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POGroupBy on strings (hashcode collision)
 

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    1. USJohn Saunders
    1. UShl3mukkel
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      1. VTUpMod
    1. COGetHashCode works *with* Equals. It is merely to help in *implementing* a hash-based Map and can show *non-equality* but it cannot prove equality. The standard String.GetHashCode should work sufficiently well for this purpose (please provide a link to support "hasn't been implemented nicely"): an integer can represent a good bit more than 2000 values and occasional collisions just don't matter. You can't subclass String, but you could use an IEqualityComparer .. although I don't know why.
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      1. USuser2246674
    2. COAlso, the assertion about "mysteriously".GetHashCode() == "well".GetHashCode() is wrong in .NET 4.5 - I don't know about other versions but I would be very surprised if any .NET had a String hash code generation that was "absolutely abysmal" as hinted. (However, do keep in mind that hash algorithms *can* be targeted for collision attacks: this is much different than random input resulting in the same hash code. These attacks, and indeed "duplicate hashes" in general, can affect performance but do not affect correctness.)
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    3. COYes, I am sorry, I printed all strings out in each group, what I didn't consinder though is that strings can contain multiple lines and thus it looked like it was a match, bad debugging I guess sorry for that!
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