c# - Hashcodes - multiply or xor? -

c# - Hashcodes - multiply or xor? -

i saw hash function - , triggered alarms:

public override int gethashcode() { var result = 0; unchecked { result = anintid.gethashcode(); result *= 397 * (astring != null ? astring.gethashcode() : 0); } homecoming result; }

my automated hash-code-smell-fixer-subroutine wants rewrite read:

public override int gethashcode() { var result = 0; unchecked { result = anintid.gethashcode() * 397; result = (result * 397) ^ (astring != null ? astring.gethashcode() : 0); } homecoming result; }

i can't remember learned pattern, seems of doesn't create sense:

the first multiplication 397 looks waste of time [redacted] {in brain minus coffee context, interpreted ^ exponentiation}

does seem correct, or making mistakes?

c# gethashcode