c# - Group by array contents -

i have list<tuple<string,long,byte[]>> , want group contents of byte array.

is there simple way groupby , lambda?

ideally, want without creating intermediate data structure (like string hold elements of array).

you can achieve using custom iequalitycomparer<byte[]> (or better, generic one: iequalitycomparer<t[]>) implementation:

class arraycomparer<t> : iequalitycomparer<t[]> {     public bool equals(t[] x, t[] y)     {         return x.sequenceequal(y);     }      public int gethashcode(t[] obj)     {         return obj.aggregate(string.empty, (s, i) => s + i.gethashcode(), s => s.gethashcode());     } } 

i'm pretty sure gethashcode implemented better, it's example!

usage:

var grouped = source.groupby(i => i.item3, new arraycomparer<byte>())