1. Remove unused libs.

2. Add file headers.
3. Modify file name to match Java's.
4. Fix some issues.

codes/csharp/chapter_array_and_linkedlist/Array.cs

@@ -1,4 +1,4 @@
-// File: Array.cs
+// File: array.cs
 // Created Time: 2022-12-14
 // Author: mingXta (1195669834@qq.com)
 
@@ -6,7 +6,7 @@ using NUnit.Framework;
 
 namespace hello_algo.chapter_array_and_linkedlist
 {
-    public class Array
+    public class array
     {
         /// <summary>
         /// 随机返回一个数组元素

codes/csharp/chapter_array_and_linkedlist/linked_list.cs

@@ -1,4 +1,4 @@
-// File: LinkedList.cs
+// File: linked_list.cs
 // Created Time: 2022-12-16
 // Author: mingXta (1195669834@qq.com)
 
@@ -7,14 +7,14 @@ using NUnit.Framework;
 
 namespace hello_algo.chapter_array_and_linkedlist
 {
-    public class LinkedList
+    public class linked_list
     {
         /// <summary>
         /// 在链表的结点 n0 之后插入结点 P
         /// </summary>
         public static void Insert(ListNode n0, ListNode P)
         {
-            ListNode n1 = n0.next;
+            ListNode? n1 = n0.next;
             n0.next = P;
             P.next = n1;
         }
@@ -28,7 +28,7 @@ namespace hello_algo.chapter_array_and_linkedlist
                 return;
             // n0 -> P -> n1
             ListNode P = n0.next;
-            ListNode n1 = P.next;
+            ListNode? n1 = P.next;
             n0.next = n1;
         }
 
@@ -78,15 +78,15 @@ namespace hello_algo.chapter_array_and_linkedlist
             n1.next = n2;
             n2.next = n3;
             n3.next = n4;
-            Console.WriteLine($"初始化的链表为{n0}");
+            Console.WriteLine($"初始化的链表为 {n0}");
 
             // 插入结点 
             Insert(n0, new ListNode(0));
-            Console.WriteLine($"插入结点后的链表为{n0}");
+            Console.WriteLine($"插入结点后的链表为 {n0}");
 
             // 删除结点 
             Remove(n0);
-            Console.WriteLine($"删除结点后的链表为{n0}");
+            Console.WriteLine($"删除结点后的链表为 {n0}");
 
             // 访问结点 
             ListNode? node = Access(n0, 3);

codes/csharp/chapter_array_and_linkedlist/list.cs

@@ -1,11 +1,8 @@
-using Newtonsoft.Json.Linq;
+// File: list.cs
+// Created Time: 2022-12-16
+// Author: mingXta (1195669834@qq.com)
+
 using NUnit.Framework;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Xml.Linq;
 
 namespace hello_algo.chapter_array_and_linkedlist
 {
@@ -46,7 +43,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             Console.WriteLine("在索引 3 处插入数字 6 ，得到 list = " + string.Join(",", list));
 
             /* 删除元素 */
-            list.Remove(3);
+            list.RemoveAt(3);
             Console.WriteLine("删除索引 3 处的元素，得到 list = " + string.Join(",", list));
 
             /* 通过索引遍历列表 */

codes/csharp/chapter_array_and_linkedlist/my_list.cs

@@ -1,10 +1,8 @@
-using Newtonsoft.Json.Linq;
+// File: my_list.cs
+// Created Time: 2022-12-16
+// Author: mingXta (1195669834@qq.com)
+
 using NUnit.Framework;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace hello_algo.chapter_array_and_linkedlist
 {