C#•9mo ago

❔ Serilog: how to write a file for single level

Hi guys! I've been asked to write log levels Information, Warning and Error in development, but each of them in one separated file, so that I have information.txt containing only Information logs, warning.txt containing only Warning logs, Error.txt containing only Error logs. This is my implementation at the moment (it works): In Program.cs:

public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
    .ConfigureWebHostDefaults(webBuilder =>
    {
        webBuilder.UseStartup<Startup>();
        webBuilder.UseSerilog((webHostBuilderContext, loggerConfiguration) =>
        {
            loggerConfiguration.ReadFrom.Configuration(webHostBuilderContext.Configuration);
        });
    });

public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
    .ConfigureWebHostDefaults(webBuilder =>
    {
        webBuilder.UseStartup<Startup>();
        webBuilder.UseSerilog((webHostBuilderContext, loggerConfiguration) =>
        {
            loggerConfiguration.ReadFrom.Configuration(webHostBuilderContext.Configuration);
        });
    });

in appsettings:

"Serilog": {
  "MinimumLevel": "Information",
  "WriteTo": [
    {
      "Name": "Console"
    },
    {
      "Name": "File",
      "Args": {
        "path": "wwwroot/Logs/log.txt",
        "rollingInterval": "Day",
        "reatinedFileCountLimit": 14,
        "restrictedToMinimumLevel": "Information"
      }
    }
  ]
},

"Serilog": {
  "MinimumLevel": "Information",
  "WriteTo": [
    {
      "Name": "Console"
    },
    {
      "Name": "File",
      "Args": {
        "path": "wwwroot/Logs/log.txt",
        "rollingInterval": "Day",
        "reatinedFileCountLimit": 14,
        "restrictedToMinimumLevel": "Information"
      }
    }
  ]
},

I have installed Serilog.Expressions package and read the docs, I know I have to use something like this

"Filters": [
  {
    "Name": "ByIncludingOnly",
    "Args": {
      "expression": "@l = 'Information'"
    }
  }
]

"Filters": [
  {
    "Name": "ByIncludingOnly",
    "Args": {
      "expression": "@l = 'Information'"
    }
  }
]

but I can't understand where it should be placed. I've tried placing it in Args or between Args and Name but it doesn't work, can somebody help me? 🥺

3 Replies

Pobiega•9mo ago

you can definately do it with filters, which is a serilog plugin ah, there was another section of the post 😄 Yeah, expression filters, thats what you need it should be something like

{
  "Serilog": {
    "MinimumLevel": "Information",
    "WriteTo": [
      {
        "Name": "Console"
      },
      {
        "Name": "File",
        "Args": {
          "path": "wwwroot/Logs/log.txt",
          "rollingInterval": "Day",
          "reatinedFileCountLimit": 14,
          "restrictedToMinimumLevel": "Information",
          "configureLogger": {
            "Filter": [
              {
                "Name": "ByIncludingOnly",
                "Args": {
                  "expression": "@l = 'Information'"
                }
              }
            ]
          }
        }
      }
    ]
  }
}

{
  "Serilog": {
    "MinimumLevel": "Information",
    "WriteTo": [
      {
        "Name": "Console"
      },
      {
        "Name": "File",
        "Args": {
          "path": "wwwroot/Logs/log.txt",
          "rollingInterval": "Day",
          "reatinedFileCountLimit": 14,
          "restrictedToMinimumLevel": "Information",
          "configureLogger": {
            "Filter": [
              {
                "Name": "ByIncludingOnly",
                "Args": {
                  "expression": "@l = 'Information'"
                }
              }
            ]
          }
        }
      }
    ]
  }
}

Ikinidae•9mo ago

I've tried in this exact way and it didn't work, I'm going crazy beacause it seems to be SO SIMPLE

Accord•9mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ Serilog: how to write a file for single level