索引格式每天至每周更改

Question

我当前正在将日志从Nlog发送到ElasticSearch。我每天创建索引，并将日志发送到该索引。我想创建每周索引，所以我想更改配置文件。

我在NLog配置文件中创建索引。 index = "logstash-${date:format=yyyy.MM.dd}"

我的NLog配置部分：

  <target xsi:type="ElasticSearch" 
    index = "logstash-${date:format=yyyy.MM.dd}"
    uri="http://localhost:9200" 
    includeAllProperties ="true">
   </target>

我在一些论坛（https://github.com/logstash-plugins/logstash-output-
elasticsearch/issues/541#issuecomment-270923437
）中发现，我每周都应该使用xxxx.ww之类的内容。我试图像这样更改配置文件：
index = "logstash-${date:format=xxxx.ww}"

不幸的是，这是给我的结果logstash-xxxx.ww，我是预期的结果logstash-2019.25

那么我如何才能每天更改为每周一次？

Answer 1

${date}接受与相同的格式DateTime.ToString。不幸的是，.NET没有ww或weeknumber格式（请参阅自html" target="_blank">定义日期和时间格式字符串 -.NET |
Microsoft Docs
）

论坛上的链接谈论的是Joda Time，它是Java而不是.NET的库。

// This presumes that weeks start with Monday.
// Week 1 is the 1st week of the year with a Thursday in it.
public static int GetIso8601WeekOfYear(DateTime time)
{
    // Seriously cheat.  If its Monday, Tuesday or Wednesday, then it'll 
    // be the same week# as whatever Thursday, Friday or Saturday are,
    // and we always get those right
    DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(time);
    if (day >= DayOfWeek.Monday && day <= DayOfWeek.Wednesday)
    {
        time = time.AddDays(3);
    }

    // Return the week of our adjusted day
    return CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(time, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
}

创建一个渲染2019.25等的布局渲染器（请参阅NLog文档-
如何编写自定义布局渲染器）

using NLog.LayoutRenderers;
using NLog;
...

// register ${myDateTime}. Register a soon as possible (e.g main(), app_start etc)
LayoutRenderer.Register("myDateTime", logEventInfo => 
    logEventInfo.TimeStamp.Year +"." + GetIso8601WeekOfYear(logEventInfo.TimeStamp));

现在这应该工作：

index = "logstash-${myDateTime}"