static string Number = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
/// <summary>
/// 壓縮ID標識
/// </summary>
/// <param name="n"></param>
/// <returns></returns>
public string Short(long n) {
string result = string.Empty;
int l = Number.Length;
while (n / l >= 1) {
result = Number[(int)(n % l)] + result;
n /= l;
}
result = Number[(int)n] + result;
return result;
}
/// <summary>
/// 還原ID標識
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public long UnShort(string s) {
long result = 0;
if (s.HasValue()) {
s = s.Trim();
int l = s.Length;
int m = Number.Length;
for (int x = 0; x < l; x++) {
result += Number.IndexOf(s[l - 1 - x]) * (long)Math.Pow(m, x);
}
}
return result;
}
