实现下载列表中版本的功能

Tools/VersionManager.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace MCSJ.Tools
+{
+    public class VersionManager
+    {
+        private readonly Dictionary<string, string> _versions = new();
+
+        public VersionManager()
+        {
+            LoadVersions();
+        }
+
+        private void LoadVersions()
+        {
+            try
+            {
+                var filePath = Path.Combine("resources", "serverlist.txt");
+                Console.WriteLine($"尝试从路径加载版本列表: {Path.GetFullPath(filePath)}");
+                
+                if (!File.Exists(filePath))
+                {
+                    throw new FileNotFoundException($"服务器列表文件不存在: {filePath}");
+                }
+
+                var content = File.ReadAllText(filePath);
+                var entries = content.Split(new[] {' ', '\n', '\r'}, StringSplitOptions.RemoveEmptyEntries);
+                
+                foreach (var entry in entries)
+                {
+                    var colonIndex = entry.IndexOf(':');
+                    if (colonIndex > 0 && colonIndex < entry.Length - 1)
+                    {
+                        var version = entry.Substring(0, colonIndex);
+                        var url = entry.Substring(colonIndex + 1);
+                        _versions[version] = url;
+                    }
+                    else
+                    {
+                        Console.WriteLine($"忽略无效条目: {entry} (缺少冒号分隔或格式不正确)");
+                    }
+                }
+                
+                if (_versions.Count == 0)
+                {
+                    throw new Exception("没有找到有效的版本条目");
+                }
+                
+                Console.WriteLine($"成功加载 {_versions.Count} 个版本");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"加载版本列表失败: {ex.Message}");
+                Console.WriteLine($"当前工作目录: {Directory.GetCurrentDirectory()}");
+                Console.WriteLine("请确保serverlist.txt格式为: 版本名:下载URL (每行一个或空格分隔)");
+            }
+        }
+
+        public void DisplayAllVersions()
+        {
+            Console.WriteLine("可用版本列表:");
+            foreach (var version in _versions.Keys)
+            {
+                Console.WriteLine(version);
+            }
+        }
+
+        public string GetDownloadUrl(string version)
+        {
+            return _versions.TryGetValue(version, out var url) ? url : null;
+        }
+    }
+}