C#电子邮件验证与if语句 [英] c# email validation with if statement

问题描述

如何确保@和.之间至少有两个字符. character

how do you make sure there is atleast two characters between the @ and the . character

推荐答案

示例:

Hi,

Example:

string emailAddr = "[e-mail]";
bool isValid = IsEMailAddrValid(emailAddr);
if (isValid)
{
  // popup message box?
}
// Do anything ?

private bool IsEMailAddrValid(string emailAddr)
{
   bool result = true;
   int count = emailAddr.Count(f => f == '@');
   if (count == 0)
   {
       return false;
   }
   if (count > 1)
   {
      return false;
   }
   count = emailAddr.Count(f => f == '.');
   if (count == 0)
   {
      return false;
   }
   if (count > 1)
   {
      return false;
   }
   string theChar = emailAddr.Split('@')[1].ToString();
   int theCharLen = theChar.Split('.')[0].ToString().Length;
   if (theCharLen < 2)
   {
      result = false;
   }
   return result;
} 

Regards,

使用此类

use this class

using System.Text.RegularExpressions;

public static class Validator
{

    static Regex ValidEmailRegex = CreateValidEmailRegex();

    /// <summary>
    /// Taken from http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx
    /// </summary>
    /// <returns></returns>
    private static Regex CreateValidEmailRegex()
    {
        string validEmailPattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|"
            + @"([-a-z0-9!#

％& ;'* +/=?^ _`{|}〜] |(?<！\.)\.)*)(?<！\.)" + @"

%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)" + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]

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