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c#nlog
Denis535
Denis535

Reputation: 3590

NLog: How to use function (plain code) instead of layout string?

Specifying message format via declarative layout string is a easy way but only in simple cases.

When I see conditions or nested layouts I want to use plain code to format my message.

How can I format my messages via plain code?

Upvotes: 0

Views: 619

Answers (2)

Rolf Kristensen
Rolf Kristensen

Reputation: 19867

You can also create your own custom Layout-class:

class CustomLayout : Layout
{
    protected string GetFormattedMessage(LogEventInfo logEvent)
    {
         // Legacy-style
         return "King of the world";
    }

    protected override void RenderFormattedMessage(LogEventInfo logEvent, StringBuilder target)
    {
         // New style supports reusable StringBuilder (reduces allocation)
         target.Append(GetFormattedMessage(logEvent));
    }
}

Upvotes: 1

Rolf Kristensen
Rolf Kristensen

Reputation: 19867

You can always register your own custom layout renderer that generates whatever wonderful pattern you like:

LayoutRenderer.Register("king", (logEvent) => "King of the World");

Just make sure to register the layout before loading the NLog-config (or creating any NLog-Logger objects, including static Logger-objects).

Then you can use your custom-layoutrenderer in the Layout like normal (Ex. ${king})

See also: https://github.com/NLog/NLog/wiki/How-to-write-a-custom-layout-renderer

See also: https://nlog-project.org/documentation/v4.5.0/html/T_NLog_LogEventInfo.htm (Available logevent-properties)

Upvotes: 2

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