c# - 在 C# Windows 窗体中如何实现电子邮件地址的 MaskedTextBox

Question

   public void Form1_Load(Object sender, EventArgs e) 
    {
          // Other initialization code
         mtxtEmailID.Mask = ".........."; 

代替点的掩码类型应该是什么

         mtxtEmailID.MaskInputRejected += new MaskInputRejectedEventHandler(mtxtEmailID_MaskInputRejected)
    }

   void mtxtEmailID_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
   {
      if(!Regex.IsMatch(txtEmailID.Text, "^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"))  

这里的正则表达式给我错误，让我知道什么是正确的电子邮件验证。

         {
         toolTip1.ToolTipTitle = "Invalid Input";
         toolTip1.Show("Enter valid email address", mtxtEMailID);
         }
   }

Answer 1

您可以找到有关 MaskedTextBox 的信息 here

---

如果你想验证一个电子邮件地址 Regex 不是正确的选择。regex 无法涵盖许多极端情况......

使用MailAddress

try 
{
   address = new MailAddress(address).Address;
   //email address is valid since the above line has not thrown an exception
} 
catch(FormatException) 
{
   //address is invalid
}

---

但是如果你需要正则表达式，它应该是:

.+@.+