c# - 获取光标下的单词我的错误是什么？

Question

我的错误是什么？我想在网站上对 textbox2 说一句话。对不起，因为我的英语不好。:)

private void txtHoverWord_MouseMove(object sender, MouseEventArgs e){
    if (!(sender is TextBox)) return;
    var targetTextBox = sender as TextBox;
    if (targetTextBox.TextLength < 1) return;

    var currentTextIndex = textBox2.GetCharIndexFromPosition(e.Location);
    var wordRegex = new Regex(@"(\w+)");
    var words = wordRegex.Matches(textBox2.Text);
    if (words.Count < 1) return;

    var currentWord = string.Empty;
    for (var i = words.Count - 1; i >= 0; i--)
    {
        if (words[i].Index <= currentTextIndex)
        {
            currentWord = words[i].Value;
            break;
        }
    }

    if (currentWord == string.Empty) return;
    toolTip1.SetToolTip(textBox2, currentWord);
}

Answer 1

我相信您可能无意中指定textBox2而不是targetTextBox在您的代码中指定。

尝试将其修改为以下内容：

private void txtHoverWord_MouseMove(object sender, MouseEventArgs e)
{
    if (!(sender is TextBox)) return;
    var targetTextBox = sender as TextBox;
    if (targetTextBox.TextLength < 1) return;

    var currentTextIndex = targetTextBox.GetCharIndexFromPosition(e.Location);
    var wordRegex = new Regex(@"(\w+)");
    var words = wordRegex.Matches(targetTextBox.Text);
    if (words.Count < 1) return;

    var currentWord = string.Empty;
    for (var i = words.Count - 1; i >= 0; i--)
    {
        if (words[i].Index <= currentTextIndex)
        {
            currentWord = words[i].Value;
            break;
        }
    }

    if (currentWord == string.Empty) return;
    tooltip1.SetToolTip(targetTextBox, currentWord);
}

请注意，我更改textBox2为targetTextBox它出现在您的代码中的任何位置。