请问如何详细解释C概念？

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%E4%B8%80%E7%BB%B4%E6%95%B0%E7%BB%84%E7%9A%84%E6%8F%92%E5%85%A5%EF%BC%9A%E5%AE%9E%E7%8E%B0%E6%95%88%E6%9E%9C%EF%BC%9A%E5%9C%A81+2+3+%E5%90%8E%E9%9D%A2%E6%8F%92%E5%85%A54%EF%BC%9Ausing System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Array { class Program { static void Main() { int[] arr={ 1, 2, 3 }; int num=4; // ...%EF%BC%9D

一维数组的插入：

实现效果：在1 2 3 后面插入4

using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Array { class Program { static void Main(string[] args) { int[] array = new int[] { 1, 2, 3 }; int[] des = addArray(array, 4, 4); foreach (int item in des) { Console.WriteLine(item ); } Console.ReadLine(); } static int[] addArray(int[] bornArray, int index, int value) { ArrayList list = new ArrayList(bornArray ); if (index <0) { index =0 ; } if (index >bornArray .Length -1) { index = bornArray.Length; } list.Insert(index ,value ); int[] des = new int[list.Count ]; for (int i=0;i<list.Count;i++) { des[i] = (int)list[i]; } return des; } } }