Combining multiple conditional expressions in C#

Question

In C#, instead of doing if(index == 7 || index == 8), is there a way to combine them? I\'m thinking of something like if(index == (7, 8)).

Answer 1

switch (GetExpensiveValue())
{
case 7: case 8:
   // do work
   break;
}

This obviously takes more code, but it may save you from evaluating a function a bunch of times.