Linq Example 4- SelectMany Compund From

5:18 AM
Linq Query:

//SelectMany Compound From 1
            int[] Numbers1 = { 0, 2, 4, 6, 8 };
            int[] Numbers2 = { 1, 3, 5, 7, 9 };

            var myPair =
                from n1 in Numbers1
                from n2 in Numbers2
                where n1 > n2
                select new { n1, n2 };

            foreach (var t in myPair)
            {
                Console.WriteLine(t.n1.ToString() +" - " + t.n2.ToString());
            }



Explanation:

What we are basically doing is that ,first we compute (Number1 X Number2) pairs.
we will have 25 pairs (5*5).

For example: (0,1),(0,3),(0,2) ... and so on..

Now i want to find in which pair the first element is greater than the second.
That 's what this query does it finds the pair ( out of this 25 ) which satisfy the condition.

Output:
2 - 1
4 - 1
4 - 3
6 - 1
6 - 3
6 - 5
8 - 1
8 - 3
8 - 5
8 - 7
2 - 1
4 - 1
4 - 3
6 - 1
6 - 3
6 - 5
8 - 1
8 - 3
8 - 5
8 - 7

We can do the same this with for loops .. see the code below which is equivalent to above linq query.

Without Linq:

for (int i = 0; i < Numbers1.Length; i++)
            {
                for (int j = 0; j < Numbers2.Length; j++)
                {
                    if (Numbers1[i] > Numbers2[j])
                    {
                        Console.WriteLine(Numbers1[i] + " - " + Numbers2[j]);
                    }
                }
            }



This above code will give the Same output as the linq query.

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