[C#]10进制到Excel的26进制的转换函数

private string convertToCharacter(int i)
        {
            char[] list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
            StringBuilder sb = new StringBuilder();
            while ((i -1) / 26 != 0)
            {
                sb.Append(list[i / 26 - 1]);
                i = i % 26;
            }
            i = (i - 1) % 26;
            sb.Append(list[i]);
            return sb.ToString();
        }