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Showing content from https://github.com/NLog/NLog/wiki/Cached-Layout-Renderer below:

Cached Layout Renderer · NLog/NLog Wiki · GitHub

Applies caching to another layout output.

Platforms Supported: All

${cached:cached=Boolean:clearCache=ClearCacheOption:inner=Layout:cacheKey=Layout}

or by using ambient property to modify output of other layout renderer:

• cached - Indicates whether this CachedLayoutRendererWrapper is enabled. Boolean Default: True
• clearCache - Indicates when the cache is cleared. Possible options: None, OnInit, Onclose. ClearCacheOption Default: OnInit, OnClose.

  Introduced in NLog 4.2.

• cacheKey - the layout to be checked if the cache is still valid. For example, the current day. Default: null.

  Introduced in NLog 4.3.9

• cachedSeconds - Cached value will expire after timeout. Default: infinite

  Introduced in NLog 4.6.8

• inner - Wrapped layout. Layout

• ${cached:cached=true:clearCache=OnInit,OnClose:inner=l}: The value of l is cached and the cache will be cleared when the layout renderer is initialized or when it is closed. This is the same as ${cached:cached=true:inner=l}.
• ${cached:cached=true:clearCache=None:inner=l}: The value of l is cached and the cache will not be cleared.
• filename="${cached:cached=true:Inner=${date:format=yyyy-MM-dd hh.mm.ss}:CacheKey=${shortdate}}.log" - Use the first logtime and day in the file name, only one file per day.

The value of the inner layout will be rendered only once and reused subsequently.

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