Get a unique integer value with array of objects received as input.

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C#4.0

I have a function which has params as an argument to it, so that it can take as many and any type of input. This function needs to give as output, an integer which is unique to the set of inputs received.

So to summarize, if it receives a different set of params it needs to generate a different integer, however if it receives same set of params if needs to give the same int again.

private int GetUniqueValue(params object[] input)
        {
             //return a unique integer
        }

What I have tried:

I was thinking in terms of hashcode and using GetHashCode method but then msdn says that "The default implementation of the GetHashCode method does not guarantee unique return values for different objects"