CODEWITHSUNDEEP
c#winformsrichtextboxhighlight
Abdul Arif
Abdul Arif

Reputation: 45

Highlight entire line in Richtextbox if a text is present

enter image description here

I'm trying to highlight a particular line in my RichTextBox as shown in figure.

int ptrsize = 10;
int* linenum; 
for (int i = 0; i < ptrsize; i++)
{           
    int value = (linenum[i]) * 10;
    string searchText = value.ToString();
    int indexToText = richTextBox.Find(searchText);
    int endIndex = searchText.Length;
    richTextBox.Select(indexToText, endIndex);
    richTextBox.SelectionColor = Color.Blue;
}

If a text is present (i.e. 2010), i want to highlight the entire line.

2010 19.5 7.37 105 0.67 0.26 0.69

Upvotes: 0

Views: 2768

Answers (2)

Abdul Arif
Abdul Arif

Reputation: 45

I made some changes in previous code with the help of @TaW's code.

enter image description here

for (int j = 0; j < ptrsize; j++)
{
   int value = (linenum[j]) * 10;
   string searchText = value.ToString();
   for (int i = 0; i < richTextBox.Lines.Count(); i++)
      {
         highlightLineContaining(richTextBox, i, searchText, Color.Red);
      }
}

Upvotes: 1

TaW
TaW

Reputation: 54453

This will highlight a given line if it contains a given text:

void highlightLineContaining(RichTextBox rtb, int line, string search, Color color)
{
    int c0 = rtb.GetFirstCharIndexFromLine(line);
    int c1 = rtb.GetFirstCharIndexFromLine(line+1);
    if (c1 < 0) c1 = rtb.Text.Length;
    rtb.SelectionStart = c0;
    rtb.SelectionLength = c1 - c0;
    if (rtb.SelectedText.Contains(search))
        rtb.SelectionColor = color;
    rtb.SelectionLength = 0;
}

You may want to store and restore the original Selection.

Sometimes changing the SelectionBackColor looks better. Give it a try!

You could call it on the whole RTB :

for (int i = 0; i < richTextBox.Lines.Count(); i++)
      highlightLineContaining(richTextBox, i, searchText, Color.Red);

Upvotes: 3

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