From 633cb549fb21c4f45a366a973dcc30768a97a03f Mon Sep 17 00:00:00 2001
From: Javie Deng <javiedeng@foxmail.com>
Date: Mon, 20 Mar 2023 12:36:06 +0800
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---
 problems/0226.翻转二叉树.md | 47 ++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/problems/0226.翻转二叉树.md b/problems/0226.翻转二叉树.md
index 16a5be57..611e971a 100644
--- a/problems/0226.翻转二叉树.md
+++ b/problems/0226.翻转二叉树.md
@@ -914,6 +914,53 @@ impl Solution {
 }
 ```
 
+### C#
+
+```csharp
+//递归
+public class Solution {
+    public TreeNode InvertTree(TreeNode root) {
+    if (root == null) return root;
+    
+    swap(root);
+    InvertTree(root.left);
+    InvertTree(root.right);
+    return root;
+    }
+   
+  public void swap(TreeNode node) {
+        TreeNode temp = node.left;
+        node.left = node.right;
+        node.right = temp;
+    }
+}
+```
+
+```csharp
+//迭代
+public class Solution {
+    public TreeNode InvertTree(TreeNode root) {
+          if (root == null) return null;
+        Stack<TreeNode> stack=new Stack<TreeNode>();
+        stack.Push(root);
+        while(stack.Count>0)
+        {
+            TreeNode node = stack.Pop();   
+            swap(node);
+            if(node.right!=null) stack.Push(node.right);   
+            if(node.left!=null) stack.Push(node.left);     
+        }
+        return root;
+    }
+
+     public void swap(TreeNode node) {
+        TreeNode temp = node.left;
+        node.left = node.right;
+        node.right = temp;
+    }
+}
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>