Question

我正在寻找方法使RollingFlatFileTraceListenerData在使用JsonLogFormatter时创建一个有效的JSON文档。与XML解析器一样，RollingFlatFileTraceListenerData仅附加项目，只是为您提供添加项目页眉和页脚的选项，但不提供更高级别的文件页眉，页脚标题和项目分隔符。我意识到我可以在事后修改文件，但我宁愿使用有效格式构建流程。使用外部进程打开活动文件会有风险，因为如果需要打开文件再次登录，它可能会阻止日志记录过程。

当前输出：

{
  "Message": "Log entry created using the simplest overload.",
  "Categories": [
    "General"
  ],
  "Priority": -1,
  "EventId": 1,
  "Severity": 8,
  "LoggedSeverity": "Information",
  "Title": "",
  "TimeStamp": "2013-11-07T20:33:38.6537773Z",
  "MachineName": "Acme01",
  "AppDomainName": "Acme.TestDriver.vshost.exe",
  "ProcessId": "10348",
  "ProcessName": "C:\\dev\\Acme.TestDriver\\bin\\Debug\\Acme.TestDriver.vshost.exe",
  "ManagedThreadName": null,
  "Win32ThreadId": "11204",
  "ExtendedProperties": {},
  "TimeStampString": "11/7/2013 8:33:38 PM",
  "ActivityId": "00000000-0000-0000-0000-000000000000",
  "RelatedActivityId": null,
  "ErrorMessages": null,
  "ActivityIdString": "00000000-0000-0000-0000-000000000000",
  "CategoriesStrings": [
    "General"
  ]
}
{
  "Message": "Log entry with a single category.",
  "Categories": [
    "General"
  ],
  "Priority": -1,
  "EventId": 1,
  "Severity": 8,
  "LoggedSeverity": "Information",
  "Title": "",
  "TimeStamp": "2013-11-07T20:33:38.6537773Z",
  "MachineName": "Acme01",
  "AppDomainName": "Acme.TestDriver.vshost.exe",
  "ProcessId": "10348",
  "ProcessName": "C:\\dev\\Acme.TestDriver\\bin\\Debug\\Acme.TestDriver.vshost.exe",
  "ManagedThreadName": null,
  "Win32ThreadId": "11204",
  "ExtendedProperties": {},
  "TimeStampString": "11/7/2013 8:33:38 PM",
  "ActivityId": "00000000-0000-0000-0000-000000000000",
  "RelatedActivityId": null,
  "ErrorMessages": null,
  "ActivityIdString": "00000000-0000-0000-0000-000000000000",
  "CategoriesStrings": [
    "General"
  ]
}

优选：

[
 {
      "Message": "Log entry created using the simplest overload.",
      "Categories": [
        "General"
      ],
      "Priority": -1,
      "EventId": 1,
      "Severity": 8,
      "LoggedSeverity": "Information",
      "Title": "",
      "TimeStamp": "2013-11-07T20:33:38.6537773Z",
      "MachineName": "Acme01",
      "AppDomainName": "Acme.TestDriver.vshost.exe",
      "ProcessId": "10348",
      "ProcessName": "C:\\dev\\Acme.TestDriver\\bin\\Debug\\Acme.TestDriver.vshost.exe",
      "ManagedThreadName": null,
      "Win32ThreadId": "11204",
      "ExtendedProperties": {},
      "TimeStampString": "11/7/2013 8:33:38 PM",
      "ActivityId": "00000000-0000-0000-0000-000000000000",
      "RelatedActivityId": null,
      "ErrorMessages": null,
      "ActivityIdString": "00000000-0000-0000-0000-000000000000",
      "CategoriesStrings": [
        "General"
      ]
    }
,
    {
      "Message": "Log entry with a single category.",
      "Categories": [
        "General"
      ],
      "Priority": -1,
      "EventId": 1,
      "Severity": 8,
      "LoggedSeverity": "Information",
      "Title": "",
      "TimeStamp": "2013-11-07T20:33:38.6537773Z",
      "MachineName": "Acme01",
      "AppDomainName": "Acme.TestDriver.vshost.exe",
      "ProcessId": "10348",
      "ProcessName": "C:\\dev\\Acme.TestDriver\\bin\\Debug\\Acme.TestDriver.vshost.exe",
      "ManagedThreadName": null,
      "Win32ThreadId": "11204",
      "ExtendedProperties": {},
      "TimeStampString": "11/7/2013 8:33:38 PM",
      "ActivityId": "00000000-0000-0000-0000-000000000000",
      "RelatedActivityId": null,
      "ErrorMessages": null,
      "ActivityIdString": "00000000-0000-0000-0000-000000000000",
      "CategoriesStrings": [
        "General"
      ]
    }
]

Answer 1

开箱即用的跟踪侦听器只是附加到文件中。您将无法打开该文件并对其进行修改，因为该文件已被锁定。如果要创建格式良好的文档，则必须创建自定义跟踪侦听器，以创建开始标记并确保结束标记始终位于文件的底部。

Answer 2

我也试图纠正输出，但最终放弃并处理了消费方面的所有事情。下面是我的示例程序，该程序根据https://stackoverflow.com/a/26610684/4904200

中的代码对事件进行垃圾邮件然后尝试使用它们

关键点：

RollingFlatFileTraceListener页眉和页脚设置为“”
在使用日志时，我们的流设置为FileShare.ReadWrite，因此我们不会干扰编写
JsonReader.SupportMultipleContent = true让我们处理文件中的多个对象，只要它们位于不同的行上即可。

这使用Microsoft Enterprise Logging Library v6和Newtonsoft JSON v8。

static void Main(string[] args) {
  Thread producer = new Thread(new ThreadStart(Produce));
  Thread consumer = new Thread(new ThreadStart(Consume));
  producer.Start();
  consumer.Start();
  while (true)
    Thread.Sleep(1000);
}

public static void Produce() {
  RollingFlatFileTraceListener listener = new RollingFlatFileTraceListener(
    fileName: "jsontest",
    formatter: new JsonLogFormatter(),
    header: "",
    footer: "",
    rollSizeKB: 1024);
  LoggingConfiguration configuration = new LoggingConfiguration();
  configuration.Filters.Add(new CategoryFilter("Category Filter", new string[] { "none" }, CategoryFilterMode.AllowAllExceptDenied));
  configuration.AddLogSource("Any", SourceLevels.All, true, listener);
  LogWriter writer = new LogWriter(configuration);

  while (true)
    writer.Write(DateTime.Now);
}

public static void Consume() {
  while (true) {
    try {
      using (var fileStream = File.Open("jsontest", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
        LogEntry latestEntry = ReadJson<LogEntry>(fileStream).OrderBy(x => x.TimeStamp).FirstOrDefault();
        if (latestEntry == null)
          continue;
        Console.WriteLine("Consume\t" + latestEntry.Message);
      }
    } catch (FileNotFoundException) {
      Console.WriteLine("File Not Found");
    } catch (IOException) {
      Console.WriteLine("File Is Probably Busy");
    }
  }
}


public static IEnumerable<TResult> ReadJson<TResult>(Stream stream) {
  var serializer = new JsonSerializer();
  using (var reader = new StreamReader(stream))
  using (var jsonReader = new JsonTextReader(reader)) {
    jsonReader.SupportMultipleContent = true;
    while (jsonReader.Read()) {
      yield return serializer.Deserialize<TResult>(jsonReader);
    }
  }
}

企业库RollingFlatFileTraceListenerData JsonLogFormatter文件格式

2 个答案: