[Question] Is it possible to use an ExpressionTemplate using config (appsettings.json)?

I’d like to write something like this in my appsettings.json:

{
  "Serilog": {
    "Using": [
      "Serilog.Expressions"
    ],
    "WriteTo": [
      {
        "Name": "Console",
        "Args": {
          "outputTemplate": "[{@t:HH:mm:ss} {@l:u3} ({SourceContext})] {@m} (first item is {Items[0]})\n{@x}"
        }
      }
    ]
  }
}

Obviously the outputTemplate doesn’t support expressions. Is there any way to accomplish this? Perhaps this question is better suited to the https://github.com/serilog/serilog-settings-configuration repo.

[thargy]

For anyone else finding this issue, this is actually possible and documented in serilog-settings-configuration, e.g.:

{
  "Name": "Console",
  "Args": {
    "formatter": {
      // `type` (or $type) is optional, must be specified for abstract declared parameter types
      "type": "Serilog.Templates.ExpressionTemplate, Serilog.Expressions",
      "template": "[{@t:HH:mm:ss} {@l:u3} {Coalesce(SourceContext, '<none>')}] {@m}\n{@x}"
  }
}

[skomis-mm]

Hi @sanghel-payoff , @rdewaele this is the correct config:

"WriteTo": [
      {
        "Name": "Console",
        "Args": {
          "formatter": {
            "type": "Serilog.Templates.ExpressionTemplate, Serilog.Expressions",
            "template": "{@t:HH:mm:ss} {@l:u3}\n",
            "theme": "Serilog.Templates.Themes.TemplateTheme::Code, Serilog.Expressions"
          }
        }
      }
    ]