Programmatically specify a value within appsettings.json

Question

I am trying to set up a logging system that adds log files to subfolders based on the year. However I've been unable to programmatically specify the year. I can hardcode it and it works fine, but I would like to be able to specify it programmatically. When I do this, ASP.Net takes it as a literal value and either creates a folder based on that literal string, or it doesn't do anything because the string contains characters that can't exist (or can't start) a folder name, such as the example I'm showing below. Is there a way to do this or am I stuck with hardcoding?

"Serilog": 
{
    "MinimumLevel": 
    {
        "Default": "Debug",
        "Override": 
        {
            "Microsoft": "Information",
            "System": "Information"
        }
    },
    "WriteTo": 
    [
        {
            "Name": "Console",
            "Args": 
            {
            "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}"
            }
        },
        {
            "Name": "Logger","Args": 
            {
                "configureLogger": 
                    {
                        "WriteTo": 
                        [
                            {
                                "Name": "File",
                                "Args": 
                                {
                                    "path": "C:/data/Logs/ErrorLogs/{Date:yyyy}/errorlog_.log",
                                    "rollingInterval": "Day",
                                    "retainedFileCountLimit": null,
                                    "outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}"
                                }
                            }
                        ],
                        "Filter": 
                        [
                            {
                                "Name": "ByIncludingOnly",
                                "Args": 
                                {
                                    "expression": "(@Level = 'Error' or @Level = 'Fatal')"
                                }
                            }
                        ]
                    }
                }
            },

...

Which logger are you using? Serilog? Log4Net? Or something else? (This avoids needing to guess.) — Richard
– Richard, Commented Aug 12, 2024 at 17:54
@Richard - as the code shows above as well as my tag, Serilog. — L. Wallach
– L. Wallach, Commented Aug 12, 2024 at 18:02
You can can certainly do this in code (see readme). But nothing looks like the implementation treats the path from configuration as anything more than a plain string. — Richard
– Richard, Commented Aug 12, 2024 at 21:19

L. Wallach · Accepted Answer · 2024-08-13 20:27:47Z

After a bunch more research and testing I found a solution to this - instead of using appsettings.json, you can make similar configurations to Serilog sink files in your program.cs, so here is the one that I ended up that worked for me:

var currentYear = DateTime.Now.Year.ToString(); // Get the current year

Log.Logger = new LoggerConfiguration()
.ReadFrom.Configuration(builder.Configuration) // Read other settings from appsettings.json
.Enrich.FromLogContext()
.WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
.WriteTo.File($"C:/data/Logs/ErrorLogs/{currentYear}/errorlog_.log",

    rollingInterval: RollingInterval.Day,
    retainedFileCountLimit: null,
    outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}",

    restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Error)
// Filter for Error and Fatal
.WriteTo.File($"C:/data/Logs/ActivityLogs/{currentYear}/activitylog_.log",
    rollingInterval: RollingInterval.Day,
    retainedFileCountLimit: null,
    outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}")
    .Filter.ByExcluding(Matching.WithProperty<Serilog.Events.LogEventLevel>("Level",
                         level => level != Serilog.Events.LogEventLevel.Information)) // Filter for Information only
    .Filter.ByExcluding(le =>
        le.MessageTemplate.Text.Contains("The file ") || // More specific for "The File"
        le.RenderMessage().StartsWith("Request") || // Use RenderMessage for "Request" 
        le.MessageTemplate.Text.StartsWith("Executing") ||
        le.MessageTemplate.Text.StartsWith("Route") ||
        le.MessageTemplate.Text.StartsWith("Accessing") ||
        le.MessageTemplate.Text.StartsWith("Executed"))
.CreateLogger();

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