/// <summary>
/// スネークケースに変換する。
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string CamelToSnake(string str, bool isUpper = false)
{
var charList = new NList <char>();
foreach (var item in str)
{
charList.Add(item);
}
int index = 1;
var target = new NList <char>();
for (int i = 0; i < charList.Count; i++)
{
var item = charList[i];
var nextItem = (charList.Count > i + 1)? charList[i + 1] : new char();
target.Add(item);
if (!charList.IsLast(item) && abcUpperList.Contains(nextItem))
{
target.Insert(index, '_');
index++;
}
index++;
}
var res = new string(target.ToArray());
return(isUpper ? res.ToUpper()
: res.ToLower()
);
}
