完善所以c#相关的文档和代码

codes/csharp/chapter_stack_and_queue/array_stack.cs

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+using System;
+using hello_algo.include;
+using NUnit.Framework;
+
+namespace hello_algo.chapter_stack_and_queue
+{
+
+    /* 基于数组实现的栈 */
+    class ArrayStack
+    {
+        private List<int> stack;
+        public ArrayStack()
+        {
+            // 初始化列表（动态数组）
+            stack = new();
+        }
+
+        /* 获取栈的长度 */
+        public int size()
+        {
+            return stack.Count();
+        }
+
+        /* 判断栈是否为空 */
+        public bool isEmpty()
+        {
+            return size() == 0;
+        }
+
+        /* 入栈 */
+        public void push(int num)
+        {
+            stack.Add(num);
+        }
+
+        /* 出栈 */
+        public int pop()
+        {
+            if (isEmpty())
+                throw new Exception();
+            var val = peek();
+            stack.RemoveAt(size() - 1);
+            return val;
+        }
+
+        /* 访问栈顶元素 */
+        public int peek()
+        {
+            if (isEmpty())
+                throw new Exception();
+            return stack[size() - 1];
+        }
+
+        /* 将 List 转化为 Array 并返回 */
+        public int[] toArray()
+        {
+            return stack.ToArray();
+        }
+    }
+
+    public class array_stack
+    {
+        [Test]
+        public void Test()
+        {
+            /* 初始化栈 */
+            ArrayStack stack = new ArrayStack();
+
+            /* 元素入栈 */
+            stack.push(1);
+            stack.push(3);
+            stack.push(2);
+            stack.push(5);
+            stack.push(4);
+            Console.WriteLine("栈 stack = " + String.Join(",", stack.toArray()));
+
+            /* 访问栈顶元素 */
+            int peek = stack.peek();
+            Console.WriteLine("栈顶元素 peek = " + peek);
+
+            /* 元素出栈 */
+            int pop = stack.pop();
+            Console.WriteLine("出栈元素 pop = " + pop + "，出栈后 stack = " + String.Join(",", stack.toArray()));
+
+            /* 获取栈的长度 */
+            int size = stack.size();
+            Console.WriteLine("栈的长度 size = " + size);
+
+            /* 判断是否为空 */
+            bool isEmpty = stack.isEmpty();
+            Console.WriteLine("栈是否为空 = " + isEmpty);
+        }
+    }
+}