From 0cf37e3f8eaeadb4c9c054828359e582e743d068 Mon Sep 17 00:00:00 2001
From: moonache <476681765@qq.com>
Date: Fri, 30 Dec 2022 14:35:54 +0800
Subject: [PATCH 1/2] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20deque.cs?=
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以 C# 内置的双向队列 LinkedList 为基础，编写了 C# 版本的 deque
---
 codes/csharp/chapter_stack_and_queue/deque.cs | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 codes/csharp/chapter_stack_and_queue/deque.cs

diff --git a/codes/csharp/chapter_stack_and_queue/deque.cs b/codes/csharp/chapter_stack_and_queue/deque.cs
new file mode 100644
index 0000000000..b1360e2830
--- /dev/null
+++ b/codes/csharp/chapter_stack_and_queue/deque.cs
@@ -0,0 +1,48 @@
+/**
+ * File: deque.cs
+ * Created Time: 2022-12-30
+ * Author: moonache (microin1301@outlook.com)
+ */
+
+using NUnit.Framework;
+
+namespace hello_algo.chapter_stack_and_queue
+{
+    public class deque
+    {
+        [Test]
+        public void Test()
+        {
+            /* 初始化双向队列 */
+            LinkedList<int> deque = new LinkedList<int>();
+
+            /* 元素入队 */
+            deque.AddLast(2);   // 添加至队尾
+            deque.AddLast(5);
+            deque.AddLast(4);
+            deque.AddFirst(3);  // 添加至队首
+            deque.AddFirst(1);
+            Console.WriteLine("双向队列 deque = " + String.Join(",", deque.ToArray()));
+
+            /* 访问元素 */
+            int peekFirst = deque.First.Value;  // 队首元素
+            Console.WriteLine("队首元素 peekFirst = " + peekFirst);
+            int peekLast = deque.Last.Value;    // 队尾元素
+            Console.WriteLine("队尾元素 peekLast = " + peekLast);
+
+            /* 元素出队 */
+            deque.RemoveFirst();  // 队首元素出队
+            Console.WriteLine("队首元素出队后 deque = " + String.Join(",", deque.ToArray()));
+            deque.RemoveLast();   // 队尾元素出队
+            Console.WriteLine("队尾元素出队后 deque = " + String.Join(",", deque.ToArray()));
+
+            /* 获取双向队列的长度 */
+            int size = deque.Count;
+            Console.WriteLine("双向队列长度 size = " + size);
+
+            /* 判断双向队列是否为空 */
+            bool isEmpty = deque.Count == 0;
+            Console.WriteLine("双向队列是否为空 = " + isEmpty);
+        }
+    }
+}

From c67363a78e84148c1ae44b258d6ae3aa4bc4086a Mon Sep 17 00:00:00 2001
From: Yudong Jin <krahets@163.com>
Date: Fri, 30 Dec 2022 16:10:22 +0800
Subject: [PATCH 2/2] Update deque.cs

---
 codes/csharp/chapter_stack_and_queue/deque.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/codes/csharp/chapter_stack_and_queue/deque.cs b/codes/csharp/chapter_stack_and_queue/deque.cs
index b1360e2830..d9f7a50982 100644
--- a/codes/csharp/chapter_stack_and_queue/deque.cs
+++ b/codes/csharp/chapter_stack_and_queue/deque.cs
@@ -14,6 +14,7 @@ public class deque
         public void Test()
         {
             /* 初始化双向队列 */
+            // 在 C# 中，将链表 LinkedList 看作双向队列来使用
             LinkedList<int> deque = new LinkedList<int>();
 
             /* 元素入队 */