在C#中，数组声明有以下几种技巧：
new来声明数组并初始化：int[] numbers = new int[5];
{}来初始化数组元素：int[] numbers = {1, 2, 3, 4, 5};
var关键字来简化声明：var numbers = new int[5];
Array类的静态方法创建数组：int[] numbers = Array.CreateInstance(typeof(int), 5) as int[];
int[,] matrix = new int[3, 3];
int[][] jaggedArray = new int[3][];
jaggedArray[0] = new int[3];
jaggedArray[1] = new int[4];
jaggedArray[2] = new int[2];
