如何在C＃.NET结构化日志记录中强制使用驼峰大小写？

Question

没有人知道如何将.NET Core C＃中的结构化日志记录的行为/格式更改为驼峰式（例如：camelCase）？我正在尝试利用结构化日志记录，如下所示：

Logger.LogInformation("Some text here. My object: {@some_class}", someClass);

假设某类如下所示：

class SomeClass {
  [JsonProperty(PropertyName = "intField")] // this does NOT work for structured logging
  int IntField {get;set;}
  string StrField {get;set;}
}

为了简洁起见，我将收到如下输出：

{
  ...
  "message": "Some text here. My object: {\"IntField\":5,\"StrField\":\"I'm here\"}",
  "some_class": {
    "IntField":5,
    "StrField":"I'm here"
  },
  ...
}

但是我想要的是将所有字段都设为驼峰式，就像日志中的所有父字段一样。以下是所需的结果：

{
  ...
  "message": "Some text here. My object: {\"IntField\":5,\"StrField\":\"I'm here\"}",
  "some_class": {
    "intField":5,
    "strField":"I'm here"
  },
  ...
}

我已经尝试使用新的JsonSerializerSettings对象设置我的JsonConvert.DefaultSettings以强制使用骆驼套，但是我假设只有在实际序列化为字符串（got this from StackOverflow question）时，此方法才有效。我猜测记录器并未在其中使用。

如果有帮助，我正在使用.NET Core 2.2和v4.8.1。

Answer 1

1]使用CamelCaseNamingStrategy作为NamingStrategy配置创建您的自定义序列化器。

    internal class JsonNetSerializer : NLog.IJsonConverter
    {
        private readonly DefaultContractResolver contractResolver;

        public JsonNetSerializer()
        {
            contractResolver = new DefaultContractResolver
            {
                // KEY CONFIG !!!
                NamingStrategy = new CamelCaseNamingStrategy()
            };
        }

        /// <summary>Serialization of an object into JSON format.</summary>
        /// <param name="value">The object to serialize to JSON.</param>
        /// <param name="builder">Output destination.</param>
        /// <returns>Serialize succeeded (true/false)</returns>
        public bool SerializeObject(object value, StringBuilder builder)
        {
            try
            {
                string json = JsonConvert.SerializeObject(value, new JsonSerializerSettings
                {
                    ContractResolver = contractResolver
                });

                builder.Append(json);
            }
            catch (Exception e)
            {
                NLog.Common.InternalLogger.Error(e, "Error when custom JSON serialization");
                return false;
            }
            return true;
        }
    }
}

2）更改默认值以使用新的自定义

var customConverter = new JsonNetSerializer();
ConfigurationItemFactory.Default.JsonConverter = customConverter;

使用它，将您的Json发送到NLoglog.Info("Metadata: {@source}", metadata);