修复StringBuilder缺失引用问题

添加 using System.Text; 引用到Form1.cs以解决编译错误 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-24 15:45:15 +08:00 · 2025-11-24 15:45:15 +08:00 · 86d4e64839
commit 86d4e64839
parent 505715c05e
1 changed files with 1 additions and 0 deletions
--- a/Form1.cs
+++ b/Form1.cs
@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
 using System.Drawing;
 using System.Windows.Forms;