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これは、リッチテキスト ボックス内のテキストを検索して強調表示するコードです。

        int start = 0;
        int indexOfSearchText = 0;

        private void button1_Click(object sender, EventArgs e)
        {
            int startindex = 0;

            if (textBox1.Text.Length > 0)
                startindex = FindMyText(textBox1.Text.Trim(), start, richTextBox1.Text.Length);

            // If string was found in the RichTextBox, highlight it
            if (startindex >= 0)
            {
                // Set the highlight color as red
                richTextBox1.SelectionBackColor = Color.Red;
                // Find the end index. End Index = number of characters in textbox
                int endindex = textBox1.Text.Length;
                // Highlight the search string
                richTextBox1.Select(startindex, endindex);
                richTextBox1.ScrollToCaret();
                // mark the start position after the position of
                // last search string
                start = startindex + endindex;
            }

            else
            {
                MessageBox.Show("0 occurence in richtextbox");
            }
        }

        public int FindMyText(string txtToSearch, int searchStart, int searchEnd)
        {
            // Unselect the previously searched string
            if (searchStart > 0 && searchEnd > 0 && indexOfSearchText >= 0)
            {
                richTextBox1.Undo();
            }

            // Set the return value to -1 by default.
            int retVal = -1;

            // A valid starting index should be specified.
            // if indexOfSearchText = -1, the end of search
            if (searchStart >= 0 && indexOfSearchText >= 0)
            {
                // A valid ending index
                if (searchEnd > searchStart || searchEnd == -1)
                {
                    // Find the position of search string in RichTextBox
                    indexOfSearchText = richTextBox1.Find(txtToSearch, searchStart, searchEnd, RichTextBoxFinds.None);
                    // Determine whether the text was found in richTextBox1.
                    if (indexOfSearchText != -1)
                    {
                        // Return the index to the specified search text.
                        retVal = indexOfSearchText;
                    }
                }
            }
            return retVal;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            start = 0;
            indexOfSearchText = 0;
        }
    }
}

問題は、richtextBox1 の最後に到達したときに、最初から再開されなかったことです。richtextBox1.text の最後に到達したら、もう一度先頭にループしたい。

4

2 に答える 2

0

これはどうですか？

if (textBox1.Text.Length > 0)
{
    startindex = FindMyText(textBox1.Text.Trim(), start, richTextBox1.Text.Length);
    if(startindex == -1 && start > 0) // Not found string and not searching from beginning
    {
        // Wrap search
        int oldStart = start;
        start = 0;
        startindex = FindMyText(textBox1.Text.Trim(), start, oldStart);
    }
}
于 2012-08-23T13:21:35.557 に答える