WCF数据服务中的自定义错误响应

Question

在我的DataService derrived类中，我已经覆盖了HandleException方法，以便进行自定义异常处理（简化示例）：

    protected override void HandleException(HandleExceptionArgs args)
    {
       args.Exception = new DataServiceException(
            args.ResponseStatusCode,
            "RecordAlreadyExist",
            "The record with the given ID already exists in the database",
            System.Globalization.CultureInfo.CurrentCulture.Name,
            null);

        base.HandleException(args);
    }

这会导致类似以下JSON响应：

    {
       "error": { 
             "code": "RecordAlreadyExist",
             "Message": {
                  "Language": "en-US",
                  "Message": "The record with the given ID already exists in the database"
             }
        }
     }

但我希望在错误响应中有一些额外的信息，如：

    {
       "error": { 
             "code": "RecordAlreadyExist",
             "Message": {
                  "Language": "en-US",
                  "Message": "The record with the given ID already exists in the database"
             },
             "RecordID": "1234"
        }
     }

我该怎么做？ DataServiceException仅支持错误代码和消息...