static void QueryCartesianProduct()
{
using (var even = new EvenNumberGenerator(10))
{
using (var odd = new OddNumberGenerator(10))
{
var evenObservable = Observable.FromEvent <int>(
a => even.NumberGenerated += a,
r => even.NumberGenerated -= r);
var oddObservable = Observable.FromEvent <int>
(a => odd.NumberGenerated += a,
r => odd.NumberGenerated -= r);
// Re-write this query to insert the side-effect
// of printing every value of n3, i.e. the product of n1 and n2
// before the filter is applied on n3
var composition = from n1 in evenObservable
from n2 in oddObservable
let n3 = n1 * n2
where n3 < 50
select n3;
var subscription = composition.Subscribe(Console.WriteLine);
Console.WriteLine("Press any key to exit the program.");
Console.ReadKey();
subscription.Dispose();
}
}
}
static void QueryZip()
{
using (var even = new EvenNumberGenerator(10))
{
using (var odd = new OddNumberGenerator(10))
{
var evenObservable = Observable.FromEvent <int>(
a => even.NumberGenerated += a,
r => even.NumberGenerated -= r);
var oddObservable = Observable.FromEvent <int>
(a => odd.NumberGenerated += a,
r => odd.NumberGenerated -= r);
var composition = evenObservable
.Zip(oddObservable, (n1, n2) => n1 * n2)
.Do(product => Console.WriteLine($"Product : {product}"))
.Where(product => product < 50);
var subscription = composition.Subscribe(Console.WriteLine);
Console.WriteLine("Press any key to exit the program.");
Console.ReadKey();
subscription.Dispose();
}
}
}
public void TestOddNumberGenerator()
{
const string expected = "1, 3, 5, 7, 9";
var generator = new OddNumberGenerator {
Range = new Range0To10()
};
var result = generator.GenerateOutput();
Assert.AreEqual(expected, result);
}
public static int Generate(int min, int max, out int iterationCount)
{
int generatedNumber;
bool isPrime;
iterationCount = 0;
do
{
generatedNumber = OddNumberGenerator.Generate(min, max);
isPrime = PrimeNumChecker.IsPrime(generatedNumber);
iterationCount++;
}while (!isPrime);
return(generatedNumber);
}
