//validation module
public string this[string parameter]
{
get
{
string error = null;
switch (parameter)
{
case "Username":
Regex regex = new Regex(regexUsername);
Match match = regex.Match(Username);
if (string.IsNullOrWhiteSpace(Username))
{
error = "Username is required.";
IsValidUsername = false;
}
else if (!match.Success)
{
error = "Username must be valid username format and contains only alphabetic symbols and numbers.\n" +
"For example 'Cyberprank2020'";
IsValidUsername = false;
}
else if (Username.Length < MIN_USERNAME_LENGTH || Username.Length > MAX_USERNAME_LENGTH)
{
error = "Username length nust be no less than 6 symbols and no more than 20 symbols.";
IsValidUsername = false;
}
else
{
IsValidUsername = true;
}
break;
case "IP":
regex = new Regex(regexIP);
match = regex.Match(IP);
if (string.IsNullOrWhiteSpace(IP))
{
error = "IP is required";
IsValidIP = false;
}
else if (!match.Success)
{
error = "IP must be valid ip format. For example '192.168.1.0'";
IsValidIP = false;
}
else
{
IsValidIP = true;
}
break;
case "Port":
if (string.IsNullOrWhiteSpace(Port))
{
error = "Port is required";
IsValidPort = false;
}
else if (!Port.All(char.IsDigit))
{
error = "Port must be valid";
IsValidPort = false;
}
else
{
IsValidPort = true;
}
break;
}
if (Errors.ContainsKey(parameter))
{
Errors[parameter] = error;
}
else if (error != null)
{
Errors.Add(parameter, error);
}
RaisePropertyChanged(nameof(Errors));
return(error);
}
}