#1,124 – Iterate through Jagged Array with Nested foreach

You can’t use the foreach statement to directly iterate over all elements in a jagged array.  You can, however, iterate through the jagged array using nested foreach statements.  Each foreach statement independently iterates over one dimension of the jagged array.

            // Jagged array - 3 elements, each of which is array of int
            int[][] nums = new int[3][];

            nums[0] = new int[4];
            nums[2] = new int[3];

            for (int i = 0; i < 4; i++)
                nums[0][i] = i + 1;

            for (int i = 0; i < 3; i++)
                nums[2][i] = i + 101;

            // Iterate using foreach
            foreach (int[] intArray in nums)
            {
                if (intArray != null)
                {
                    Console.WriteLine("Array with {0} elements", intArray.Length);
                    foreach (int n in intArray)
                        Console.WriteLine("  {0}", n);
                }
                else
                    Console.WriteLine("Found null array");
            }

1124-001

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,124 – Iterate through Jagged Array with Nested foreach

  1. Pingback: Dew Drop – June 24, 2014 (#1802) | Morning Dew

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