Question

If you have a string of “1,2,3,1,5,7” you can put this in an array or hash table or whatever is deemed best.

How do you determine that all value are the same? In the above example it would fail but if you had “1,1,1” that would be true.

Answer 1

This can be done nicely using lambda expressions.

For an array, named arr:

var allSame = Array.TrueForAll(arr, x => x == arr[0]);

For an list (List<T>), named lst:

var allSame = lst.TrueForAll(x => x == lst[0]);

And for an iterable (IEnumerable<T>), named col:

var first = col.First();
var allSame = col.All(x => x == first);

Note that these methods don’t handle empty arrays/lists/iterables however. Such support would be trivial to add however.