TextBoxIndexofおよびLastIndexOf

TextBoxには検索機能がないため、必要に応じて独自のバージョンを作成および変更しました。関数を作成しました。1つは次の検索用、もう1つは前の検索用です

私の問題はそれです：

1. If my search term is more than 1 character long and I've searched for the term four times, IF on the 4th term I decide the click on search previous it goes back to the previous search term and that works fine. Now because I clicked on search previous 4 times and I went to the 3rd search term using previous, IF I decide to go the 4th term again using Find Next, I have to double click on find next and then it selects the 4th term.

2. If my search term is 1 character long and I want to search for a character, I type the character e.g. 'o' and it goes through each character in the textbox but once I decide to go back using search previous, I have to double click search previous button and then it goes back and if I decide to search next I have to double click again then it searches next.

これは、ダブルクリックとシングルクリックを理解するのに役立つ場合があります。

http://media.giphy.com/media/3xz2BJgF2DrtcCnP1e/giphy.gif

私はこれをかなり長い間機能させようとしてきましたが、運がありませんでした。私はこれでどこに行くのか分かりません、そして私が自分自身を混乱させる前に誰かがこれで私を助けてくれるならそれは素晴らしいでしょう。

私のコード：

変数

public int startPostion = 0;
boolean passedNext;
public int pos = 0;

次を検索

 public bool FindAndSelectNext(string TextToFind, bool MatchCase)
    {
        try
        {
            var mode = MatchCase ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
            int position = TheTextBox.Text.IndexOf(TextToFind, startPostion, mode);
            pos = position;

            if (position == -1)
            {
                var TheString = TheTextBox.Text;
                var foundposition2 = TheString.IndexOf(TextToFind, mode);

                TheTextBox.SelectionStart = foundposition2;
                TheTextBox.SelectionLength = TextToFind.Length;
                startPostion = foundposition2 + TextToFind.Length;
                TheTextBox.Focus();

                passedNext = false;
                Debug.WriteLine("1");
                return true;

            }
            else
            {
                TheTextBox.SelectionStart = position;
                TheTextBox.SelectionLength = TextToFind.Length;
                startPostion = position + TextToFind.Length;
                TheTextBox.Focus();

                passedNext = true;
                Debug.WriteLine("2");
                return true;
            }

        }
        catch (Exception ex)
        {
            MessageBox.Show(string.Format("Could not find '{0}' in the document.", TextToFind), ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        return true;
    }

前を検索

public bool FindAndSelectPrevious(string TextToFind, bool MatchCase)
    {
        StringComparison mode = MatchCase ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
        if (passedNext == true)
        {
            int foundPosition = startPostion < 0 ? TheTextBox.Text.Length : startPostion - 1;
            foundPosition = TheTextBox.Text.LastIndexOf(TextToFind, pos, mode);
            passedNext = false;
            if (foundPosition < 0)
            {
                if (startPostion < 0)
                {
                    MessageBox.Show(string.Format("Could not find '{0}' in the document.", TextToFind), ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return false;
                }
                foundPosition = TheTextBox.Text.LastIndexOf(TextToFind, mode);
                Debug.WriteLine("1p");
            }

            TheTextBox.SelectionStart = foundPosition;
            TheTextBox.SelectionLength = TextToFind.Length;
            startPostion = foundPosition;
            TheTextBox.Focus();
            Debug.WriteLine("2p");
            passedNext = false;
        }
        else
        {
            int foundPosition = startPostion < 0 ? TheTextBox.Text.Length : startPostion;
            foundPosition = TheTextBox.Text.LastIndexOf(TextToFind, foundPosition, mode);

            if (foundPosition < 0)
            {
                if (startPostion < 0)
                {
                    MessageBox.Show(string.Format("Could not find '{0}' in the document.", TextToFind), ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return false;
                }
                foundPosition = TheTextBox.Text.LastIndexOf(TextToFind, mode);
            }

            if (!(foundPosition == -1))
            {
                try
                {
                    int foundPositionz = startPostion < 0 ? TheTextBox.Text.Length : startPostion - 1;
                    foundPositionz = TheTextBox.Text.LastIndexOf(TextToFind, foundPositionz, mode);

                    TheTextBox.SelectionStart = foundPositionz;
                    TheTextBox.SelectionLength = TextToFind.Length;
                    startPostion = foundPositionz;
                    TheTextBox.Focus();
                }
                catch (Exception ex)
                {
                    var TheString = TheTextBox.Text;
                    var foundposition2 = TheString.LastIndexOf(TextToFind, mode);

                    TheTextBox.SelectionStart = foundposition2;
                    TheTextBox.SelectionLength = TextToFind.Length;
                    startPostion = foundposition2;
                    TheTextBox.Focus();
                    Debug.WriteLine("12p");
                }
            }
            else
            {
                MessageBox.Show(string.Format("Could not find '{0}' in the document.", TextToFind), ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
            }

        }
        return true;
    }