.Red;
    startIndex = richTextBoxColumns.Text.IndexOf('\n', startIndex + 1);
} while (startIndex >= 0) ;
richTextBoxColumns.SelectedText = "";

The problem you will have is that you need to use a font with equal character spacing, such as Courier New, otherwise your vertical line will be less than straight.
white space still seems to be a problem, though.

Anyone else that have a solution for that?

richTextBox SelectionBackColor on multiple lines

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richTextBox SelectionBackColor on multiple lines

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