CODEWITHSUNDEEP
c#
Andy Surya
Andy Surya

Reputation: 117

search and highlight text in textbox

im trying to make some kind of search function in my program which is just highlighting all keywords found on textbox

the keyword box is on t2.text and the text is from bx2.text

firstly i tried out this method from here Highlight key words in a given search text

the regex is working but the highlight not

any wrong here?

    private void searchs()
    {
        var spattern = t2.Text;

        foreach(var s in bx2.Text)
        {
            var zxc = s.ToString();
            if (System.Text.RegularExpressions.Regex.IsMatch(zxc, spattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase))
            {
               bx2.Text.Replace(bx2.Text, @"<span class=""search-highlight"">$0</span>");
            }
        }
    }

Upvotes: 0

Views: 9281

Answers (2)

Sudeepta Roy
Sudeepta Roy

Reputation: 31

private void findButton_Click(object sender, EventArgs e)
{
    int count = 0;
    string keyword = keywordTextbox.Text.Trim();//getting given searching string
    int startPosition = 0; //initializing starting position to search
    int endPosition = 0;
    int endArticle = articleRichTextbox.Text.Length;//finding total number of character into the article
    for (int i = 0; i<endArticle  ; i =startPosition )//creating a loop until ending the article
    {
        if (i == -1) //if the loop goes to end of the article then stop
        {
            break;
        }
        startPosition = articleRichTextbox.Find(keyword, startPosition, endArticle, RichTextBoxFinds.WholeWord);//using find method get the begining position when find the searching string
        if (startPosition >= 0)     //if match the string                                                         //if don't match the string then it  return -1
        {
            count++;//conunting the number of occuerence or match the search string
            articleRichTextbox.SelectionColor = Color.Blue;//coloring the matching string in the article
            endPosition = keywordTextbox.Text.Length;
            startPosition = startPosition + endPosition;//place the starting position at the next word of previously matching string to continue searching.

        }


    }

    if (count == 0)//if the givn search string don't match at any time
    {
        MessageBox.Show("No Match Found!!!");
    }

    numberofaccurTextbox.Text = count.ToString();//show the number of occurence into the text box
}

Upvotes: 1

Serge Wautier
Serge Wautier

Reputation: 21878

The linked question uses HTML formatting, which you can't use in a regular textbox.

You need either a RichText box. In there you can format text using the control's methods and properties (not using HTML).

Or use a browser control rather than a textbox to use the HTML formatting.

Upvotes: 1

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