From 6316fff080e11124c6d56d45f931207cb0bfd9d4 Mon Sep 17 00:00:00 2001
From: eeee0717 <70054568+eeee0717@users.noreply.github.com>
Date: Tue, 7 Nov 2023 09:13:15 +0800
Subject: [PATCH] =?UTF-8?q?Update=20707.=E8=AE=BE=E8=AE=A1=E9=93=BE?=
 =?UTF-8?q?=E8=A1=A8=EF=BC=8C=E6=B7=BB=E5=8A=A0C#=E7=89=88?=
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---
 problems/0707.设计链表.md | 71 +++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/problems/0707.设计链表.md b/problems/0707.设计链表.md
index c27f0107..a08227d9 100644
--- a/problems/0707.设计链表.md
+++ b/problems/0707.设计链表.md
@@ -1485,6 +1485,77 @@ impl MyLinkedList {
 }
 ```
 
+### C#
+```C#
+class ListNode
+{
+    public int val;
+    public ListNode next;
+    public ListNode(int val) { this.val = val; }
+}
+public class MyLinkedList
+{
+    ListNode dummyHead;
+    int count;
+
+    public MyLinkedList()
+    {
+        dummyHead = new ListNode(0);
+        count = 0;
+    }
+
+    public int Get(int index)
+    {
+        if (index < 0 || count <= index) return -1;
+        ListNode current = dummyHead;
+        for (int i = 0; i <= index; i++)
+        {
+            current = current.next;
+        }
+        return current.val;
+    }
+
+    public void AddAtHead(int val)
+    {
+        AddAtIndex(0, val);
+    }
+
+    public void AddAtTail(int val)
+    {
+        AddAtIndex(count, val);
+    }
+
+    public void AddAtIndex(int index, int val)
+    {
+        if (index > count) return;
+        index = Math.Max(0, index);
+        count++;
+        ListNode tmp1 = dummyHead;
+        for (int i = 0; i < index; i++)
+        {
+            tmp1 = tmp1.next;
+        }
+        ListNode tmp2 = new ListNode(val);
+        tmp2.next = tmp1.next;
+        tmp1.next = tmp2;
+    }
+
+    public void DeleteAtIndex(int index)
+    {
+
+        if (index >= count || index < 0) return;
+        var tmp1 = dummyHead;
+        for (int i = 0; i < index; i++)
+        {
+            tmp1 = tmp1.next;
+        }
+        tmp1.next = tmp1.next.next;
+        count--;
+
+    }
+}
+```
+
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