public static bool TryParse(string value, out ValidUsername username, out IReadOnlyCollection <string> errorMessages)
{
var errorMessageList = new List <string>();
errorMessages = errorMessageList;
if (IsEmpty(value))
{
// TryParse should never fail, so report null as an error instead of ArgumentNullException.
errorMessageList.Add("Value required");
}
else
{
value = Username.Normalize(value);
if (value.Length < MinLength || value.Length > MaxLength)
{
errorMessageList.Add(string.Format("Length must be from {0} to {1} characters", MinLength, MaxLength));
}
if (!Pattern.IsMatch(value))
{
errorMessageList.Add("Only alphanumeric characters and underscores are allowed");
}
}
if (errorMessageList.Count > 0)
{
username = null;
return(false);
}
username = new ValidUsername(value);
return(true);
}
public static bool TryParse(string value, out ValidUsername username)
{
IReadOnlyCollection <string> errorMessages;
return(TryParse(value, out username, out errorMessages));
}
