private static string RemoveExtension(string potentialPhoneNumber)
{
int length1 = potentialPhoneNumber.LastIndexOf("ext.", StringComparison.InvariantCultureIgnoreCase);
if (length1 >= 0 && PhoneNumberAttribute.MatchesExtension(potentialPhoneNumber.Substring(length1 + 4)))
{
return(potentialPhoneNumber.Substring(0, length1));
}
int length2 = potentialPhoneNumber.LastIndexOf("ext", StringComparison.InvariantCultureIgnoreCase);
if (length2 >= 0 && PhoneNumberAttribute.MatchesExtension(potentialPhoneNumber.Substring(length2 + 3)))
{
return(potentialPhoneNumber.Substring(0, length2));
}
int length3 = potentialPhoneNumber.LastIndexOf("x", StringComparison.InvariantCultureIgnoreCase);
return(length3 >= 0 && PhoneNumberAttribute.MatchesExtension(potentialPhoneNumber.Substring(length3 + 1)) ? potentialPhoneNumber.Substring(0, length3) : potentialPhoneNumber);
}
public override bool IsValid(object value)
{
if (value == null)
{
return(true);
}
string input = value as string;
if (input == string.Empty)
{
return(true);
}
if (PhoneNumberAttribute._regex != null)
{
return(input != null && PhoneNumberAttribute._regex.Match(input).Length > 0);
}
if (input == null)
{
return(false);
}
string str = PhoneNumberAttribute.RemoveExtension(input.Replace("+", string.Empty).TrimEnd());
bool flag = false;
foreach (char c in str)
{
if (char.IsDigit(c))
{
flag = true;
break;
}
}
if (!flag)
{
return(false);
}
foreach (char c in str)
{
if (!char.IsDigit(c) && !char.IsWhiteSpace(c) && "-.()".IndexOf(c) == -1)
{
return(false);
}
}
return(true);
}