static public string GetNextRoomId(string currentId)
{
if (LatinAlphabet == null)
{
LatinAlphabet = new List <char>();
for (char c = 'A'; c <= 'Z'; ++c)
{
LatinAlphabet.Add(c);
}
}
string newId;
if (currentId != null && currentId.Length > 0)
{
char lastChar = currentId[currentId.Length - 1];
int nextCharIndex = LatinAlphabet.IndexOf(lastChar) + 1;
if (nextCharIndex >= LatinAlphabet.Count)
{
newId = currentId + LatinAlphabet[0].ToString();
}
else
{
newId = LatinAlphabet[nextCharIndex].ToString();
}
}
else
{
newId = LatinAlphabet[0].ToString();
}
return(newId);
}
/// <summary> /// Lists the small letters. /// </summary> /// <returns>All small letters.</returns> public static IEnumerable <string> SmallLetters() => LatinAlphabet.SmallLetters();
/// <summary> /// Lists the capital letters. /// </summary> /// <returns>All captial letters.</returns> public static IEnumerable <string> CapitalLetters() => LatinAlphabet.CapitalLetters();
