C#学习笔记—数组

1、C#数组初始化语法

        static void ArrayInitialization()
        {
            //使用new关键字的数组初始化语法
            string[] stringArray = new string[] { "one", "two", "three" };
            Console.WriteLine("stringArray has {0} elements", stringArray.Length);
            //你使用new关键字的数组初始化方法
            bool[] boolArray = { false, false, true };
            Console.WriteLine("boolArray has {0} elements", boolArray.Length);
        }

2、隐式类型本地数组

        static void DeclareImplicitArrays()
        {
            //a 实际上是int[]
            var a = new[] { 1, 100, 10, 1000 };
            Console.WriteLine("a is a: {0}", a.ToString());
            //b实际上是string[]
            var c = new[] { "hello", null, "world" };
            Console.WriteLine("c is a: {0}", c.ToString());
            Console.WriteLine();
        }

3、定于object数组

        static void ArrayOfObjects()
        {
            //对象数组可以是任何东西
            object[] myObjects = new object[4];
            myObjects[0] = 10;
            myObjects[1] = false;
            myObjects[2] = new DateTime(2012,11, 11);
            myObjects[3] = "string";

            foreach (object obj in myObjects)
            {
                Console.WriteLine("Type:{0}, Value:{1}", obj.GetType(), obj);
            }
            Console.WriteLine();
        }

4、矩形多维数组

        static void RectMultidimensionalArray()
        {
            //矩形多维数组
            int[,] myMatrix = new int[6,6];
            //填充6×6数组
            for (int i = 0; i < 6; i++)
                for (int j = 0; j < 6; j++)
                    myMatrix[i, j] = i * j;
            //输出6×6数组
            for (int i = 0; i < 6; i++)
            {
                for (int j = 0; j < 6; j++)
                    Console.Write(myMatrix[i, j] + "\t");
                Console.WriteLine();
            }
            Console.WriteLine();
        }

5、交错多维数组

        static void JaggedMultidimensionalArray()
        {
            //交错多维数组，声明一个具有5个不同数组的数组
            int[][] myJagArray = new int[5][];

            //创建交错数组
            for (int i = 0; i < myJagArray.Length; i++)
                myJagArray[i] = new int[i + 7];
            //输出每一行
            for (int i = 0; i < 5; i++)
            {
                for (int j = 0; j < myJagArray[i].Length; j++)
                    Console.Write(myJagArray[i][j] + " ");
                Console.WriteLine();
            }
            Console.WriteLine();
        }

6、数组作为参数

        static void PrintArray(int[] myInts)
        {
            for (int i = 0; i < myInts.Length; i++)
                Console.WriteLine("Item {0} is {1}", i, myInts[i]);
        }

        static string[] GetStringArray()
        {
            string[] theStrings = { "Hello", "from", "GetStringArray"};
            return theStrings;
        }

        static void PassAndReceiveArrays()
        {
            //传递数组作为参数
            int[] ages = { 20, 22, 23, 0 };
            PrintArray(ages);

            //获取数组作为返回值
            string[] strs = GetStringArray();
            foreach (string s in strs)
                Console.WriteLine(s);

            Console.WriteLine();
        }

7、System.Array基类

Clear()：这个静态方法将数组中一系列元素设置为空值

CopyTo()：这个方法用来将原数组中的元素复制到目标数组中

Length： 这个属性返回数组中项的个数

Rank：这个属性返回当前数组维数

Reverse()：这个静态方法反转一维数组的内容

Sort()：这个静态方法为内建类型的一维数组排序。如果数组中的元素实现IComparer接口，就可以为自定义类型排序。