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Unique identifiers: Base62
public static string Base62Random()
{
int random = _random.Next();
return Base62ToString(random);
}
private static string Base62ToString(long value)
{
// Divides the number by 64, so how many 64s are in
// 'value'. This number is stored in Y.
// e.g #1
// 1) 1000 / 62 = 16, plus 8 remainder (stored in x).
// 2) 16 / 62 = 0, remainder 16
// 3) 16, 8 or G8:
// 4) 65 is A, add 6 to this = 71 or G.
//
// e.g #2:
// 1) 10000 / 62 = 161, remainder 18
// 2) 161 / 62 = 2, remainder 37
// 3) 2 / 62 = 0, remainder 2
// 4) 2, 37, 18, or 2,b,I:
// 5) 65 is A, add 27 to this (minus 10 from 37 as these are digits) = 92.
// Add 6 to 92, as 91-96 are symbols. 98 is b.
// 6)
long x = 0;
long y = Math.DivRem(value, 62, out x);
if (y > 0)
return Base62ToString(y) + ValToChar(x).ToString();
else
return ValToChar(x).ToString();
}
private static char ValToChar(long value)
{
if (value > 9)
{
int ascii = (65 + ((int)value - 10));
if (ascii > 90)
ascii += 6;
return (char)ascii;
}
else
return value.ToString()[0];
}
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