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csharp:Validate email address using C#

时间:2021-01-12 22:36来源:未知 点击:
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/// <summary>
   ///
   /// </summary>
   /// <param name="email"></param>
   /// <returns></returns>
   public bool IsValidEmail(string email)
   {
       try
       {
           var addr = new System.Net.Mail.MailAddress(email);
           return addr.Address == email;
       }
       catch
       {
           return false;
       }
   }
   /// <summary>
   /// using System.ComponentModel.DataAnnotations; 4.5 over  涂聚文(Geovin Du)标注
   /// </summary>
   /// <param name="source"></param>
   /// <returns></returns>
   public bool IsValidEmailDu(string source)
   {
       //https://referencesource.microsoft.com/#System.ComponentModel.DataAnnotations/DataAnnotations/EmailAddressAttribute.cs,54
       return new EmailAddressAttribute().IsValid(source);
   }
 
 
   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!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)"
           @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";
 
       return new Regex(validEmailPattern, RegexOptions.IgnoreCase);
   }
 
   internal  bool EmailIsValid(string emailAddress)
   {
       bool isValid = ValidEmailRegex.IsMatch(emailAddress);
 
       return isValid;
   }
   /// <summary>
   ///
   /// </summary>
   /// <param name="email"></param>
   /// <returns></returns>
   public  bool EmailIsValidGeovin(string email)
   {
       string expression = "\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";
 
       if (Regex.IsMatch(email, expression))
       {
           if (Regex.Replace(email, expression, string.Empty).Length == 0)
           {
               return true;
           }
       }
       return false;
   }
   /// <summary>
   ///
   /// </summary>
   /// <param name="email"></param>
   /// <returns></returns>
   public static bool IsValidEmailTu(this string email)
   {
       string pattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|" @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)" @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";
       var regex = new Regex(pattern, RegexOptions.IgnoreCase);
       return regex.IsMatch(email);
   }
   /// <summary>
   ///
   /// </summary>
   /// <param name="emailAddress"></param>
   /// <returns></returns>
   public static bool IsValidEmailAddress(string emailAddress)
   {
       bool MethodResult = false;
 
       try
       {
           System.Net.Mail.MailAddress m = new System.Net.Mail.MailAddress(emailAddress);
 
           MethodResult = m.Address == emailAddress;
 
       }
       catch //(Exception ex)
       {
           //ex.HandleException();https://stackoverflow.com/questions/1365407/c-sharp-code-to-validate-email-address
 
       }
 
       return MethodResult;
 
   }
   /// <summary>
   ///
   /// </summary>
   /// <param name="InputEmail"></param>
   /// <returns></returns>
   public static bool IsValidEmailId(string InputEmail)
   {
       Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
       Match match = regex.Match(InputEmail);
       if (match.Success)
           return true;
       else
           return false;
   }
   /// <summary>
   ///
   /// </summary>
   /// <param name="emailAddress"></param>
   /// <returns></returns>
   public bool ValidateEmail(string emailAddress)
   {
       string regexPattern = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$";
       Match matches = Regex.Match(emailAddress, regexPattern);
       return matches.Success;
   }

  

 
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