A:全局Common的公共定义

Common/AppConfig.cs

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+using Common.Configuration;
+
+namespace Common;
+
+public sealed class AppConfig
+{
+    // 使用 Lazy<T> 实现线程安全的懒加载单例
+    private static readonly Lazy<AppConfig> _instance = new Lazy<AppConfig>(() => new AppConfig());
+
+    // 提供全局访问点
+    public static AppConfig Instance => _instance.Value;
+
+    // 私有构造函数，防止外部实例化
+    private AppConfig()
+    {
+        var model = ConfigReader.LoadConfig();
+        AppName = model.AppName ?? "MyApp";
+        Version = model.Version ?? "1.0.0";
+        MaxConnection = model.MaxConnection > 0 ? model.MaxConnection : 10;
+
+        // 初始化配置（可以从文件或环境变量读取）
+        AppName = "MyApp";
+        Version = "1.0.0";
+        MaxConnection = 10;
+    }
+
+    // 配置项：只读属性
+    public string AppName { get; }
+    public string Version { get; }
+    public int MaxConnection { get; }
+
+    // 可扩展其他读取配置的方法
+}

Common/Class1.cs

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+namespace Common;
+
+public class Class1
+{
+}

Common/Common.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Extensions.Configuration" Version="10.0.0-preview.4.25258.110" />
+      <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="10.0.0-preview.4.25258.110" />
+      <PackageReference Include="Serilog.Settings.Configuration" Version="9.0.1-dev-02317" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <Folder Include="Logger\" />
+    </ItemGroup>
+
+</Project>

Common/Configuration/ConfigLoader.cs

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+using Microsoft.Extensions.Configuration;
+
+namespace Common.Configuration;
+
+public static class ConfigLoader
+{
+    private static readonly object _lock = new();
+    private static AppConfig _config;
+
+    public static AppConfig Config
+    {
+        get
+        {
+            if (_config == null)
+            {
+                lock (_lock)
+                {
+                    if (_config == null)
+                    {
+                        var builder = new ConfigurationBuilder()
+                            .SetBasePath(AppContext.BaseDirectory)
+                            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
+
+                        IConfiguration configuration = builder.Build();
+
+                        // _config = new AppConfig();
+                        configuration.GetSection("AppSettings").Bind(_config);
+                    }
+                }
+            }
+            return _config;
+        }
+    }
+}

Common/Configuration/ConfigReader.cs

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+using Microsoft.Extensions.Configuration;
+
+namespace Common.Configuration;
+
+public static class ConfigReader
+{
+    public static AppConfigModel LoadConfig()
+    {
+        var env = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT") ?? "Production";
+        var builder = new ConfigurationBuilder()
+            .SetBasePath(AppContext.BaseDirectory)
+            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+            .AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: true);
+
+        IConfiguration config = builder.Build();
+
+        var model = new AppConfigModel();
+        config.GetSection("AppSettings").Bind(model);
+        return model;
+    }
+}
+
+// 可单独定义模型类用于绑定
+public class AppConfigModel
+{
+    public string AppName { get; set; }
+    public string Version { get; set; }
+    public int MaxConnection { get; set; }
+}

Common/ExceptionExpand.cs

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+namespace Common;
+
+public class ExceptionExpand : Exception
+{
+    /// <summary>
+    /// 默认异常编码
+    /// </summary>
+    private const long DefaultCode = -1;
+
+    public string ErrorMessage { get; private set; } = "";
+    public long ErrorCode { get; private set; } = DefaultCode;
+    public string Suggestion { get; private set; } = "";
+
+    private ExceptionExpand()
+    {
+    }
+
+    public ExceptionExpand(long errorCode, string massage, string solution) : base(
+        massage)
+    {
+        ErrorCode = errorCode;
+        Suggestion = solution;
+    }
+
+    public ExceptionExpand(long errorCode, string massage, string solution, Exception? innerException) : base(
+        massage, innerException)
+    {
+        ErrorCode = errorCode;
+        Suggestion = solution;
+    }
+
+    public override string ToString()
+    {
+        return $"Error Code: {ErrorCode}\nMessage: {Message}\nSuggestion: {Suggestion}\n{base.ToString()}";
+    }
+}
+
+public class ExceptionEnum
+{
+    // region 系统常见错误本地化
+
+    /// <summary>
+    ///     进程信息获取失败
+    /// </summary>
+    public static readonly ExceptionExpand ProcessGetException = new(100001L, "进程消息获取失败,指定线程可能不存在或已关闭!", "以管理员权限重试!");
+    
+    
+    // endregion
+}

Common/Monitors/ApplicationHealthMonitor.cs

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+using System.Diagnostics;
+
+namespace Common.Monitors;
+
+public class ApplicationHealthMonitor
+{
+    private readonly Timer _healthCheckTimer;
+    
+    public ApplicationHealthMonitor()
+    {
+        _healthCheckTimer = new Timer(CheckApplicationHealth, null, 
+            TimeSpan.FromMinutes(1), TimeSpan.FromMinutes(5));
+    }
+    
+    private void CheckApplicationHealth(object state)
+    {
+        try
+        {
+            // 检查内存使用
+            var memoryUsage = GC.GetTotalMemory(false);
+            if (memoryUsage > 500 * 1024 * 1024) // 500MB
+            {
+                // Logger.Warn($"内存使用过高: {memoryUsage / 1024 / 1024}MB");
+                GC.Collect(); // 强制垃圾回收
+            }
+            
+            // 检查线程数量
+            var threadCount = Process.GetCurrentProcess().Threads.Count;
+            if (threadCount > 100)
+            {
+                // Logger.Warn($"线程数量过多: {threadCount}");
+            }
+        }
+        catch (Exception ex)
+        {
+            // LogException(ex, "健康检查异常");
+        }
+    }
+}

Common/TODO.md

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+| 类别       | 示例                                            |
+| -------- | --------------------------------------------- |
+| ✅ 配置封装   | `AppConfig`, `ConfigReader`                   |
+| ✅ 通用工具类  | 字符串处理、加密、哈希、路径处理                              |
+| ✅ 基础模型类  | `Result<T>`, `PagedList<T>`, `ErrorInfo`      |
+| ✅ 日志适配器  | 封装 `Serilog`、`NLog` 的通用调用接口                   |
+| ✅ 通用扩展方法 | `string.ToSafeInt()`, `DateTime.ToUnixTime()` |
+| ✅ 接口定义   | 如 `INetworkMonitor`, `ILogger`（便于依赖注入）        |
+| ✅ 网络协议模型 | 公共 API 的数据结构定义（DTO/VO）                        |
+| ✅ 常量/枚举  | 错误码、状态码、常量定义                                  |

Common/Utils/SysHelper.cs

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+using System.Net;
+using System.Net.Sockets;
+
+namespace Application.Utils;
+
+/// <summary>
+/// 
+/// </summary>
+public static class SysHelper
+{
+    /// <summary>
+    /// 获取可用端口
+    /// </summary>
+    /// <returns></returns>
+    public static int GetAvailablePort()
+    {
+        TcpListener listener = new TcpListener(IPAddress.Loopback, 0); // 端口号为0表示由系统自动分配
+        listener.Start();
+        int port = ((IPEndPoint)listener.LocalEndpoint).Port;
+        listener.Stop();
+        return port;
+    }
+}