Is there a.NET utility class equivalent to java.util.Arrays.hashCode() for arrays of intrinsic types such as int[], short[], float[], etc.?
Obviously I could write my own utility class but was trying to find one already available in the .NET framework.
In .NET 4.0 arrays will support this via the IStructuralEquatable interface, but until that point you'll have to do it yourself I'm afraid.
I'm pretty sure there's nothing in the framework itself that does this. There may well be some third-party implementations, but there's nothing built-in (and public).
I'm not aware of such a thing being built-into .Net up to version 3.5, although .Net 4 is very likely to support it natively via the IStructuralEquatable interface which Array will implement (thanks to Greg Beech for pointing that out).
Here's a simple implementation using an extension method on IEnumerable.
int HashContents<T>(this IEnumerable<T> enumerable)
{
int hash = 0x218A9B2C;
foreach (var item in enumerable)
{
int thisHash = item.GetHashCode();
//mix up the bits.
hash = thisHash ^ ((hash << 5) + hash);
}
return hash;
}
This will give different hashcodes for {0,0} and {0,0,0}.
