/// <summary>
/// To check whether it contains '@' in the mail ID
/// </summary>
/// <param name="strEmail"></param>
/// <returns></returns>
private MailErrorData ContainsAtTheRate(string inputEmail)
{
MailErrorData errData = new MailErrorData();
splitEmailId = inputEmail.Split(AtCharacter); //split the str email at the character @
count = splitEmailId.Length - 1; // count of chars
if (count == 0) //checks the str email does not contain @
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.AtSymbolNotPresent;
}
else if (count > 1)
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.AtSymbol_MultipleTimes;
}
else
{
userName = splitEmailId[0]; //assigning the splitted splitEmail[0] to user name
domainName = splitEmailId[splitEmailId.Length - 1]; //assigning the splitted splitEmail[1] to domain name
errData = ValidateEmailUserName(userName);
if (errData.isValidMail)
{
errData = ValidateEmailDomainName(domainName);
}
}
return(errData);
}
/// <summary>
/// To validate the domain name in the mailID
/// </summary>
/// <param name="domainName"></param>
/// <returns></returns>
private MailErrorData ValidateEmailDomainName(string domainName) // ValidEmailDomainName
{
MailErrorData errData = new MailErrorData();
indexOf = domainName.IndexOfAny(SpecialChars); //checks the presence of special characters in domain name and returning tru or false
if (string.IsNullOrEmpty(domainName) || indexOf != -1 || domainName[domainName.Length - 1] == DotCharacter) //checks the domain name is null is empty
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.DomainNameNotPresent;
}
else
{
count = domainName.Count(x => x == DotCharacter);//counts the number of occurences of '.' in domain name
splitDomainName = domainName.Split(DotCharacter);
for (int i = 0; i <= count; i++)
{
errData = CheckForHyphens(splitDomainName[i]);
if (!errData.isValidMail)
{
errData.mailErrorCode = MailIDErrorCode.HyphensInDomainName;
break;
}
}
}
return(errData);
}
/// <summary>
/// To validate the username in the mail ID
/// </summary>
/// <param name="UserName"></param>
/// <returns></returns>
private MailErrorData ValidateEmailUserName(string userName) // validateEmailUserName
{
MailErrorData errData = new MailErrorData();
indexOf = userName.IndexOfAny(SpecialChars); //checking for the presence of special characters
if (indexOf != -1) //checks index not equals 1 OR last character of the username is '.'
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.SpecialCharsPresent;
}
else if (userName[userName.Length - 1] == DotCharacter || userName[userName.Length - 1] == HyphenCharacter)//checks for the presence of '.' and '-' as the end characteer
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.DotRSpecialCharB4_AtSymbol;
}
else
{
count = userName.Count(x => x == DotCharacter);//counts the number of occurences of '.' in domain name and user name
splitUserName = userName.Split(DotCharacter);
for (int i = 0; i <= count; i++)
{
errData = CheckForHyphens(splitUserName[i]);
if (!errData.isValidMail)
{
errData.mailErrorCode = MailIDErrorCode.HyphensInUserName;
break;
}
}
}
return(errData);
}
/// <summary>
/// To Check the given mail ID is valid or not
/// </summary>
/// <param name="strEmail"></param>
/// <returns></returns>
public MailErrorData IsValidEmail(string inputEmail)
{
inputEmail = inputEmail.Trim(SemiColonCharacter); //trim the last char if it is ;
inputEmail = inputEmail.Trim(new char[0]); //trim the last null character
MailErrorData errData = new MailErrorData();
if (String.IsNullOrEmpty(inputEmail)) //checks whether the str email is null or empty
{
errData.isValidMail = false;
errData.mailErrorCode = MailIDErrorCode.ID_Empty;
}
else
{
errData = ContainsAtTheRate(inputEmail);
}
return(errData);
}
/// <summary>
/// To check for the improper hyphens in the domain name
/// </summary>
/// <param name="SplitDomainName"></param>
/// <returns></returns>
private MailErrorData CheckForHyphens(string SplitName)
{
MailErrorData errData = new MailErrorData();
string Domain = SplitName;
if (!SplitName.Contains(HyphenCharacter) && !string.IsNullOrEmpty(Domain))
{
//checks for the presence of any special characters in splitDomainName[count - i]
if (Domain[0] == HyphenCharacter || Domain[Domain.Length - 1] == HyphenCharacter)
{
errData.isValidMail = false;
}
else
{
errData.isValidMail = true;
}
}
else
{
errData.isValidMail = false;
}
return(errData);
}
