Is it possible to change colors in serilog?

Question

I have just integrated Serilog in my dot net core project. It is working really well but I use a dark theme and some logs are really dificult to read. As an example:

This is how I init Serilog:

string environment =  Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
        
LoggerConfiguration loggerConfig = new LoggerConfiguration();
            
if (environment == "Production")
    loggerConfig.MinimumLevel.Information();
                
loggerConfig.MinimumLevel.Override("Microsoft.AspNetCore",
    LogEventLevel.Warning) 
    .Enrich.FromLogContext()
    .WriteTo.Console()
    .WriteTo.File("Logs/app.log");

Is there any way I could change colors to make that black logs white for example?

Answer 1

Yes, the way to change colors when using the Console sink is through themes. You can try one of the built-in ones, or create your own.

The Console sink will colorize output by default:

Themes can be specified when configuring the sink:

    .WriteTo.Console(theme: AnsiConsoleTheme.Code)

The following built-in themes are available as of this writing:

• ConsoleTheme.None - no styling
• SystemConsoleTheme.Literate - styled to replicate Serilog.Sinks.Literate, using the System.Console coloring modes supported on all Windows/.NET targets; this is the default when no theme is specified
• SystemConsoleTheme.Grayscale - a theme using only shades of gray, white, and black
• AnsiConsoleTheme.Literate - an ANSI 16-color version of the "literate" theme; we expect to update this to use 256-colors for a more refined look in future
• AnsiConsoleTheme.Grayscale - an ANSI 256-color version of the "grayscale" theme
• AnsiConsoleTheme.Code - an ANSI 256-color Visual Studio Code-inspired theme

Adding a new theme is straightforward; examples can be found in the SystemConsoleThemes and AnsiConsoleThemes classes.