Short question: How do I get the object.GetHashCode()
value for an object that has re-implemented GetHashCode()
?
Long story: So I have about a hundred thousand objects, each sharing many (non-compile time) common strings. Common as in if the value is equal, it is the same instance.
Knowing that, I figure I'd rather use a standard object comparison (ReferenceEquals
) rather than a full string compare - particularly as these are looked up in dictionaries on a fairly regular basis.
So I declare a class ReferenceEqualityComparer : IEqualityComparer
to use with a Dictionary<string, TValue>
, figuring it'd be useful to have anyway, and go about trying to implement the two methods.
Equals is easy enough, use object.ReferenceEquals
.
But how do I get the equivalent of object.GetHashCode()
for the GetHashCode
method?
ie how do I get some representation of an object's instance?
I know there are other ways I can go about doing this - create an InternedString
class which holds a reference to the string
, but does not implement Equals
or GetHashCode
, or store indexes rather than strings with each object, but I'm now curious - is there actually a way to implement a generic ReferenceEqualityComparer
?