foreach的用法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            double[,] hillHeight = {{,,,},{,,,},{,,,}};
            foreach (double height in hillHeight)
            {
                Console.WriteLine("{0}",height);
            }
            Console.ReadKey();
        }
    }
}