Richtextbox行数 [英] Richtextbox lines count

问题描述

我正在使用C#开发文本编辑器，并且试图进行行计数.

I'm developing a text editor in C#, and I'm trying to make a line count.

    private void updateNumberLabel()
    {
        Point pos = new Point(0, 0);
        int firstIndex = Document.GetCharIndexFromPosition(pos);
        int firstLine = Document.GetLineFromCharIndex(firstIndex);

        pos.X = ClientRectangle.Width;
        pos.Y = ClientRectangle.Height;

        int lastIndex = Document.GetCharIndexFromPosition(pos);
        int lastLine = Document.GetLineFromCharIndex(lastIndex);

        int actualLine = Document.GetLineFromCharIndex(actualPos);
        pos = Document.GetPositionFromCharIndex(lastIndex);

        if (lastLine != actualLine)
        {
            numberLabel.Text = "";
            for (int i = firstLine; i <= lastLine + 1; i++)
            {
                numberLabel.Text += i + 1 + "\n";
            }
        }
    }

它工作正常，并在您编写行时增加了行数，但是如果删除了一行，则只有在删除或再添加一行时才会更新.

It works fine and adds the number of lines while you write them, but if you delete one, it will only update if you delete or add one more line.

我要使其瞬时.如果删除一个，该计数应立即减少.

I want make it instantaneous. If you delete one, the count shall be decreased instantaneously.

推荐答案

也许这太简单了，但那又如何呢?

Maybe this is too easy, but what about that:

private void richTextBox1_TextChanged(object sender, EventArgs e)
{
  var lineCount = richTextBox.Lines.Count();
  numberLabel.Text = lineCount.ToString();
}

确保将其分配给TextChanged事件.

如果这不是您所需要的，请添加更多信息，以达到您的目标.

If this is not what you need, please add some more information what you are trying to achieve.

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