C#——向数组中添加元素，数组

向数组中添加元素

static int[]  AddArray1(int[] array, int index1, int value1)
        {
            if (index1 >= array.Length)
                index1 = array.Length - 1;
            int[] _array = new int[array.Length + 1];
            for (int i = 0; i < _array.Length; i++)
           {
                    if (index1 >= 0)
                    {
                        if (i < index1 + 1)
                            _array[i] = array[i];
                        else if (i == index1 + 1)
                            _array[i] = value1;
                        else
                            _array[i] = array[i - 1];
                    }
                    else
                    {
                        if (i == 0)
                            _array[i] =  value1;
                        else
                            _array[i] = array[i - 1];
                    }
                } 
            return _array;
        }

向数组中添加数组

static int[] AddArray2(int[] arrayB, int[] arrayAdd, int index2)
        {
            if (index2 >= arrayB.Length)
                index2 = arrayB.Length - 1;
            int[] newArray = new int[arrayB.Length + arrayAdd.Length];
            for(int i = 0; i < newArray.Length; i++)
            {
                if (index2 >= 0)
                {
                    if (i < index2 + 1)
                        newArray[i] = arrayB[i];
                    else if (i == index2 + 1)
                    {
                        for (int j = 0; j < arrayAdd.Length; j++)
                        {
                            newArray[i + j] = arrayAdd[j];
                        }
                        i = i + arrayAdd.Length - 1;
                    }
                    else
                        newArray[i] = arrayB[i - arrayAdd.Length];
                }
                else
                {
                    if(i == 0)
                    {
                        for (int j = 0; j < arrayAdd.Length; j++)
                        {
                            newArray[i + j] = arrayAdd[j];
                            i = i + arrayAdd.Length - 1;
                        }
                    }
                    else
                    {
                        newArray[i] = arrayB[i - arrayAdd.Length];
                    }
                }
            }
            return newArray;
        }

测试

static void Main(string[] args)
        {
            //原始数组
            int[] array = new int[] { 1, 2, 3, 4, 5, 6, 7, 7 };
            foreach (int i in array)
                Console.Write(i + " ");
            Console.WriteLine();

            //添加的数组
            int[] arrayAdd = new int[] { 7, 6, 5, 4, 3, 2, 1 };


            //数组加入元素
            array = AddArray1(array, 3, 45);
            foreach (int i in array)
                Console.Write(i + " ");


            //数组加入数组
            //array = AddArray2(array, arrayAdd, 5);
            //foreach (int i in array)
            //Console.Write(i + " ");


            Console.ReadLine();

        }