C# 用法總結 1

1 判斷文字框中輸入的IP地址是否合法

Regex reg = new Regex(@"(?n)^(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))/.){3}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))$");
if (reg.IsMatch(tb_IP.Text))
    lb_IP.Items.Add(tb_IP.Text);
else

    MessageBox.Show("It's not a variable IP!");

 

2 C＃刪除listbox中選定的項

            //確定訊息頭
            string title = "Confirmation";
            //確定訊息本文
            string text = "Are you sure,you want to delete selected filter value(s)?";

            DialogResult m_dr = MessageBox.Show(text, title, MessageBoxButtons.YesNo);
           
            if (m_dr==DialogResult.Yes)
            {
                lb_IP.Items.Remove(lb_IP.SelectedItem);
            }