csharp基础....

int[][] jaggedArray = new int[3][];

jaggedArray[0] = new int[] { 1, 2 };

jaggedArray[1] = new int[] { 3, 4, 5 };

jaggedArray[2] = new int[] { 6, 7, 8, 9 };

嵌套

 

反转和排序

List<int> list = new List<int> { 1, 2, 3, 4, 5 };

list.Reverse();

Console.WriteLine(string.Join(", ", list)); // 输出：5, 4, 3, 2, 1

 

 

int[] array = { 5, 3, 4, 1, 2 };

Array.Sort(array);

Console.WriteLine(string.Join(", ", array)); // 输出：1, 2, 3, 4, 5

 

转换

(toarray join)

List<string> wordList = new List<string>(words);

 

List<int> intList = new List<int>(intArray)

 

toarray

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

string result = string.Join("", numbers);

join第一个是分隔符

 

 

 

增删改

数组字符串

索引

Array.Copy(array, 2, slice, 0, 3);

xxx字符串.substring(索引，长度)

 

 

 

列表

add

remove removeat 

索引

foreach (int I In  )

---

---

arraylist 自动扩容 arraylist (2)限定了长度也会扩容

 

var list =new list ﹤>(){}

避免装箱拆箱操作

 

list.contains 

---

var hashtable=new hashtable 

containskey 

---

---

var dic =new  dictionary <,>

---

---

var queue  new queue 

 

enqueue

dequeue 

 

stack push  pop