C#交错数组知识点分析

public static void Main(string[] args)    {      int[][] arr = new int[5][];      arr[0] = new int[8];      arr[1] = new int[8];      arr[2] = new int[8];      arr[3] = new int[8];      arr[4] = new int[8];      Random rdm = new Random();      for (int i = 0; i < arr.Length; i++)      {        for (int j = 0; j < 8; j++)        {          arr[i][j] = rdm.Next(31);        }      }      foreach (int[]a in arr)      {        foreach (int b in a)        {          Console.Write("{0},", b);        }        Console.WriteLine("");      }       }