在一個文本框限制連續逗號的數量

Question

如何限制在一個文本框連續「逗號」是多少？......當然不應該允許用戶輸入超過2逗號繼續

Answer 1

這應該處理大多數情況下我相信：

private void TextBox_TextChanged(object sender, EventArgs e) 
{ 
    TextBox tb = sender as TextBox; 
    if (tb != null) 
    { 
     int pos = tb.SelectionStart; 
     int length = tb.Text.Length; 
     tb.Text = tb.Text.Replace(",,", ","); 
     int diff = length- tb.Text.Length; 
     tb.SelectionStart = pos == 0 || diff == 0 ? pos : pos - diff; 
    } 
} 

這時候您鍵入的文本到TextBox，以及當你將文本粘貼到它的工作原理。

Answer 2

private void TextBox_KeyDown(object sender, KeyEventArgs e) 
{ 
    if(e.KeyChar == ',') 
    { 
     if(TextBox.Text.Contains(",,")) 
     { 
      e.Handled = true; 
     } 
    } 
}