獲取光標下的單詞是什麼是我的錯誤？

Question

我的錯誤是什麼？我想在網站上發佈textbox2.And抱歉，因爲我的英文不好。 :)

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

我相信你可能無意中指定textBox2而不是targetTextBox在你的代碼。

嘗試修改爲以下內容：

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); 
} 

注意到我改變textBox2到targetTextBox無論它出現在你的代碼。