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src/YhCore.Common/Exceptions/ErrorCodeUtil.cs

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+using Yh.Platform.Abstractions;
+
+namespace YhCore.Common.Exceptions
+{
+    /// <summary>int 错误码 → 新框架 <see cref="IErrorCode"/> 映射（对齐 Java ErrorCode 常量值）。</summary>
+    /// <remarks>
+    /// 用途：业务直接抛 <see cref="DException"/> 时，把数值错误码转成 IErrorCode：
+    /// <code>throw new DException(ErrorCodeUtil.From(5001), "库存不足");</code>
+    /// </remarks>
+    public static class ErrorCodeUtil
+    {
+        public const int Default = 1;
+
+        /// <summary>按数值映射平台已知错误码；未知码保留原值（避免业务自定义错误码被吞成 Error=1）。</summary>
+        public static IErrorCode From(int code) => code switch
+        {
+            0 => ErrorCode.Success,
+            2 => ErrorCode.ParamError,
+            3 => ErrorCode.Forbidden,
+            4 => ErrorCode.Unauthorized,
+            5 => ErrorCode.Custom,
+            6 => ErrorCode.InternalServerError,
+            405 => ErrorCode.HttpMethodNotAllowed,
+            _ => new RawErrorCode(code, ""),
+        };
+
+        /// <summary>未知码透传实现：保留调用方原始 code，msg 由业务消息承载。</summary>
+        private sealed record RawErrorCode(int Code, string Msg) : IErrorCode;
+    }
+}